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Melanoma Treatment (PDQ®)–Health Professional Version

General Information About Melanoma

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Melanoma is a malignant tumor of melanocytes, which are the cells that make the pigment melanin and are derived from the neural crest. Although most melanomas arise in the skin, they may also arise from mucosal surfaces or at other sites to which neural crest cells migrate, including the uveal tract. Uveal melanomas differ significantly from cutaneous melanoma in incidence, prognostic factors, molecular characteristics, and treatment. For more information, see Intraocular (Uveal) Melanoma Treatment.

Incidence and Mortality

Estimated new cases and deaths from melanoma in the United States in 2024:[1]

  • New cases: 100,640.
  • Deaths: 8,290.

Skin cancer is the most common malignancy diagnosed in the United States, and invasive melanoma represents about 1% of skin cancers but results in the most deaths.[1,2] Since the early 2000s, the incidence of melanoma in people younger than 50 years declined by about 1% per year in men and stabilized in women. In people aged 50 years and older, incidence stabilized in men and increased by about 3% per year in women.[1] Older men are at highest risk; however, melanoma is the most common cancer in young adults aged 25 to 29 years and the second most common cancer in those aged 15 to 29 years.[3] Ocular melanoma is the most common cancer of the eye, with approximately 2,000 cases diagnosed annually.

Risk Factors

Risk factors for melanoma include both intrinsic (genetic and phenotype) and extrinsic (environmental or exposure) factors:

  • Sun exposure.
  • Pigmentary characteristics.
  • Multiple nevi.
  • Family and personal history of melanoma.
  • Immunosuppression.
  • Environmental exposures.

For more information about risk factors, see Skin Cancer Prevention and Genetics of Skin Cancer.

Anatomy

EnlargeSchematic representation of normal skin; drawing shows normal skin anatomy, including the epidermis, dermis, hair follicles, sweat glands, hair shafts, veins, arteries, fatty tissue, nerves, lymph vessels, oil glands, and subcutaneous tissue. The pullout shows a close-up of the squamous cell and basal cell layers of the epidermis, the basement membrane in between the epidermis and dermis, and the dermis with blood vessels. Melanin is shown in the cells. A melanocyte is shown in the layer of basal cells at the deepest part of the epidermis.
Schematic representation of normal skin. Melanocytes are also present in normal skin and serve as the source cell for melanoma. The relatively avascular epidermis houses both basal cell keratinocytes and squamous epithelial keratinocytes, the source cells for basal cell carcinoma and squamous cell carcinoma, respectively. The separation between epidermis and dermis occurs at the basement membrane zone, located just inferior to the basal cell keratinocytes.

Screening

For more information, see Skin Cancer Screening.

Clinical Features

Melanoma occurs predominantly in adults, and more than 50% of the cases arise in apparently normal areas of the skin. Although melanoma can occur anywhere, including on mucosal surfaces and the uvea, in women it occurs more commonly on the extremities, and in men it occurs most commonly on the trunk or head and neck.[4]

Early signs in a nevus that would suggest a malignant change include the following:

  • Darker or variable discoloration.
  • Itching.
  • An increase in size or the development of satellites.
  • Ulceration or bleeding (later signs).
EnlargePhotographs showing a large, asymmetrical, red and brown lesion on the skin (panel 1); a brown lesion with a large and irregular border on the skin (panel 2); and a large, asymmetrical, scaly, red and brown lesion on the skin (panel 3).
Melanomas with characteristic asymmetry, border irregularity, color variation, and large diameter.

Diagnosis

A biopsy, preferably by local excision, should be performed for any suspicious lesions. Suspicious lesions should never be shaved off or cauterized. An experienced pathologist should examine the specimens to allow for microstaging.

Studies show that distinguishing between benign pigmented lesions and early melanomas can be difficult, and even experienced dermatopathologists can have differing opinions. To reduce the possibility of misdiagnosis for an individual patient, a second review by an independent qualified pathologist should be considered.[5,6] Agreement between pathologists in the histological diagnosis of melanomas and benign pigmented lesions has been found to be considerably variable.[5,6]

Evidence (discordance in histological evaluation):

  1. One study found that there was discordance in the diagnosis of melanoma versus benign lesions in 37 of 140 cases examined by a panel of experienced dermatopathologists. For the histological classification of cutaneous melanoma, the highest concordance was attained for Breslow thickness and presence of ulceration, while the agreement was poor for other histological features such as Clark level of invasion, presence of regression, and lymphocytic infiltration.[5]
  2. In another study, 38% of cases examined by a panel of expert pathologists had two or more discordant interpretations.[6]

Prognostic Factors

Prognosis is affected by the characteristics of primary and metastatic tumors. The most important prognostic factors have been incorporated into the revised 2009 American Joint Committee on Cancer staging and include the following:[4,7-9]

  • Thickness and/or level of invasion of the melanoma.
  • Mitotic index, defined as mitoses per millimeter.
  • Ulceration or bleeding at the primary site.
  • Number of regional lymph nodes involved, with distinction of macrometastasis and micrometastasis.
  • Systemic metastasis.
    • Site—nonvisceral versus lung versus all other visceral sites.
    • Elevated serum lactate dehydrogenase level.

Patients who are younger, who are female, and who have melanomas on their extremities generally have better prognoses.[4,7-9]

Microscopic satellites, recorded as present or absent, in stage I melanoma may be a poor prognostic histological factor, but this is controversial.[10] The presence of tumor infiltrating lymphocytes, which may be categorized as brisk, nonbrisk, or absent, is under study as a potential prognostic factor.[11]

The risk of relapse decreases substantially over time, although late relapses are not uncommon.[12,13]

References
  1. American Cancer Society: Cancer Facts and Figures 2024. American Cancer Society, 2024. Available online. Last accessed June 21, 2024.
  2. Melanoma. Bethesda, Md: National Library of Medicine, 2012. Available online. Last accessed April 16, 2024.
  3. Bleyer A, O’Leary M, Barr R, et al., eds.: Cancer Epidemiology in Older Adolescents and Young Adults 15 to 29 Years of Age, Including SEER Incidence and Survival: 1975-2000. National Cancer Institute, 2006. NIH Pub. No. 06-5767. Available online. Last accessed April 16, 2024.
  4. Slingluff CI Jr, Flaherty K, Rosenberg SA, et al.: Cutaneous melanoma. In: DeVita VT Jr, Lawrence TS, Rosenberg SA: Cancer: Principles and Practice of Oncology. 9th ed. Lippincott Williams & Wilkins, 2011, pp 1643-91.
  5. Corona R, Mele A, Amini M, et al.: Interobserver variability on the histopathologic diagnosis of cutaneous melanoma and other pigmented skin lesions. J Clin Oncol 14 (4): 1218-23, 1996. [PUBMED Abstract]
  6. Farmer ER, Gonin R, Hanna MP: Discordance in the histopathologic diagnosis of melanoma and melanocytic nevi between expert pathologists. Hum Pathol 27 (6): 528-31, 1996. [PUBMED Abstract]
  7. Balch CM, Soong S, Ross MI, et al.: Long-term results of a multi-institutional randomized trial comparing prognostic factors and surgical results for intermediate thickness melanomas (1.0 to 4.0 mm). Intergroup Melanoma Surgical Trial. Ann Surg Oncol 7 (2): 87-97, 2000. [PUBMED Abstract]
  8. Manola J, Atkins M, Ibrahim J, et al.: Prognostic factors in metastatic melanoma: a pooled analysis of Eastern Cooperative Oncology Group trials. J Clin Oncol 18 (22): 3782-93, 2000. [PUBMED Abstract]
  9. Balch CM, Gershenwald JE, Soong SJ, et al.: Final version of 2009 AJCC melanoma staging and classification. J Clin Oncol 27 (36): 6199-206, 2009. [PUBMED Abstract]
  10. León P, Daly JM, Synnestvedt M, et al.: The prognostic implications of microscopic satellites in patients with clinical stage I melanoma. Arch Surg 126 (12): 1461-8, 1991. [PUBMED Abstract]
  11. Mihm MC, Clemente CG, Cascinelli N: Tumor infiltrating lymphocytes in lymph node melanoma metastases: a histopathologic prognostic indicator and an expression of local immune response. Lab Invest 74 (1): 43-7, 1996. [PUBMED Abstract]
  12. Shen P, Guenther JM, Wanek LA, et al.: Can elective lymph node dissection decrease the frequency and mortality rate of late melanoma recurrences? Ann Surg Oncol 7 (2): 114-9, 2000. [PUBMED Abstract]
  13. Tsao H, Cosimi AB, Sober AJ: Ultra-late recurrence (15 years or longer) of cutaneous melanoma. Cancer 79 (12): 2361-70, 1997. [PUBMED Abstract]

Cellular and Molecular Classification of Melanoma

The descriptive terms for clinicopathological cellular subtypes of malignant melanoma should be considered of historic interest only; they do not have independent prognostic or therapeutic significance. The cellular subtypes are the following:

  • Superficial spreading.
  • Nodular.
  • Lentigo maligna.
  • Acral lentiginous (palmar/plantar and subungual).
  • Miscellaneous unusual types:
    • Mucosal lentiginous (oral and genital).
    • Desmoplastic.
    • Verrucous.

Genomic Classification

Cutaneous melanoma

The Cancer Genome Atlas (TCGA) Network performed an integrative multiplatform characterization of 333 cutaneous melanomas from 331 patients.[1] Using six types of molecular analysis at the DNA, RNA, and protein levels, the researchers identified four major genomic subtypes:

  • BRAF mutant.
  • RAS mutant.
  • NF1 mutant.
  • Triple wild-type.

Genomic subtypes may suggest drug targets and clinical trial design, as well as guide clinical decision-making for targeted therapies. For more information, see Table 1.

To date, targeted therapies have demonstrated efficacy and received U.S. Food and Drug Administration approval only for the BRAF-mutant subtype of melanoma. Combination therapies with a BRAF plus a MEK inhibitor have shown improvement in outcomes over a single-agent inhibitor alone; yet, virtually all patients acquire resistance to therapy and relapse. Therefore, clinical trials remain an important option for patients with BRAF-mutant subtype, as well as other genomic subtypes of melanoma. See the individual treatment sections for more information.

A variety of immunotherapies have been approved for the treatment of melanoma regardless of genetic subtype. The benefit of immunotherapy has not been associated with a specific mutation or molecular subtype. The TCGA analysis identified immune markers (in a subset within each molecular subtype) that were associated with improved survival and that may have implications for immunotherapy. Identification of predictive biomarkers remains an active area of research. See the individual treatment sections for more information.

Table 1. Multiplatform Analysis: Mutation, Copy Number, Whole Genome, miRNA/RNA Expression, Protein Expression in Cutaneous Melanomaa
Genomic Subtype% Samples With MutationIncreased Lymphocytic Infiltration (%)Clinical Management Implications for Targeted Therapyc,d
FDA = U.S. Food and Drug Administration; WT = wild-type.
aPrimary melanoma with matched normal samples; N = 67 (20%). Metastatic melanoma with matched normal samples; N = 266 (80%). Matched is defined as sample from the same patient.
bTriple WT was defined as a heterogeneous subgroup lacking BRAF, NRAS, HRAS, and KRAS, and NF1 mutations.
cThe indications for immunotherapy are not known to be determined or limited by genomic subtype.
dRisks and benefits of single versus combination therapies are detailed in the Treatment Option Overview for Melanoma section of this summary.
eResearch includes but is not limited to these examples. Clinical trials are posted on clinicaltrials.gov.
fIndicated when mutation is diagnosed by an FDA-approved assay.
   FDA ApprovedResearche (single agent or in combination)
BRAF mutant52~ 30 BRAF inhibitorsfCDK inhibitors, PI3K/Akt/mTOR inhibitors, ERK inhibitors, IDH1 inhibitors, EZH2 inhibitors, Aurora kinase inhibitors, ARID2 chromatin remodelers
   – Vemurafenib
–Dabrafenib
MEK inhibitors
–Trametinib
–Cobimetinib
Combination of BRAF + MEK inhibitors
–Vemurafenib + cobimetinib
–Dabrafenib + trametinib
RAS mutant (NRAS, HRAS, and KRAS )28~ 25 MEK inhibitors, CDK inhibitors, PI3K/Akt/mTOR inhibitors, ERK inhibitors, IDH1 inhibitors, EZH2 inhibitors, Aurora kinase inhibitors, ARID2 chromatin remodelers
NF1 mutant14~ 25 PI3K/Akt/mTOR inhibitors, ERK inhibitors, IDH1 inhibitors, EZH2 inhibitors, ARID2 chromatin remodelers
Triple WTb14.5~ 40  KIT-mutated/amplified CDK inhibitors (i.e., imatinib and dasatinib), MDM2/p53 interaction inhibitors, PI3K/Akt/mTOR inhibitors, IDH1 inhibitors, EZH2 inhibitors

Uveal melanoma

Uveal melanomas differ significantly from cutaneous melanomas. ln one series, 83% of 186 uveal melanomas were found to have a constitutively active somatic mutation in GNAQ or GNA11.[2,3] For more information, see Intraocular (Uveal) Melanoma Treatment.

References
  1. Cancer Genome Atlas Network: Genomic Classification of Cutaneous Melanoma. Cell 161 (7): 1681-96, 2015. [PUBMED Abstract]
  2. Van Raamsdonk CD, Bezrookove V, Green G, et al.: Frequent somatic mutations of GNAQ in uveal melanoma and blue naevi. Nature 457 (7229): 599-602, 2009. [PUBMED Abstract]
  3. Van Raamsdonk CD, Griewank KG, Crosby MB, et al.: Mutations in GNA11 in uveal melanoma. N Engl J Med 363 (23): 2191-9, 2010. [PUBMED Abstract]

Stage Information for Melanoma

Clinical staging is based on whether the tumor has spread to regional lymph nodes or distant sites. For melanoma that is clinically confined to the primary site, the chance of lymph node or systemic metastases increases as the thickness and depth of local invasion increases, which worsens the prognosis. Melanoma can spread by local extension (through lymphatics) and/or by hematogenous routes to distant sites. Any organ may be involved by metastases, but the lungs and liver are common sites.

The microstage of malignant melanoma is determined on histological examination by the vertical thickness of the lesion in millimeters (Breslow classification) and/or the anatomical level of local invasion (Clark classification). The Breslow thickness is more reproducible and more accurately predicts subsequent behavior of malignant melanoma in lesions thicker than 1.5 mm and should always be reported.

Accurate microstaging of the primary tumor requires careful histological evaluation of the entire specimen by an experienced pathologist.

Clark Classification (Level of Invasion)

Table 2. Clark Classification (Level of Invasion)
Level of Invasion Description
Level ILesions involving only the epidermis (in situ melanoma); not an invasive lesion.
Level IIInvasion of the papillary dermis; does not reach the papillary-reticular dermal interface.
Level IIIInvasion fills and expands the papillary dermis but does not penetrate the reticular dermis.
Level IVInvasion into the reticular dermis but not into the subcutaneous tissue.
Level VInvasion through the reticular dermis into the subcutaneous tissue.

AJCC Stage Groupings and TNM Definitions

The American Joint Committee on Cancer (AJCC) has designated staging by TNM (tumor, node, metastasis) classification to define melanoma.[1]

Cancers staged using this staging system include cutaneous melanoma. Cancers not staged using this system include melanoma of the conjunctiva; melanoma of the uvea; mucosal melanoma arising in the head and neck; mucosal melanoma of the urethra, vagina, rectum, and anus; Merkel cell carcinoma; and squamous cell carcinoma.[1]

AJCC Prognostic Stage Groups-Clinical (cTNM)

Table 3. Definition of cTNM Stage 0a
StageTNMT Category (Thickness/Ulceration Status)N Category (No. of Tumor-Involved Regional Lymph Nodes/Presence of In-Transit, Satellite, and/or Microsatellite Metastases)M Category (Anatomic Site/LDH Level)
T = primary tumor; N = regional lymph node; M = distant metastasis; c = clinical; LDH = lactate dehydrogenase; No. = number.
aAdapted from AJCC: Melanoma of the Skin. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp. 563–85.
bThickness and ulceration status not applicable.
0Tis, N0, M0Tis = Melanoma in situ.b N0 = No regional metastases detected. M0 = No evidence of distant metastasis.
Table 4. Definition of cTNM Stages IA and IBa
StageTNMT Category (Thickness/Ulceration Status)N Category (No. of Tumor-Involved Regional Lymph Nodes/Presence of In-Transit, Satellite, and/or Microsatellite Metastases)M Category (Anatomic Site/LDH Level)
T = primary tumor; N = regional lymph node; M = distant metastasis; c = clinical; LDH = lactate dehydrogenase; No. = number.
aAdapted from AJCC: Melanoma of the Skin. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp. 563–85.
IAT1a, N0, M0T1a = <0.8 mm/without ulceration.N0 = No regional metastases detected.M0 = No evidence of distant metastasis.
IBT1b, N0, M0T1b = <0.8 mm with ulceration; 0.8–1.0 mm with or without ulceration.N0 = No regional metastases detected.M0 = No evidence of distant metastasis.
T2a, N0, M0T2a = >1.0–2.0 mm/without ulceration.N0 = No regional metastases detected.M0 = No evidence of distant metastasis.
Table 5. Definition of cTNM Stages IIA, IIB, and IICa
StageTNMT Category (Thickness/Ulceration Status)N Category (No. of Tumor-Involved Regional Lymph Nodes/Presence of In-Transit, Satellite, and/or Microsatellite Metastases) M Category (Anatomic Site/LDH Level)
T = primary tumor; N = regional lymph node; M = distant metastasis; c = clinical; LDH = lactate dehydrogenase; No. = number.
aAdapted from AJCC: Melanoma of the Skin. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp. 563–85.
IIAT2b, N0, M0T2b = >1.0–2.0 mm/with ulceration.N0 = No regional metastases detected.M0 = No evidence of distant metastasis.
T3a, N0, M0T3a = >2.0–4.0 mm/without ulceration.N0 = No regional metastases detected.M0 = No evidence of distant metastasis.
IIBT3b, N0, M0T3b = >2.0–4.0 mm/with ulceration.N0 = No regional metastases detected.M0 = No evidence of distant metastasis.
T4a, N0, M0T4a = >4.0 mm/without ulceration.N0 = No regional metastases detected.M0 = No evidence of distant metastasis.
IICT4b, N0, M0T4b = >4.0 mm/with ulceration.N0 = No regional metastases detected.M0 = No evidence of distant metastasis.
Table 6. Definition of cTNM Stage IIIa
Stage TNMT Category (Thickness/Ulceration Status)N Category (No. of Tumor-Involved Regional Lymph Nodes/Presence of In-Transit, Satellite, and/or Microsatellite Metastases)M Category (Anatomic Site/LDH)
T = primary tumor; N = regional lymph node; M = distant metastasis; c = clinical; LDH = lactate dehydrogenase; No. = number.
aAdapted from AJCC: Melanoma of the Skin. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp. 563–85.
bFor example, diagnosis by curettage.
cFor example, unknown primary or completely regressed melanoma.
dThickness and ulceration status not applicable.
eDetected by sentinel lymph node biopsy.
IIIAny T, Tis, ≥N1, M0TX = Primary tumor cannot be assessed.b,dN1a = One clinically occult nodee /in-transit, satellite, and/or microsatellite metastases not present. M0 = No evidence of distant metastasis.
T0 = No evidence of primary tumor.c,d
Tis = Melanoma in situ.dN1b = One clinically detected node/in-transit, satellite, and/or microsatellite metastases not present.
T1a = <0.8 mm/without ulceration.N1c = No regional lymph node disease/in-transit, satellite, and/or microsatellite metastases present.
T1b = <0.8 mm with ulceration; 0.8–1.0 mm with or without ulceration.N2a = Two or three clinically occult nodese/in-transit, satellite, and/or microsatellite metastases not present.
T2a = >1.0–2.0 mm/without ulceration.N2b = Two or three nodes at least one of which was clinically detected/in-transit, satellite, and or microsatellite metastases not present.
T2b = >1.0–2.0 mm/with ulceration.N2c = One clinically occult or clinically detected node/in-transit, satellite, and/or microsatellite metastases present.
T3a = >2.0–4.0 mm/without ulceration.N3a = Four or more clinically occult nodese/in-transit, satellite, and/or microsatellite metastases not present.
T3b = >2.0–4.0 mm/with ulceration.N3b = Four or more nodes, at least one of which was clinically detected, or presence of any number of matted nodes/in-transit, satellite, and/or microsatellite metastases not present.
T4a = >4.0 mm/without ulceration.N3c = Two or more clinically occult or clinically detected nodes and/or presence of any number of matted nodes/in-transit, satellite, and/or microsatellite metastases present.
T4b = >4.0 mm/with ulceration.
Table 7. Definition of cTNM Stage IVa
Stage TNMT Category (Thickness/Ulceration Status)N Category (No. of Tumor-Involved Regional Lymph Nodes/Presence of In-Transit, Satellite, and/or Microsatellite Metastases)M Category (Anatomic Site/LDH Level)
T = primary tumor; N = regional lymph node; M = distant metastasis; c = clinical; CNS = central nervous system; LDH = lactate dehydrogenase; No. = number.
aAdapted from AJCC: Melanoma of the Skin. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp. 563–85.
bFor example, sentinel lymph node biopsy not performed, regional nodes previously removed for another reason. (Exception: pathological N category is not required for T1 melanomas, use cN).
IVAny T, Any N, M1Any T = See Table 6 for description.NX = Regional nodes not assessed;b N0 = No regional metastases; ≥N1 = See Table 6 for description.M1 = Evidence of distant metastasis.
–M1a = Distant metastasis to skin, soft tissue including muscle, and/or nonregional lymph nodes [M1a(0) = LDH not elevated; M1a(1) = LDH elevated].
–M1b = Distant metastasis to lung with or without M1a sites of disease [M1b(0) = LDH not elevated; M1b(1) = LDH elevated].
–M1c = Distant metastasis to non-CNS visceral sites with or without M1a or M1b sites of disease [M1c(0) = LDH not elevated; OR M1c(1) = LDH elevated].
–M1d = Distant metastasis to CNS with or without M1a, M1b, or M1c sites of disease [M1d(0) = LDH not elevated; M1d(1) = LDH elevated].

AJCC Prognostic Stage Groups-Pathological (pTNM)

Table 8. Definition of pTNM Stage 0a,b
StageTNMT Category (Thickness/Ulceration Status)N Category (No. of Tumor-Involved Regional Lymph Nodes/Presence of In-Transit, Satellite, and/or Microsatellite Metastases)M Category (Anatomic Site/LDH Level)Illustration
T = primary tumor; N = regional lymph node; M = distant metastasis; cN = clinical N; LDH = lactate dehydrogenase; No. = number; p = pathological.
aAdapted from AJCC: Melanoma of the Skin. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp. 563–85.
bPathological stage 0 (melanoma in situ) and T1 do not require pathological evaluation of lymph nodes to complete pathological staging; use cN information to assign their pathological stage.
cThickness and ulceration status not applicable.
0Tis, N0, M0Tis = Melanoma in situ.b,cN0 = No regional metastases detected.M0 = No evidence of distant metastasis.
EnlargeStage 0 melanoma; drawing shows an abnormal area on the surface of the skin and abnormal melanocytes in the epidermis (outer layer of the skin). Also shown are the dermis (inner layer of the skin) and the subcutaneous tissue below the dermis.
Table 9. Definition of pTNM Stages IA and IBa,b
StageTNMT Category (Thickness/Ulceration Status)N Category (No. of Tumor-Involved Regional Lymph Nodes/Presence of In-Transit, Satellite, and/or Microsatellite Metastases)M Category (Anatomic Site/LDH Level)Illustration
T = primary tumor; N = regional lymph node; M = distant metastasis; cN = clinical N; LDH = lactate dehydrogenase; No. = number; p = pathological.
aAdapted from AJCC: Melanoma of the Skin. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp. 563–85.
bPathological stage 0 (melanoma in situ) and T1 do not require pathological evaluation of lymph nodes to complete pathological staging; use cN information to assign their pathological stage.
IAT1a, N0, M0T1a = <0.8 mm/without ulceration.N0 = No regional metastases detected.M0 = No evidence of distant metastasis.
EnlargeTwo-panel drawing of stage I melanoma; the panel on the left shows a stage IA tumor that is not more than 1 millimeter thick, with ulceration (a break in the skin) and without ulceration. The panel on the right shows a stage IB tumor that is more than 1 but not more than 2 millimeters thick, without ulceration. Also shown are the epidermis (outer layer of the skin), the dermis (inner layer of the skin), and the subcutaneous tissue below the dermis.
T1b, N0, M0T1b = <0.8 mm with ulceration; 0.8–1.0 mm with or without ulceration.
IBT2a, N0, M0T2a = >1.0–2.0 mm/without ulceration.N0 = No regional metastases detected.M0 = No evidence of distant metastasis.
Table 10. Definition of pTNM Stages IIA, IIB, and IICa
StageTNMT Category (Thickness/Ulceration Status)N Category (No. of Tumor-Involved Regional Lymph Nodes/Presence of In-Transit, Satellite, and/or Microsatellite Metastases)M Category (Anatomic Site/LDH Level)Illustration
T = primary tumor; N = regional lymph node; M = distant metastasis; LDH = lactate dehydrogenase; No. = number; p = pathological.
aAdapted from AJCC: Melanoma of the Skin. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp. 563–85.
IIAT2b, N0, M0T2b = >1.0–2.0 mm/with ulceration.N0 = No regional metastases detected.M0 = No evidence of distant metastasis.
EnlargeTwo-panel drawing of stage IIA melanoma; the panel on the left shows a tumor that is more than 1 but not more than 2 millimeters thick, with ulceration (a break in the skin). The panel on the right shows a tumor that is more than 2 but not more than 4 millimeters thick, without ulceration. Also shown are the epidermis (outer layer of the skin), the dermis (inner layer of the skin), and the subcutaneous tissue below the dermis.
T3a, N0, M0T3a = >2.0–4.0 mm/without ulceration.
IIBT3b, N0, M0T3b = >2.0–4.0 mm/with ulceration.N0 = No regional metastases detected.M0 = No evidence of distant metastasis.
EnlargeTwo-panel drawing of stage IIB melanoma; the panel on the left shows a tumor that is more than 2 but not more than 4 millimeters thick, with ulceration (a break in the skin). There is also an inset that shows 2 millimeters is about the size of a new crayon point and 5 millimeters is about the size of a pencil-top eraser. The panel on the right shows a tumor that is more than 4 millimeters thick, without ulceration. There is also an inset that shows 5 millimeters is about the size of a pencil-top eraser. Also shown are the epidermis (outer layer of the skin), the dermis (inner layer of the skin), and the subcutaneous tissue below the dermis.
T4a, N0, M0T4a = >4.0 mm/without ulceration.
IICT4b, N0, M0T4b = >4.0 mm/with ulceration.N0 = No regional metastases detected.M0 = No evidence of distant metastasis.
EnlargeStage IIC melanoma; drawing shows a tumor that is more than 4 millimeters thick, with ulceration (a break in the skin). Also shown are the epidermis (outer layer of the skin), the dermis (inner layer of the skin), and the subcutaneous tissue below the dermis.
Table 11. Definition of pTNM Stages IIIA, IIIB, IIIC, and IIIDa
StageTNMT Category (Thickness/Ulceration Status)N Category (No. of Tumor-Involved Regional Lymph Nodes/Presence of In-Transit, Satellite, and/or Microsatellite Metastases)M Category (Anatomic Site/LDH Level)
T = primary tumor; N = regional lymph node; M = distant metastasis; LDH = lactate dehydrogenase; No. = number; p = pathological.
aAdapted from AJCC: Melanoma of the Skin. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp. 563–85.
bDetected by sentinel lymph node biopsy.
cFor example, unknown primary or completely regressed melanoma.
dThickness and ulceration status not applicable.
IIIAT1a/b–T2a, N1a or N2a, M0T1a = <0.8 mm/without ulceration/T1b = <0.8 mm with ulceration; 0.8–1.0 mm with or without ulceration.N1a = One clinically occult nodeb/in-transit, satellite, and/or microsatellite metastases not present; OR N2a = Two or three clinically occult nodesb/in-transit, satellite, and/or microsatellite metastases not present.M0 = No evidence of distant metastasis.
T2a = >1.0–2.0 mm/without ulceration.
IIIBT0, N1b, N1c, M0T0 = No evidence of primary tumor.c,dN1b = One clinically detected node/in-transit, satellite, and/or microsatellite metastases not present.M0 = No evidence of distant metastasis.
N1c = No regional lymph node disease/in-transit, satellite, and/or microsatellite metastases present.
T1a/b–T2a, N1b/c or N2b, M0T1a = <0.8 mm/without ulceration/T1b <0.8 mm with ulceration; 0.8–1.0 mm with or without ulceration.N1b = One clinically detected node/in-transit, satellite, and/or microsatellite metastases not present;/N1c = No regional lymph node disease/in-transit, satellite, and/or microsatellite metastases present; OR M0 = No evidence of distant metastasis.
T2a = >1.0–2.0 mm/without ulceration.
N2b = Two or three nodes at least one of which was clinically detected/in-transit, satellite, and or microsatellite metastases not present.
T2b/T3a, N1a–N2b, M0T2b = >1.0–2.0 mm/with ulceration/T3a = >2.0–4.0 mm/without ulceration.N1a = One clinically occult nodeb/in-transit, satellite, and/or microsatellite metastases not present.M0 = No evidence of distant metastasis.
N1b = One clinically detected node/in-transit, satellite, and/or microsatellite metastases not present.
N1c = No regional lymph node disease/in-transit, satellite, and/or microsatellite metastases present.
N2a = Two or three clinically occult nodesb/in-transit, satellite, and/or microsatellite metastases not present.
N2b = Two or three nodes, at least one of which was clinically detected/in-transit, satellite, and/or microsatellite metastases not present.
IIICT0, N2b, N2c, N3b, or N3c, M0T0 = No evidence of primary tumor.c,dN2b = Two or three nodes, at least one of which was clinically detected/in-transit, satellite, and/or microsatellite metastases not present.M0 = No evidence of distant metastasis.
N2c = One clinically occult or clinically detected node/in-transit, satellite, and/or microsatellite metastases present.
N3b = Four or more nodes, at least one of which was clinically detected, or presence of any number of matted nodes/in-transit, satellite, and/or microsatellite metastases not present; OR
N3c = Two or more clinically occult or clinically detected nodes and/or presence of any number of matted nodes/in-transit, satellite, and/or microsatellite metastases present.
T1a–T3a, N2c or N3a/b/c, M0T1a = <0.8 mm/without ulceration/T1b = <0.8 mm with ulceration; 0.8–1.0 mm with or without ulceration.N2c = One clinically occult or clinically detected node/in-transit, satellite, and/or microsatellite metastases present; OR M0 = No evidence of distant metastasis.
T2a = >1.0–2.0 mm/without ulceration.
T2b = >1.0–2.0 mm/with ulceration.
N3a = Four or more clinically occult nodesb/in-transit, satellite, and/or microsatellite metastases not present.
N3b = Four or more nodes, at least one of which was clinically detected, or presence of any number of matted nodes/in-transit, satellite, and/or microsatellite metastases not present.
T3a = >2.0–4.0 mm/without ulceration.N3c = Two or more clinically occult or clinically detected nodes and/or presence of any number of matted nodes/in-transit, satellite, and/or microsatellite metastases present.
T3b/T4a, Any N ≥N1, M0T3b = >2.0–4.0 mm/with ulceration/T4a = >4.0 mm/without ulceration.N1a = One clinically occult nodeb/in-transit, satellite, and/or microsatellite metastases not present. M0 = No evidence of distant metastasis.
N1b = One clinically detected node/in-transit, satellite, and/or microsatellite metastases not present.
N1c = No regional lymph node disease/in-transit, satellite, and/or microsatellite metastases present.
N2a = Two or three clinically occult nodesb/in-transit, satellite, and/or microsatellite metastases not present.
N2b = Two or three nodes, at least one of which was clinically detected/in-transit, satellite, and/or microsatellite metastases not present.
N2c = One clinically occult or clinically detected node/in-transit, satellite, and/or microsatellite metastases present.
N3a = Four or more clinically occult nodesb/in-transit, satellite, and/or microsatellite metastases not present.
N3b = Four or more nodes, at least one of which was clinically detected, or presence of any number of matted nodes/in-transit, satellite, and/or microsatellite metastases not present.
N3c = Two or more clinically occult or clinically detected nodes and/or presence of any number of matted nodes/in-transit, satellite, and/or microsatellite metastases present.
T4b, N1a–N2c, M0T4b = >4.0 mm/with ulceration.N1a = One clinically occult nodeb/in-transit, satellite, and/or microsatellite metastases not present. M0 = No evidence of distant metastasis.
N1b = One clinically detected node/in-transit, satellite, and/or microsatellite metastases not present.
N1c = No regional lymph node disease/in-transit, satellite, and/or microsatellite metastases present.
N2a = Two or three clinically occult nodesb/in-transit, satellite, and/or microsatellite metastases not present.
N2b = Two or three nodes, at least one of which was clinically detected/in-transit, satellite, and/or microsatellite metastases not present.
N2c = One clinically occult or clinically detected node/in-transit, satellite, and/or microsatellite metastases present.
IIIDT4b, N3a/b/c, M0T4b = >4.0 mm/with ulceration.N3a = Four or more clinically occult nodesb/in-transit, satellite, and/or microsatellite metastases not present.M0 = No evidence of distant metastasis.
N3b = Four or more nodes, at least one of which was clinically detected, or presence of any number of matted nodes/in-transit, satellite, and/or microsatellite metastases not present.
N3c = Two or more clinically occult or clinically detected nodes and/or presence of any number of matted nodes/in-transit, satellite, and/or microsatellite metastases present.
Table 12. Definition of pTNM Stage IVa
StageTNMT Category (Thickness/Ulceration Status)N Category (No. of Tumor-Involved Regional Lymph Nodes/Presence of In-Transit, Satellite, and/or Microsatellite Metastases)M Category (Anatomic Site/LDH Level)Illustration
T = primary tumor; N = regional lymph node; M = distant metastasis; cN = clinical N; CNS = central nervous system; LDH = lactate dehydrogenase; No. = number; p = pathological.
aAdapted from AJCC: Melanoma of the Skin. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp. 563–85.
bFor example, sentinel lymph node biopsy not performed, regional nodes previously removed for another reason. (Exception: pathological N category is not required for T1 melanomas, use cN).
cPathological stage 0 (melanoma in situ) and T1 do not require pathological evaluation of lymph nodes to complete pathological staging; use cN information to assign their pathological stage.
dThickness and ulceration status not applicable.
IVAny T, Tis, Any N, M1Any T = See Table 6 for description.NX = Regional nodes not assessed;d N0 = No regional metastases; ≥N1 = See Table 6 for description.M1 = Evidence of distant metastasis.
EnlargeStage IV melanoma; drawing shows other parts of the body where melanoma may spread, including the brain, spinal cord, lung, liver, gastrointestinal (GI) tract, bone, muscle, and distant lymph nodes. An inset shows cancer cells spreading through the blood and lymph system to another part of the body where a metastatic tumor has formed.
Tis = Melanoma in situ.b,c–M1a = Distant metastasis to skin, soft tissue including muscle, and/or nonregional lymph nodes [M1a(0) = LDH not elevated; M1a(1) = LDH elevated].
–M1b = Distant metastasis to lung with or without M1a sites of disease [M1b(0) = LDH not elevated; M1b(1) = LDH elevated].
–M1c - Distant metastasis to non-CNS visceral sites with or without M1a or M1b sites of disease [M1c(0) = LDH not elevated; M1c(1) = LDH elevated].
–M1d = Distant metastasis to CNS with or without M1a, M1b, or M1c sites of disease [M1d(0) = LDH not elevated; M1d(1) = LDH elevated].
References
  1. Melanoma of the Skin. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. Springer; 2017, pp. 563–85.

Treatment Option Overview for Melanoma

Table 13. Standard Treatment Options for Melanoma
Stage (TNM Staging Criteria)Standard Treatment Optionsa
aClinical trials are an important option for patients with all stages of melanoma because advances in understanding the aberrant molecular and biological pathways have led to rapid drug development. Standard treatment options are available in many clinical trials. Information about ongoing clinical trials is available from the NCI website.
Stage 0 melanomaExcision
Stage I melanoma Excision +/− lymph node management
Stage II melanomaExcision +/− lymph node management
Resectable Stage III melanomaExcision +/− lymph node management
Unresectable Stage III, Stage IV, and Recurrent melanomaIntralesional therapy
Immunotherapy
Signal transduction inhibitors
Chemotherapy
Palliative local therapy

Excision

Surgical excision remains the primary modality for treating melanoma. Cutaneous melanomas that have not spread beyond the initial site are highly curable. The treatment for localized melanoma is surgical excision with margins proportional to the microstage of the primary lesion.

Lymph node management

Sentinel lymph node biopsy (SLNB)

Lymphatic mapping and SLNB can be considered to assess the presence of occult metastasis in the regional lymph nodes of patients with primary tumors larger than 1 to 4 mm, potentially identifying individuals who may be spared the morbidity of regional lymph node dissections and individuals who may benefit from adjuvant therapy.[1-6]

To ensure accurate identification of the sentinel lymph node, lymphatic mapping and removal of the SLN should precede wide excision of the primary melanoma.

Multiple studies have demonstrated the diagnostic accuracy of SLNB, with false-negative rates of 0% to 2%.[1,6-11] If metastatic melanoma is detected, a complete regional lymphadenectomy can be performed in a second procedure.

Complete lymph node dissection (CLND)

Patients can be considered for CLND if the sentinel node(s) is microscopically or macroscopically positive for regional control or considered for entry into the Multicenter Selective Lymphadenectomy Trial II (NCT00297895) to determine whether CLND affects survival. SLNB should be performed before wide excision of the primary melanoma to ensure accurate lymphatic mapping.

Adjuvant Therapy

Adjuvant therapy options are expanding for patients at high risk of recurrence after complete resection and include checkpoint inhibitors and combination signal transduction inhibitor therapy. Ipilimumab was the first checkpoint inhibitor to be approved by the U.S. Food and Drug Administration (FDA) as adjuvant therapy, and it has demonstrated improved overall survival (OS) at 10 mg/kg (ipi10) compared with placebo (EORTC 18071 [NCT00636168]).[12] However, ipi10 has significant toxicity at this dose. The North American Intergroup Trial E1609 (NCT01274338), designed with three treatment groups, compared ipi10 with ipilimumab at a lower dose of 3 mg/kg (ipi3) (approved for metastatic melanoma) and with high-dose interferon (HDI). Ipi3 showed a significant improvement in OS whereas ipi10 did not.[13] These data remove support for HDI as adjuvant treatment of melanoma. As newer checkpoint inhibitors emerge, the role of ipi3 remains to be further defined.

Large randomized trials with the newer checkpoint inhibitors (nivolumab and pembrolizumab) and with combination signal transduction inhibitors (dabrafenib plus trametinib) showed a clinically significant impact on relapse-free survival (RFS). CheckMate 238 (NCT02388906) compared nivolumab with ipi10 and found that nivolumab was superior in RFS and had a more tolerable safety profile.[14] Pembrolizumab was superior to placebo in RFS, with data on OS still maturing in the MK-3475-054/KEYNOTE-054 trial (NCT02362594).[15] Dabrafenib plus trametinib was superior to placebo in RFS, with data on OS still maturing in the COMBI-AD trial (NCT01682083).[16] Single-agent BRAF-inhibitor therapy with vemurafenib did not show improved RFS compared with placebo in the BRIM8 trial (NCT01667419).[17]

The benefit of immunotherapy with ipilimumab, nivolumab, and pembrolizumab has been seen regardless of programmed death-ligand 1 (PD-L1) expression or BRAF mutations. Combination signal transduction inhibitor therapy is an additional option for patients with BRAF mutations.

Participation in clinical trials designed to identify treatments that will further extend RFS and OS with less toxicity and shorter treatment schedules is an important option for all patients.

Limb Perfusion

A completed, multicenter, phase III randomized trial (SWOG-8593) of patients with high-risk primary stage I limb melanoma did not show a disease-free survival or OS benefit from isolated limb perfusion with melphalan, when compared with surgery alone.[5]

Systematic Treatment for Unresectable Stage III, Stage IV, and Recurrent Disease

Although melanoma that has spread to distant sites is rarely curable, treatment options are rapidly expanding. Two approaches—checkpoint inhibition and targeting the mitogen-activated protein kinase pathway—have demonstrated improvement in OS in randomized trials. Given the rapid development of new agents and combinations, patients and their physicians are encouraged to consider treatment in a clinical trial for initial treatment and at the time of progression.

Immunotherapy

Checkpoint inhibitors

The FDA has approved three checkpoint inhibitors: pembrolizumab, nivolumab, and ipilimumab. Each has demonstrated the ability to impact OS against different comparators in unresectable or advanced disease. For more information, see the sections on Pembrolizumab, Nivolumab, and Ipilimumab. Multiple phase III trials are in progress to determine optimal sequencing of immunotherapies, immunotherapy with targeted therapy, and whether combinations of immunotherapies or immunotherapy plus targeted therapy are superior for increasing OS.

Interleukin-2 (IL-2)

The FDA approved IL-2 in 1998 because of durable complete response (CR) rates in a minority of patients (6%–7%) with previously treated metastatic melanoma in eight phase I and II studies. Phase III trials comparing high-dose IL-2 with other treatments and providing an assessment of relative impact on OS have not been conducted.

Dual checkpoint inhibition

The combination of anti–programmed death-1 (PD-1) and anti–cytotoxic T-lymphocyte antigen-4 (CTLA-4) immunotherapies (nivolumab and ipilimumab) has demonstrated prolongation of progression-free survival (PFS) and OS compared with ipilimumab monotherapy, but the combination is associated with significant toxicity.

Signal transduction inhibitors

Studies to date indicate that both BRAF and MEK inhibitors can significantly impact the natural history of melanoma, although they do not appear to be curative as single agents. Two combination regimens of BRAF and MEK inhibitors have demonstrated improved PFS and OS compared with BRAF inhibitor monotherapy.

BRAF inhibitors
Vemurafenib

Vemurafenib, approved by the FDA in 2011, has shown an improvement in PFS and OS in patients with unresectable or advanced disease. Vemurafenib is an orally available, small-molecule, selective BRAF V600E kinase inhibitor, and its indication is limited to patients with a demonstrated BRAF V600E mutation by an FDA-approved test.[11]

Dabrafenib

Dabrafenib is an orally available, small-molecule, selective BRAF inhibitor that was approved by the FDA in 2013. It showed improvement in PFS when compared with dacarbazine in an international multicenter trial (BREAK-3 [NCT01227889]).

MEK inhibitors
Trametinib

Trametinib is an orally available, small-molecule, selective inhibitor of MEK1 and MEK2. The FDA approved trametinib in 2013 for patients with unresectable or metastatic melanoma with BRAF V600E or K mutations. Trametinib demonstrated improved PFS over dacarbazine.

Cobimetinib

Cobimetinib is an orally available, small-molecule, selective MEK inhibitor. The FDA approved cobimetinib in 2015 for use in combination with the BRAF inhibitor vemurafenib. For more information, see the Combination signal transduction inhibitor therapy section.

c-KIT inhibitors

Early data suggest that mucosal or acral melanomas with activating mutations or amplifications in c-KIT may be sensitive to a variety of c-KIT inhibitors.[18-20] Phase II and phase III trials are available for patients with unresectable stage III or stage IV melanoma harboring the c-KIT mutation.

Combination signal transduction inhibitor therapy

The FDA approved two combination regimens, dabrafenib plus trametinib and vemurafenib plus cobimetinib, in patients with unresectable or metastatic melanomas that carry the BRAF V600E or V600K mutation as confirmed by an FDA-approved test. The approvals were based on improved PFS and OS when compared with a single-agent BRAF inhibitor (either dabrafenib or vemurafenib).

Combination signal transduction inhibitor therapy plus anti-PD-L1 therapy

The triplet regimen of cobimetinib (MEK inhibitor), vemurafenib (BRAF kinase inhibitor), and atezolizumab (PD-L1 inhibitor) showed improved PFS over the combination of cobimetinib and vemurafenib.[21]

Chemotherapy

Dacarbazine

Dacarbazine was approved in 1970 on the basis of overall response rates. Phase III trials indicated an overall response rate of 10% to 20%, with rare CRs observed. An impact on OS has not been demonstrated in randomized trials.[22-25] When used as a control arm for recent registration trials of ipilimumab and vemurafenib in previously untreated patients with metastatic melanoma, dacarbazine was shown to be inferior for OS.

Temozolomide

Temozolomide, an oral alkylating agent, appeared to be similar to intravenous dacarbazine in a randomized phase III trial with a primary end point of OS. However, because the trial was designed to demonstrate the superiority of temozolomide, which was not achieved, the trial was left with a sample size that was inadequate to provide statistical proof of noninferiority.[23]

Palliative local therapy

Melanoma metastatic to distant, lymph node–bearing areas may be palliated by regional lymphadenectomy. Isolated metastases to the lung, gastrointestinal tract, bone, or sometimes the brain may be palliated by resection, with occasional long-term survival.[14,26,27]

References
  1. Shen P, Wanek LA, Morton DL: Is adjuvant radiotherapy necessary after positive lymph node dissection in head and neck melanomas? Ann Surg Oncol 7 (8): 554-9; discussion 560-1, 2000. [PUBMED Abstract]
  2. Hochwald SN, Coit DG: Role of elective lymph node dissection in melanoma. Semin Surg Oncol 14 (4): 276-82, 1998. [PUBMED Abstract]
  3. Wagner JD, Gordon MS, Chuang TY, et al.: Current therapy of cutaneous melanoma. Plast Reconstr Surg 105 (5): 1774-99; quiz 1800-1, 2000. [PUBMED Abstract]
  4. Cascinelli N, Morabito A, Santinami M, et al.: Immediate or delayed dissection of regional nodes in patients with melanoma of the trunk: a randomised trial. WHO Melanoma Programme. Lancet 351 (9105): 793-6, 1998. [PUBMED Abstract]
  5. Koops HS, Vaglini M, Suciu S, et al.: Prophylactic isolated limb perfusion for localized, high-risk limb melanoma: results of a multicenter randomized phase III trial. European Organization for Research and Treatment of Cancer Malignant Melanoma Cooperative Group Protocol 18832, the World Health Organization Melanoma Program Trial 15, and the North American Perfusion Group Southwest Oncology Group-8593. J Clin Oncol 16 (9): 2906-12, 1998. [PUBMED Abstract]
  6. Wong SL, Balch CM, Hurley P, et al.: Sentinel lymph node biopsy for melanoma: American Society of Clinical Oncology and Society of Surgical Oncology joint clinical practice guideline. J Clin Oncol 30 (23): 2912-8, 2012. [PUBMED Abstract]
  7. Kirkwood JM, Strawderman MH, Ernstoff MS, et al.: Interferon alfa-2b adjuvant therapy of high-risk resected cutaneous melanoma: the Eastern Cooperative Oncology Group Trial EST 1684. J Clin Oncol 14 (1): 7-17, 1996. [PUBMED Abstract]
  8. Kirkwood JM, Ibrahim JG, Sondak VK, et al.: High- and low-dose interferon alfa-2b in high-risk melanoma: first analysis of intergroup trial E1690/S9111/C9190. J Clin Oncol 18 (12): 2444-58, 2000. [PUBMED Abstract]
  9. Eggermont AM, Suciu S, Santinami M, et al.: Adjuvant therapy with pegylated interferon alfa-2b versus observation alone in resected stage III melanoma: final results of EORTC 18991, a randomised phase III trial. Lancet 372 (9633): 117-26, 2008. [PUBMED Abstract]
  10. Hancock BW, Wheatley K, Harris S, et al.: Adjuvant interferon in high-risk melanoma: the AIM HIGH Study--United Kingdom Coordinating Committee on Cancer Research randomized study of adjuvant low-dose extended-duration interferon Alfa-2a in high-risk resected malignant melanoma. J Clin Oncol 22 (1): 53-61, 2004. [PUBMED Abstract]
  11. Chapman PB, Hauschild A, Robert C, et al.: Improved survival with vemurafenib in melanoma with BRAF V600E mutation. N Engl J Med 364 (26): 2507-16, 2011. [PUBMED Abstract]
  12. Eggermont AM, Chiarion-Sileni V, Grob JJ, et al.: Prolonged Survival in Stage III Melanoma with Ipilimumab Adjuvant Therapy. N Engl J Med 375 (19): 1845-1855, 2016. [PUBMED Abstract]
  13. Tarhini AA, Lee SJ, Hodi FS, et al.: Phase III Study of Adjuvant Ipilimumab (3 or 10 mg/kg) Versus High-Dose Interferon Alfa-2b for Resected High-Risk Melanoma: North American Intergroup E1609. J Clin Oncol 38 (6): 567-575, 2020. [PUBMED Abstract]
  14. Leo F, Cagini L, Rocmans P, et al.: Lung metastases from melanoma: when is surgical treatment warranted? Br J Cancer 83 (5): 569-72, 2000. [PUBMED Abstract]
  15. Eggermont AMM, Blank CU, Mandala M, et al.: Adjuvant Pembrolizumab versus Placebo in Resected Stage III Melanoma. N Engl J Med 378 (19): 1789-1801, 2018. [PUBMED Abstract]
  16. Long GV, Hauschild A, Santinami M, et al.: Adjuvant Dabrafenib plus Trametinib in Stage III BRAF-Mutated Melanoma. N Engl J Med 377 (19): 1813-1823, 2017. [PUBMED Abstract]
  17. Maio M, Lewis K, Demidov L, et al.: Adjuvant vemurafenib in resected, BRAFV600 mutation-positive melanoma (BRIM8): a randomised, double-blind, placebo-controlled, multicentre, phase 3 trial. Lancet Oncol 19 (4): 510-520, 2018. [PUBMED Abstract]
  18. Hodi FS, Friedlander P, Corless CL, et al.: Major response to imatinib mesylate in KIT-mutated melanoma. J Clin Oncol 26 (12): 2046-51, 2008. [PUBMED Abstract]
  19. Guo J, Si L, Kong Y, et al.: Phase II, open-label, single-arm trial of imatinib mesylate in patients with metastatic melanoma harboring c-Kit mutation or amplification. J Clin Oncol 29 (21): 2904-9, 2011. [PUBMED Abstract]
  20. Carvajal RD, Antonescu CR, Wolchok JD, et al.: KIT as a therapeutic target in metastatic melanoma. JAMA 305 (22): 2327-34, 2011. [PUBMED Abstract]
  21. Gutzmer R, Stroyakovskiy D, Gogas H, et al.: Atezolizumab, vemurafenib, and cobimetinib as first-line treatment for unresectable advanced BRAFV600 mutation-positive melanoma (IMspire150): primary analysis of the randomised, double-blind, placebo-controlled, phase 3 trial. Lancet 395 (10240): 1835-1844, 2020. [PUBMED Abstract]
  22. Chapman PB, Einhorn LH, Meyers ML, et al.: Phase III multicenter randomized trial of the Dartmouth regimen versus dacarbazine in patients with metastatic melanoma. J Clin Oncol 17 (9): 2745-51, 1999. [PUBMED Abstract]
  23. Middleton MR, Grob JJ, Aaronson N, et al.: Randomized phase III study of temozolomide versus dacarbazine in the treatment of patients with advanced metastatic malignant melanoma. J Clin Oncol 18 (1): 158-66, 2000. [PUBMED Abstract]
  24. Avril MF, Aamdal S, Grob JJ, et al.: Fotemustine compared with dacarbazine in patients with disseminated malignant melanoma: a phase III study. J Clin Oncol 22 (6): 1118-25, 2004. [PUBMED Abstract]
  25. Robert C, Thomas L, Bondarenko I, et al.: Ipilimumab plus dacarbazine for previously untreated metastatic melanoma. N Engl J Med 364 (26): 2517-26, 2011. [PUBMED Abstract]
  26. Ollila DW, Hsueh EC, Stern SL, et al.: Metastasectomy for recurrent stage IV melanoma. J Surg Oncol 71 (4): 209-13, 1999. [PUBMED Abstract]
  27. Gutman H, Hess KR, Kokotsakis JA, et al.: Surgery for abdominal metastases of cutaneous melanoma. World J Surg 25 (6): 750-8, 2001. [PUBMED Abstract]

Treatment of Stage 0 Melanoma

Standard Treatment Options for Stage 0 Melanoma

Standard treatment options for stage 0 melanoma include the following:

  1. Excision.

Excision

Patients with stage 0 disease may be treated by excision with minimal, but microscopically free, margins.

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

Treatment of Stage I Melanoma

Standard Treatment Options for Stage I Melanoma

Standard treatment options for stage I melanoma include the following:

  1. Excision with or without lymph node management.

Excision

Evidence suggests that lesions no thicker than 2 mm may be treated conservatively with radial excision margins of 1 cm.

Depending on the location of the melanoma, most patients can now have the excision performed on an outpatient basis.

Evidence (excision):

  1. A randomized trial compared narrow margins (1 cm) with wide margins (≥3 cm) in patients with melanomas no thicker than 2 mm.[1,2][Level of evidence A1]
    • No difference was observed between the two groups in the development of metastatic disease, disease-free survival (DFS), or overall survival (OS).
  2. Two other randomized trials compared 2-cm margins with wider margins (4 cm or 5 cm).[3,4][Level of evidence A1]
    • No statistically significant difference in local recurrence, distant metastasis, or OS was found; the median follow-up was at least 10 years for both trials.
  3. In the Intergroup Melanoma Surgical Trial, the reduction in margins from 4 cm to 2 cm was associated with both of the following:[5][Level of evidence A1]
    • A statistically significant reduction in the need for skin grafting (from 46% to 11%; P < .001).
    • A reduction in the length of hospital stay.
  4. A multicenter, phase III randomized trial (SWOG-8593) of patients with high-risk stage I primary limb melanoma did not show a DFS or OS benefit from isolated limb perfusion with melphalan, when compared with surgery alone.[6,7]
Lymph node management

Elective regional lymph node dissection is of no proven benefit for patients with stage I melanoma.[8]

Lymphatic mapping and sentinel lymph node biopsy (SLNB) for patients who have tumors of intermediate thickness and/or ulcerated tumors may identify individuals with occult nodal disease. These patients may benefit from regional lymphadenectomy and adjuvant therapy.[6,9-11]

Evidence (immediate lymphadenectomy vs. observation with delayed lymphadenectomy):

  1. The International Multicenter Selective Lymphadenectomy Trial (MSLT-1 [JWCI-MORD-MSLT-1193]) included 1,269 patients with intermediate-thickness (defined as 1.2 mm–3.5 mm in this study) primary melanomas.[12][Level of evidence A1]
    • There was no melanoma-specific survival advantage (primary end point) for patients randomly assigned to undergo wide excision plus SLNB, followed by immediate complete lymphadenectomy for node positivity versus nodal observation and delayed lymphadenectomy for subsequent nodal recurrence at a median of 59.8 months.
    • This trial was not designed to detect a difference in the impact of lymphadenectomy in patients with microscopic lymph node involvement.
  2. The Sunbelt Melanoma Trial (UAB-9735 [NCT00004196]) was a phase III trial to determine the effects of lymphadenectomy with or without adjuvant high-dose interferon alpha-2b versus observation on DFS and OS in patients with submicroscopic sentinel lymph node (SLN) metastasis detected only by the polymerase chain reaction assay (i.e., SLN negative by histology and immunohistochemistry).
    • No survival data have been reported from this study.

Treatment Options Under Clinical Evaluation for Stage I Melanoma

Treatment options under clinical evaluation for patients with stage I melanoma include the following:

  1. Clinical trials evaluating new techniques to detect submicroscopic SLN metastasis. Because of the higher rate of treatment failure in the subset of clinical stage I patients with occult nodal disease, clinical trials have evaluated new techniques to detect submicroscopic SLN metastasis to identify patients who may benefit from regional lymphadenectomy with or without adjuvant therapy.

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

References
  1. Veronesi U, Cascinelli N: Narrow excision (1-cm margin). A safe procedure for thin cutaneous melanoma. Arch Surg 126 (4): 438-41, 1991. [PUBMED Abstract]
  2. Veronesi U, Cascinelli N, Adamus J, et al.: Thin stage I primary cutaneous malignant melanoma. Comparison of excision with margins of 1 or 3 cm. N Engl J Med 318 (18): 1159-62, 1988. [PUBMED Abstract]
  3. Cohn-Cedermark G, Rutqvist LE, Andersson R, et al.: Long term results of a randomized study by the Swedish Melanoma Study Group on 2-cm versus 5-cm resection margins for patients with cutaneous melanoma with a tumor thickness of 0.8-2.0 mm. Cancer 89 (7): 1495-501, 2000. [PUBMED Abstract]
  4. Balch CM, Soong SJ, Smith T, et al.: Long-term results of a prospective surgical trial comparing 2 cm vs. 4 cm excision margins for 740 patients with 1-4 mm melanomas. Ann Surg Oncol 8 (2): 101-8, 2001. [PUBMED Abstract]
  5. Balch CM, Urist MM, Karakousis CP, et al.: Efficacy of 2-cm surgical margins for intermediate-thickness melanomas (1 to 4 mm). Results of a multi-institutional randomized surgical trial. Ann Surg 218 (3): 262-7; discussion 267-9, 1993. [PUBMED Abstract]
  6. Essner R, Conforti A, Kelley MC, et al.: Efficacy of lymphatic mapping, sentinel lymphadenectomy, and selective complete lymph node dissection as a therapeutic procedure for early-stage melanoma. Ann Surg Oncol 6 (5): 442-9, 1999 Jul-Aug. [PUBMED Abstract]
  7. Koops HS, Vaglini M, Suciu S, et al.: Prophylactic isolated limb perfusion for localized, high-risk limb melanoma: results of a multicenter randomized phase III trial. European Organization for Research and Treatment of Cancer Malignant Melanoma Cooperative Group Protocol 18832, the World Health Organization Melanoma Program Trial 15, and the North American Perfusion Group Southwest Oncology Group-8593. J Clin Oncol 16 (9): 2906-12, 1998. [PUBMED Abstract]
  8. Hochwald SN, Coit DG: Role of elective lymph node dissection in melanoma. Semin Surg Oncol 14 (4): 276-82, 1998. [PUBMED Abstract]
  9. Gershenwald JE, Thompson W, Mansfield PF, et al.: Multi-institutional melanoma lymphatic mapping experience: the prognostic value of sentinel lymph node status in 612 stage I or II melanoma patients. J Clin Oncol 17 (3): 976-83, 1999. [PUBMED Abstract]
  10. Mraz-Gernhard S, Sagebiel RW, Kashani-Sabet M, et al.: Prediction of sentinel lymph node micrometastasis by histological features in primary cutaneous malignant melanoma. Arch Dermatol 134 (8): 983-7, 1998. [PUBMED Abstract]
  11. Morton DL, Thompson JF, Cochran AJ, et al.: Sentinel-node biopsy or nodal observation in melanoma. N Engl J Med 355 (13): 1307-17, 2006. [PUBMED Abstract]
  12. Morton DL, Thompson JF, Cochran AJ, et al.: Final trial report of sentinel-node biopsy versus nodal observation in melanoma. N Engl J Med 370 (7): 599-609, 2014. [PUBMED Abstract]

Treatment of Stage II Melanoma

Standard Treatment Options for Stage II Melanoma

Standard treatment options for stage II melanoma include the following:

  1. Excision with or without lymph node management.

Excision

For melanomas with a thickness between 2 and 4 mm, surgical margins need to be 2 to 3 cm or smaller.

Few data are available to guide treatment in patients with melanomas thicker than 4 mm; however, most guidelines recommend margins of 3 cm whenever anatomically possible.

Depending on the location of the melanoma, most patients can have the excision performed on an outpatient basis.

Evidence (excision):

  1. The Intergroup Melanoma Surgical Trial Task 2b compared 2-cm versus 4-cm margins for patients with melanomas that were 1 mm to 4 mm thick.[1]
    • With a median follow-up of more than 10 years, no significant difference in local recurrence or survival was observed between the two groups.
    • The reduction in margins from 4 cm to 2 cm was associated with the following:
      • A statistically significant reduction in the need for skin grafting (from 46% to 11%; P < .001).
      • A reduction in the length of the hospital stay.
  2. A study conducted in the United Kingdom randomly assigned patients with melanomas thicker than 2 mm to undergo excision with either 1-cm or 3-cm margins.[2]
    • Patients treated with excision with 1-cm margins had higher rates of local regional recurrence (hazard ratio [HR], 1.26; 95% confidence interval [CI], 1.00–1.59; P = .05).
    • No difference in survival was seen (HR, 1.24; 95% CI, 0.96–1.61; P = .1).
    • This study suggests that 1-cm margins may not be adequate for patients with melanomas thicker than 2 mm.
Lymph node management
Lymphatic mapping and sentinel lymph node biopsy (SLNB)

Lymphatic mapping and SLNB have been used to assess the presence of occult metastasis in the regional lymph nodes of patients with stage II disease, potentially identifying individuals who may be spared the morbidity of regional lymph node dissections (LNDs) and individuals who may benefit from adjuvant therapy.[3-7]

To ensure accurate identification of the sentinel lymph node, lymphatic mapping and removal of the SLN should precede wide excision of the primary melanoma.

With the use of a vital blue dye and a radiopharmaceutical agent injected at the site of the primary tumor, the first lymph node in the lymphatic basin that drains the lesion can be identified, removed, and examined microscopically. Multiple studies have demonstrated the diagnostic accuracy of SLNB, with false-negative rates of 0% to 2%.[3,8-12] If metastatic melanoma is detected, a complete regional lymphadenectomy can be performed in a second procedure.

Regional lymphadenectomy

No published data on the clinical significance of micrometastatic melanoma in regional lymph nodes are available from prospective trials. Some evidence suggests that for patients with tumors of intermediate thickness and occult metastasis, survival is better among patients who undergo immediate regional lymphadenectomy than it is among those who delay lymphadenectomy until the clinical appearance of nodal metastasis.[13] This finding should be viewed with caution because it arose from a post hoc subset analysis of data from a randomized trial.

Evidence (regional lymphadenectomy):

  1. The International Multicenter Selective Lymphadenectomy Trial (MSLT-1 [JWCI-MORD-MSLT-1193]) included 1,269 patients with intermediate-thickness (defined as 1.2 mm–3.5 mm in this study) primary melanomas.[14][Level of evidence A1]
    • There was no melanoma-specific survival advantage (primary end point) for patients randomly assigned to undergo wide excision plus SLNB, followed by immediate complete lymphadenectomy for node positivity versus nodal observation and delayed lymphadenectomy for subsequent nodal recurrence at a median of 59.8 months.
    • This trial was not designed to detect a difference in the impact of lymphadenectomy in patients with microscopic lymph node involvement.
  2. Three other prospective randomized trials have failed to show a survival benefit for prophylactic regional LNDs.[15-17]

Treatment Options Under Clinical Evaluation for Stage II Melanoma

Postsurgical systemic adjuvant treatment has not been adequately studied in patients with stage II disease; therefore, clinical trials are an important therapeutic option for patients at high risk of relapse.

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

References
  1. Balch CM, Urist MM, Karakousis CP, et al.: Efficacy of 2-cm surgical margins for intermediate-thickness melanomas (1 to 4 mm). Results of a multi-institutional randomized surgical trial. Ann Surg 218 (3): 262-7; discussion 267-9, 1993. [PUBMED Abstract]
  2. Thomas JM, Newton-Bishop J, A'Hern R, et al.: Excision margins in high-risk malignant melanoma. N Engl J Med 350 (8): 757-66, 2004. [PUBMED Abstract]
  3. Gershenwald JE, Thompson W, Mansfield PF, et al.: Multi-institutional melanoma lymphatic mapping experience: the prognostic value of sentinel lymph node status in 612 stage I or II melanoma patients. J Clin Oncol 17 (3): 976-83, 1999. [PUBMED Abstract]
  4. McMasters KM, Reintgen DS, Ross MI, et al.: Sentinel lymph node biopsy for melanoma: controversy despite widespread agreement. J Clin Oncol 19 (11): 2851-5, 2001. [PUBMED Abstract]
  5. Cherpelis BS, Haddad F, Messina J, et al.: Sentinel lymph node micrometastasis and other histologic factors that predict outcome in patients with thicker melanomas. J Am Acad Dermatol 44 (5): 762-6, 2001. [PUBMED Abstract]
  6. Essner R: The role of lymphoscintigraphy and sentinel node mapping in assessing patient risk in melanoma. Semin Oncol 24 (1 Suppl 4): S8-10, 1997. [PUBMED Abstract]
  7. Chan AD, Morton DL: Sentinel node detection in malignant melanoma. Recent Results Cancer Res 157: 161-77, 2000. [PUBMED Abstract]
  8. Morton DL, Wen DR, Wong JH, et al.: Technical details of intraoperative lymphatic mapping for early stage melanoma. Arch Surg 127 (4): 392-9, 1992. [PUBMED Abstract]
  9. Reintgen D, Cruse CW, Wells K, et al.: The orderly progression of melanoma nodal metastases. Ann Surg 220 (6): 759-67, 1994. [PUBMED Abstract]
  10. Thompson JF, McCarthy WH, Bosch CM, et al.: Sentinel lymph node status as an indicator of the presence of metastatic melanoma in regional lymph nodes. Melanoma Res 5 (4): 255-60, 1995. [PUBMED Abstract]
  11. Uren RF, Howman-Giles R, Thompson JF, et al.: Lymphoscintigraphy to identify sentinel lymph nodes in patients with melanoma. Melanoma Res 4 (6): 395-9, 1994. [PUBMED Abstract]
  12. Bostick P, Essner R, Glass E, et al.: Comparison of blue dye and probe-assisted intraoperative lymphatic mapping in melanoma to identify sentinel nodes in 100 lymphatic basins. Arch Surg 134 (1): 43-9, 1999. [PUBMED Abstract]
  13. Cascinelli N, Morabito A, Santinami M, et al.: Immediate or delayed dissection of regional nodes in patients with melanoma of the trunk: a randomised trial. WHO Melanoma Programme. Lancet 351 (9105): 793-6, 1998. [PUBMED Abstract]
  14. Morton DL, Thompson JF, Cochran AJ, et al.: Sentinel-node biopsy or nodal observation in melanoma. N Engl J Med 355 (13): 1307-17, 2006. [PUBMED Abstract]
  15. Veronesi U, Adamus J, Bandiera DC, et al.: Delayed regional lymph node dissection in stage I melanoma of the skin of the lower extremities. Cancer 49 (11): 2420-30, 1982. [PUBMED Abstract]
  16. Sim FH, Taylor WF, Ivins JC, et al.: A prospective randomized study of the efficacy of routine elective lymphadenectomy in management of malignant melanoma. Preliminary results. Cancer 41 (3): 948-56, 1978. [PUBMED Abstract]
  17. Balch CM, Soong SJ, Bartolucci AA, et al.: Efficacy of an elective regional lymph node dissection of 1 to 4 mm thick melanomas for patients 60 years of age and younger. Ann Surg 224 (3): 255-63; discussion 263-6, 1996. [PUBMED Abstract]

Treatment of Resectable Stage III Melanoma

Standard Treatment Options for Resectable Stage III Melanoma

Standard treatment options for resectable stage III melanoma include the following:

  1. Excision with or without lymph node management.
  2. Adjuvant therapy.
    1. Immunotherapy.
    2. Combination signal transduction inhibitors.

Excision

The primary tumor may be treated with wide local excision with 1 to 3-cm margins, depending on tumor thickness and location.[1-7] Skin grafting may be necessary to close the resulting defect.

Lymph node management
Sentinel lymph node biopsy (SLNB)

Lymphatic mapping and SLNB can be considered to assess the presence of occult metastases in the regional lymph nodes of patients with primary tumors larger than 1 to 4 mm, potentially identifying individuals who may be spared the morbidity of regional lymph node dissections and individuals who may benefit from adjuvant therapy.[3,8-12]

To ensure accurate identification of the sentinel lymph node (SLN), lymphatic mapping and removal of the SLN should precede wide excision of the primary melanoma.

Multiple studies have demonstrated the diagnostic accuracy of SLNB, with false-negative rates of 0% to 2%.[8,12-17] If metastatic melanoma is detected, a complete regional lymphadenectomy can be performed in a second procedure.

Complete lymph node dissection (CLND)

Patients can be considered for CLND if the sentinel node(s) is microscopically or macroscopically positive for regional control or considered for entry into the Multicenter Selective Lymphadenectomy Trial II (NCT00297895) to determine whether CLND affects survival. SLNB should be performed prior to wide excision of the primary melanoma to ensure accurate lymphatic mapping.

Adjuvant Therapy

Adjuvant therapeutic options are expanding for patients at high risk of recurrence after complete resection and include checkpoint inhibitors and combination signal transduction inhibitor therapy. Ipilimumab was the first checkpoint inhibitor to be approved by the U.S. Food and Drug Administration (FDA) as adjuvant therapy, and it has demonstrated improved overall survival (OS) at 10 mg/kg (ipi10) compared with placebo (EORTC 18071 [NCT00636168]).[18] However, ipi10 has significant toxicity at this dose. The North American Intergroup Trial E1609 (NCT01274338), designed with three treatment groups, compared ipi10 with ipilimumab at a lower dose of 3 mg/kg (ipi3) (approved for metastatic disease) and with high-dose interferon (HDI). Ipi3 showed a significant improvement in OS whereas ipi10 did not.[19] These data remove support for HDI as adjuvant treatment for melanoma. As newer checkpoint inhibitors emerge, the role of ipi3 remains to be further defined.

Large randomized trials with the newer checkpoint inhibitors (nivolumab and pembrolizumab) and with combination signal transduction inhibitors (dabrafenib plus trametinib) showed a clinically significant impact on relapse-free survival (RFS). CheckMate 238 (NCT02388906) compared nivolumab with ipi10 and found that nivolumab was superior in RFS and had a more tolerable safety profile.[20] Pembrolizumab was superior to placebo in RFS, with data on OS still maturing in the MK-3475-054/KEYNOTE-054 trial (NCT02362594).[21] Dabrafenib plus trametinib was superior to placebo in RFS, with data on OS still maturing in the COMBI-AD trial (NCT01682083).[22] Single-agent BRAF-inhibitor therapy with vemurafenib did not show improved RFS compared with placebo in the BRIM8 trial (NCT01667419).[23]

The benefit of immunotherapy with ipilimumab, nivolumab, and pembrolizumab has been seen regardless of programmed death-ligand 1 (PD-L1) expression or BRAF mutations. Combination signal transduction inhibitor therapy with dabrafenib plus trametinib is an additional option for patients with BRAF mutations.

Participation in clinical trials to identify treatments that will further extend RFS and OS with less toxicity and shorter treatment schedules is an important option for all patients.

Immunotherapy
Checkpoint inhibitors
Nivolumab

Evidence (nivolumab):

  1. In a multinational, randomized, double-blind trial (CheckMate 238 [NCT02388906]), patients with stage IIIB, IIIC, or IV melanoma who underwent complete resection were randomly assigned (1:1) to receive either nivolumab or ipilimumab.[20][Level of evidence B1] The primary end point was RFS and was defined as time from randomization until the date of the first recurrence, new primary melanoma, or death from any cause. Patients who were excluded included those with resection occurring more than 12 weeks before randomization, autoimmune disease, use of systemic glucocorticoids, previous systemic therapy for melanoma, and an Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) score higher than 1. Nivolumab was administered at the dose of 3 mg/kg intravenously (IV) every 2 weeks and ipilimumab was administered at the dose of 10 mg/kg every 3 weeks for four doses, then every 3 months for up to 1 year or until disease recurrence, along with corresponding placebo.

    A total of 906 patients were randomly assigned: 453 patients to nivolumab and 453 patients to ipilimumab. Baseline characteristics were balanced. Approximately 81% of patients had stage III disease, 32% had ulcerated primary melanoma, 48% had macroscopic lymph node involvement, 62% had less than a 5% PD-L1 expression, and 42% harbored BRAF mutations.

    • The European Organisation for Research and Treatment of Cancer (EORTC) Independent Data Monitoring Committee stopped the study at the protocol-specified interim analysis, when all patients had a minimum follow-up of 18 months, at which time there were 360 events of RFS. The median RFS has not been reached in either treatment group. At 12 months, the rate of RFS for patients treated with nivolumab was 70.5% (95% confidence interval [CI], 66.1%–74.0%) versus 60.8% (95% CI, 56.0%–65.2%) in patients treated with ipilimumab. Recurrence or death occurred in 34% (154 of 453) of patients treated with nivolumab versus 45.5% (206 of 453) of patients treated with ipilimumab (hazard ratio [HR] recurrence or death, 0.65; 97.56% CI, 0.51–0.83; P < .001). Subgroup analyses of RFS favored nivolumab regardless of PD-L1 expression or BRAF V600 mutation.
    • Patients treated with nivolumab had fewer adverse events (AEs), including grade 3 to 4 serious AEs and death. Nivolumab was discontinued in 9.7% of patients, and ipilimumab was discontinued in 42.6% of patients because of AEs. Two treatment-related deaths occurred among patients treated with ipilimumab (e.g., marrow aplasia and colitis) and none occurred among the patients treated with nivolumab. The AE profile was like the type of checkpoint inhibitor toxicities seen in the metastatic setting, with immune-related events most commonly seen in the gastrointestinal system, hepatic system, and skin. Grade 3 or 4 AEs occurred in 14% of patients treated with nivolumab and in 46% of patients treated with ipilimumab.
    • An updated analysis, after a minimum of 4 years of follow-up, showed an RFS of 51.7% (95% CI, 46.8%–56.3%) for patients who received nivolumab versus 41.2% (95% CI, 36.4%–45.9%) for patients who received ipilimumab (HR relapse or death, 0.71; 95% CI, 0.60–0.86; P = .0003). Median OS has not been reached in either group.[24]
Pembrolizumab

Evidence (pembrolizumab):

  1. In a multinational, randomized, double-blind trial (MK-3475-054/KEYNOTE-054 [NCT02362594]), patients with completely resected stage IIIA, IIIB, or IIIC melanoma were randomly assigned (1:1) to receive pembrolizumab or placebo.[21][Level of evidence B1] The primary end point was RFS, defined as time from randomization until the date of first recurrence or death from any cause. If recurrence was documented, patients could cross over or repeat treatment with pembrolizumab. Pembrolizumab was given as an IV infusion of 200 mg every 3 weeks, for a total of 18 doses (approximately 1 year).

    A total of 1,019 patients were randomly assigned: 514 to pembrolizumab and 505 to placebo. Baseline characteristics were balanced. Approximately 40% had ulcerated primary melanoma, 66% had macroscopic lymph node involvement, 84% had positive PD-L1 expression (melanoma score >2 by 22C3 antibody assay), and 44% harbored BRAF mutations.

    • The EORTC Independent Data Monitoring Committee reviewed the unblinded results at an amended interim analysis when 351 events (recurrences or deaths) had occurred. The results were positive, and the interim analysis of RFS became the final analysis.
    • At the amended interim analysis with a median follow-up of 15 months, the 12-month rate of RFS was 75.4% (95% CI, 71.3%–78.9%) in the pembrolizumab group versus 61.0% (95% CI, 56.5%–65.1%) in the placebo group.
    • An update of the primary end point of RFS with a median follow-up 3.5 years showed 59.8% (95% CI, 55.3%–64.1%) RFS in the pembrolizumab group versus 41.4% (95% CI, 39.2%–48.8%) in the placebo group (HR, 0.59; 95% CI, 0.49–0.73).[25]
    • Pembrolizumab maintained its effect regardless of PD-L1 positive or negative expression or BRAF mutation status.
    • Approximately 14% of patients discontinued pembrolizumab due to an AE. Grade 3, 4, or 5 AEs considered to be related to pembrolizumab occurred in 15% of patients. There was one death due to treatment (myositis).
Ipilimumab

Evidence (ipilimumab):

  1. The open-label, three-arm, North American Intergroup trial E1609 (NCT01274338) compared two doses of ipilimumab with HDI as adjuvant therapy in high-risk patients with melanoma.[19] A total of 1,670 patients with resected disease (defined by the American Joint Committee on Cancer, 7th edition, as stage IIIB, IIIC, M1a, or M1b) were randomly assigned (1:1:1) to ipilimumab 3 mg/kg (ipi3) or ipilimumab 10 mg/kg (ipi10) every 3 weeks for four doses (induction), followed by the same dose every 12 weeks for four doses (maintenance), or HDI 20 million units/m2 per day, 5 days per week for 4 weeks (induction), followed by 10 million units/m2 daily subcutaneously every other day, 3 days per week for 48 weeks (maintenance).[19][Level of evidence A1]

    The trial was designed with two coprimary end points, RFS and OS, with a hierarchic analysis to evaluate ipi3 versus HDI followed by ipi10 versus HDI. The time to event was longer than anticipated and the design was amended for a final analysis at a data cutoff date giving a median follow-up time of 57.4 months (range, 0.03 months−86.6 months).

    • Ipi3 significantly improved OS compared with HDI (HR, 0.78; 95% repeated CI, 0.61−0.99; P = .044), but not RFS (HR, 0.85; 95% CI, 0.66−1.09; P = .065).
    • Ipi10 did not significantly improve OS or RFS compared with HDI (HR, 0.88; 95.6% CI, 0.69−1.12 and exploratory HR, 0.84; 99.4% CI, 0.65−1.09, respectively).
    • Salvage treatments were used in 69.7% of patients after ipi3, 51.6% of patients after ipi10, and 86.2% of patients after HDI.

    Toxicity with ipi3 was lower than with ipi10; however, both had treatment-related discontinuations and death.

    • Treatment-related discontinuations were 34.9% in the ipi3 group and 54.1% in the ipi10 group.
    • There were three possibly treatment-related deaths in the ipi3 group, five in the ipi10 group, and two in the HDI group.

    The study concluded that evidence no longer supports a role for HDI as adjuvant therapy for patients with high-risk melanoma. Further, ipi3 provides OS data superior to ipi10 compared with HDI. The role of ipilimumab as adjuvant monotherapy is unclear because CheckMate 238 demonstrated that nivolumab was superior to ipi10 in improving RFS, with OS data still maturing.

  2. In a multinational, randomized, double-blind trial (EORTC 18071 [NCT00636168]), patients with stage III melanoma, who had complete resection, were randomly assigned (1:1) to receive ipilimumab or placebo.[26][Level of evidence B1] Patients with lymph node metastasis larger than 1 mm, in-transit metastasis, resection occurring more than 12 weeks before randomization, autoimmune disease, previous or concurrent immunosuppressive therapy, previous systemic therapy for melanoma, and an ECOG PS score of greater than 1 were excluded. The ipilimumab dose was 10 mg/kg every 3 weeks for four doses, then every 3 months for up to 3 years. The primary end point was RFS, defined as recurrence or death (regardless of cause), whichever came first, as assessed by an independent review committee.
    • A total of 951 patients were enrolled (475 patients to the ipilimumab arm and 476 patients to the placebo arm). The median age was 51 years, and 94% of the patients had a PS of 0.
    • At a median follow-up of 2.7 years, there were 528 RFS events: 234 in the ipilimumab group (49%; 220 recurrences, 14 deaths) and 294 in the placebo group (62%; 289 recurrences, 5 deaths). Median RFS was 26 months for the ipilimumab group (95% CI, 19–39) versus 17 months for the placebo group (95% CI, 13–22). The HR was 0.75 (95% CI, 0.64–0.90; P < .002). The effect of ipilimumab was consistent across subgroups.
    • Ipilimumab was discontinued for AEs in 52% of the patients. Patients received ipilimumab for a median of four doses; 36% of patients in the ipilimumab group stayed on treatment for more than 6 months, and 26% stayed on treatment for more than 1 year. Five patients died from drug-related events: three secondary to colitis, one with myocarditis, and one of multiorgan failure with Guillain-Barré syndrome. The most common AEs were gastrointestinal, hepatic, and endocrine in nature and included rash, fatigue, and headache.

    An updated analysis was performed at a median follow-up of 5.3 years.[18]

    • The 5-year rate of RFS was 40.8% in patients treated with ipilimumab and 30.3% in patients who received the placebo (HR recurrence or death, 0.76; 95% CI, 0.64–0.89; P < .001) and the median RFS was 27.6% in patients treated with ipilimumab and 17.1% in patients who received the placebo.
    • The rate of OS, a secondary end point, at 5 years was 65.4% in patients treated with ipilimumab versus 54.4% in patients who received the placebo (HRdeath, 0.72; 95.1% CI, 0.58–0.88; P = .001).

Data from this trial (EORTC 18071), which tested high-dose ipilimumab at 10 mg/kg compared with placebo, served as the basis for the approval of ipilimumab in the adjuvant setting. However, the subsequent intergroup trial, E1609 (described above), demonstrated better outcomes with low-dose (3 mg/kg) ipilimumab, which is also the dose approved for metastatic disease.

Combination signal transduction inhibitors
Dabrafenib plus trametinib

Evidence (dabrafenib plus trametinib):

  1. In a multinational, randomized, double-blind trial (COMBI-AD [NCT01682083]), patients with stage IIIA, IIIB, or IIIC melanoma with BRAF V600E or V600K mutations who underwent completion lymphadenectomy were randomly assigned (1:1) to receive either dabrafenib plus trametinib or two matched placebo tablets.[22][Level of evidence B1] The primary end point of RFS was defined as time from randomization until the date of first recurrence or death from any cause. Patients with resection occurring more than 12 weeks before random assignment and an ECOG PS score of greater than 1 were excluded. Dabrafenib was given at a dose of 150 mg twice daily plus trametinib at a dose of 2 mg once daily (combination therapy) for 12 months in the absence of disease recurrence, unacceptable toxic effects, or death. A total of 870 patients were randomly assigned (438 patients to combination therapy and 432 patients to placebo). Baseline characteristics were balanced. Most patients (91%) harbored the V600E mutation compared with 9% who harbored the V600K mutation. Most patients (92%) had an ECOG PS of 0.
    • At the data cutoff date for the primary analysis, the minimum follow-up was 2.5 years (median, 2.8 years), and all patients had completed trial treatment. Disease recurrence was reported in 163 of 438 patients (37%) who received combination therapy and in 247 of 432 patients (57%) who received placebo (HRrelapse or death, 0.47; 95% CI, 0.39–0.58; P < .001). Median RFS had not been reached in the combination arm (95% CI, 44.5–not reached) and was 16.6 months (95% CI, 12.7–22.1) in the placebo group.
    • In the combination therapy arm, 26% of the patients had an AE leading to the discontinuation of therapy, 38% of the patients required dose reduction, and 66% of the patients required dose interruption. In the placebo arm, 3% of the patients had an AE leading to discontinuation of therapy, 3% of the patients required dose reduction, and 15% of the patients required dose interruption. Serious AEs occurred in 36% of the patients who received the combination therapy and 10% of the patients in the placebo group. One death, which resulted from pneumonia, was reported in the combination therapy arm.
    • An updated analysis performed at 5 years, after a minimum duration of 59 months of follow-up, showed superior RFS for patients who received the dabrafenib plus trametinib combination compared with patients who received placebo, with 52% (95% CI, 48%–58%) of patients who received the dabrafenib plus trametinib combination alive without relapse versus 36% (95% CI, 32%–41%) of patients who received placebo alive without relapse (HRrelapse or death, 0.51; 95% CI, 0.42–0.61). Data are not mature for OS.[27]

Treatment Options Under Clinical Evaluation for Resectable Stage III Melanoma

Treatment options under clinical evaluation for patients with resectable stage III melanoma include the following:

  1. Trials of combination immunotherapies, including vaccines.
  2. Trials of adjuvant therapies that target a known mutation, e.g., c-KIT.
  3. Intralesional therapies.

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

References
  1. Veronesi U, Cascinelli N: Narrow excision (1-cm margin). A safe procedure for thin cutaneous melanoma. Arch Surg 126 (4): 438-41, 1991. [PUBMED Abstract]
  2. Veronesi U, Cascinelli N, Adamus J, et al.: Thin stage I primary cutaneous malignant melanoma. Comparison of excision with margins of 1 or 3 cm. N Engl J Med 318 (18): 1159-62, 1988. [PUBMED Abstract]
  3. Wagner JD, Gordon MS, Chuang TY, et al.: Current therapy of cutaneous melanoma. Plast Reconstr Surg 105 (5): 1774-99; quiz 1800-1, 2000. [PUBMED Abstract]
  4. Cohn-Cedermark G, Rutqvist LE, Andersson R, et al.: Long term results of a randomized study by the Swedish Melanoma Study Group on 2-cm versus 5-cm resection margins for patients with cutaneous melanoma with a tumor thickness of 0.8-2.0 mm. Cancer 89 (7): 1495-501, 2000. [PUBMED Abstract]
  5. Balch CM, Soong SJ, Smith T, et al.: Long-term results of a prospective surgical trial comparing 2 cm vs. 4 cm excision margins for 740 patients with 1-4 mm melanomas. Ann Surg Oncol 8 (2): 101-8, 2001. [PUBMED Abstract]
  6. Heaton KM, Sussman JJ, Gershenwald JE, et al.: Surgical margins and prognostic factors in patients with thick (>4mm) primary melanoma. Ann Surg Oncol 5 (4): 322-8, 1998. [PUBMED Abstract]
  7. Balch CM, Urist MM, Karakousis CP, et al.: Efficacy of 2-cm surgical margins for intermediate-thickness melanomas (1 to 4 mm). Results of a multi-institutional randomized surgical trial. Ann Surg 218 (3): 262-7; discussion 267-9, 1993. [PUBMED Abstract]
  8. Shen P, Wanek LA, Morton DL: Is adjuvant radiotherapy necessary after positive lymph node dissection in head and neck melanomas? Ann Surg Oncol 7 (8): 554-9; discussion 560-1, 2000. [PUBMED Abstract]
  9. Hochwald SN, Coit DG: Role of elective lymph node dissection in melanoma. Semin Surg Oncol 14 (4): 276-82, 1998. [PUBMED Abstract]
  10. Cascinelli N, Morabito A, Santinami M, et al.: Immediate or delayed dissection of regional nodes in patients with melanoma of the trunk: a randomised trial. WHO Melanoma Programme. Lancet 351 (9105): 793-6, 1998. [PUBMED Abstract]
  11. Koops HS, Vaglini M, Suciu S, et al.: Prophylactic isolated limb perfusion for localized, high-risk limb melanoma: results of a multicenter randomized phase III trial. European Organization for Research and Treatment of Cancer Malignant Melanoma Cooperative Group Protocol 18832, the World Health Organization Melanoma Program Trial 15, and the North American Perfusion Group Southwest Oncology Group-8593. J Clin Oncol 16 (9): 2906-12, 1998. [PUBMED Abstract]
  12. Wong SL, Balch CM, Hurley P, et al.: Sentinel lymph node biopsy for melanoma: American Society of Clinical Oncology and Society of Surgical Oncology joint clinical practice guideline. J Clin Oncol 30 (23): 2912-8, 2012. [PUBMED Abstract]
  13. Kirkwood JM, Strawderman MH, Ernstoff MS, et al.: Interferon alfa-2b adjuvant therapy of high-risk resected cutaneous melanoma: the Eastern Cooperative Oncology Group Trial EST 1684. J Clin Oncol 14 (1): 7-17, 1996. [PUBMED Abstract]
  14. Kirkwood JM, Ibrahim JG, Sondak VK, et al.: High- and low-dose interferon alfa-2b in high-risk melanoma: first analysis of intergroup trial E1690/S9111/C9190. J Clin Oncol 18 (12): 2444-58, 2000. [PUBMED Abstract]
  15. Eggermont AM, Suciu S, Santinami M, et al.: Adjuvant therapy with pegylated interferon alfa-2b versus observation alone in resected stage III melanoma: final results of EORTC 18991, a randomised phase III trial. Lancet 372 (9633): 117-26, 2008. [PUBMED Abstract]
  16. Hancock BW, Wheatley K, Harris S, et al.: Adjuvant interferon in high-risk melanoma: the AIM HIGH Study--United Kingdom Coordinating Committee on Cancer Research randomized study of adjuvant low-dose extended-duration interferon Alfa-2a in high-risk resected malignant melanoma. J Clin Oncol 22 (1): 53-61, 2004. [PUBMED Abstract]
  17. Chapman PB, Hauschild A, Robert C, et al.: Improved survival with vemurafenib in melanoma with BRAF V600E mutation. N Engl J Med 364 (26): 2507-16, 2011. [PUBMED Abstract]
  18. Eggermont AM, Chiarion-Sileni V, Grob JJ, et al.: Prolonged Survival in Stage III Melanoma with Ipilimumab Adjuvant Therapy. N Engl J Med 375 (19): 1845-1855, 2016. [PUBMED Abstract]
  19. Tarhini AA, Lee SJ, Hodi FS, et al.: Phase III Study of Adjuvant Ipilimumab (3 or 10 mg/kg) Versus High-Dose Interferon Alfa-2b for Resected High-Risk Melanoma: North American Intergroup E1609. J Clin Oncol 38 (6): 567-575, 2020. [PUBMED Abstract]
  20. Weber J, Mandala M, Del Vecchio M, et al.: Adjuvant Nivolumab versus Ipilimumab in Resected Stage III or IV Melanoma. N Engl J Med 377 (19): 1824-1835, 2017. [PUBMED Abstract]
  21. Eggermont AMM, Blank CU, Mandala M, et al.: Adjuvant Pembrolizumab versus Placebo in Resected Stage III Melanoma. N Engl J Med 378 (19): 1789-1801, 2018. [PUBMED Abstract]
  22. Long GV, Hauschild A, Santinami M, et al.: Adjuvant Dabrafenib plus Trametinib in Stage III BRAF-Mutated Melanoma. N Engl J Med 377 (19): 1813-1823, 2017. [PUBMED Abstract]
  23. Maio M, Lewis K, Demidov L, et al.: Adjuvant vemurafenib in resected, BRAFV600 mutation-positive melanoma (BRIM8): a randomised, double-blind, placebo-controlled, multicentre, phase 3 trial. Lancet Oncol 19 (4): 510-520, 2018. [PUBMED Abstract]
  24. Ascierto PA, Del Vecchio M, Mandalá M, et al.: Adjuvant nivolumab versus ipilimumab in resected stage IIIB-C and stage IV melanoma (CheckMate 238): 4-year results from a multicentre, double-blind, randomised, controlled, phase 3 trial. Lancet Oncol 21 (11): 1465-1477, 2020. [PUBMED Abstract]
  25. Eggermont AMM, Blank CU, Mandalà M, et al.: Adjuvant pembrolizumab versus placebo in resected stage III melanoma (EORTC 1325-MG/KEYNOTE-054): distant metastasis-free survival results from a double-blind, randomised, controlled, phase 3 trial. Lancet Oncol 22 (5): 643-654, 2021. [PUBMED Abstract]
  26. Eggermont AM, Chiarion-Sileni V, Grob JJ, et al.: Adjuvant ipilimumab versus placebo after complete resection of high-risk stage III melanoma (EORTC 18071): a randomised, double-blind, phase 3 trial. Lancet Oncol 16 (5): 522-30, 2015. [PUBMED Abstract]
  27. Dummer R, Hauschild A, Santinami M, et al.: Five-Year Analysis of Adjuvant Dabrafenib plus Trametinib in Stage III Melanoma. N Engl J Med 383 (12): 1139-1148, 2020. [PUBMED Abstract]

Treatment of Unresectable Stage III, Stage IV, and Recurrent Melanoma

Treatment Options for Unresectable Stage III, Stage IV, and Recurrent Melanoma

Treatment options for unresectable stage III, stage IV, and recurrent melanoma include the following:

  1. Intralesional therapy.
    1. Talimogene laherparepvec (T-VEC).
  2. Immunotherapy.
    1. Checkpoint inhibitors.
    2. High-dose interleukin-2 (IL-2).
    3. Dual checkpoint inhibition.
  3. Signal transduction inhibitors.
    1. BRAF inhibitors (for patients who test positive for the BRAF V600 mutation).
    2. Mitogen-activated protein kinase (MEK) inhibitors.
    3. KIT inhibitors.
    4. Combination therapy with signal transduction inhibitors.
    5. Combination signal transduction inhibitor therapy plus PD-L1 inhibitor.
  4. Chemotherapy.
  5. Palliative local therapy.

Two approaches—checkpoint inhibition and targeting the mitogen-activated protein kinase (MAPK) pathway—demonstrated improvement in progression-free survival (PFS) and overall survival (OS) in randomized trials. Anti–PD-1 monotherapy (pembrolizumab or nivolumab) demonstrated improved efficacy outcomes with better safety profiles when compared with treatment using single-agent anti–CTLA-4 (ipilimumab) or investigator choice of chemotherapy. The combination of anti–PD-1 and anti–CTLA-4 immunotherapies (nivolumab and ipilimumab) also prolongs PFS and OS compared with ipilimumab, but the combination is associated with significant toxicity. The efficacy seen with immunotherapy is independent of BRAF mutation status.

Combinations of BRAF and MEK inhibitors have consistently shown superior efficacy compared with BRAF monotherapy. Improved PFS was seen when a PD-L1 inhibitor (atezolizumab) was added to the combination of a BRAF plus MEK inhibitor (vemurafenib plus cobimetinib); however, data on OS is immature. Further questions remain regarding triplet therapy, including how it compares with monotherapy checkpoint inhibition and if the concurrent administration is superior to sequential therapy (NCT02224781).

Because of the rapid development of new agents, combinations, and remaining questions, patients and their physicians are encouraged to consider a clinical trial for initial treatment and at the time of progression. Clinical trials are addressing the following issues:

  • The value of sequencing therapies, such as immunotherapy and targeted therapy.
  • Optimal doses for combination immunotherapy to decrease toxicity and preserve efficacy.
  • How to select the patients who will benefit from combination immunotherapy versus monotherapy.
  • The role of PD-L1 expression as a biomarker for efficacy.
  • The role of maintenance therapy.

Intralesional therapy

Talimogene laherparepvec (T-VEC)

T-VEC is a genetically modified, herpes simplex virus type 1 (HSV1) oncolytic therapy approved for local intralesional injection into unresectable cutaneous, subcutaneous, and nodal lesions in patients with melanoma that recurs after initial surgery. T-VEC is designed to replicate within tumors, causing lysis, and to produce granulocyte-macrophage colony-stimulating factor (GM-CSF). Release of antigens together with virally derived GM-CSF may promote an antitumor immune response; however, the exact mechanism of action is unknown.

The approval of T-VEC by the U.S. Food and Drug Administration (FDA) is based on data that demonstrated shrinkage of lesions. However, improvement of OS or an effect on visceral metastases or improvement in quality of life has not been shown.

Evidence (T-VEC):

  1. In a multinational, randomized, open-label trial (NCT00769704), 436 patients were randomly assigned 2:1 to intralesional T-VEC or subcutaneous GM-CSF for at least 6 months or until there were no more injectable lesions.[1][Level of evidence B3] Eligible patients had stage IIIB, IIIC, and IV melanoma with unresectable, bidimensionally measurable lesions. The primary end point was durable response rate (DRR) (complete response [CR] or partial response [PR] lasting for >6 months) as assessed by independent review. The study was stratified by site of first recurrence, presence of liver metastases, disease stage, and previous nonadjuvant systemic treatment.
    • The median patient age was 63 years (range 22–94 years), 70% of patients had a baseline Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) score of 0, 30% had stage III disease, and 70% had stage IV disease (27% M1a; 21% M1b; and 22% M1c). Previous therapy for melanoma had been received by 53% of the patients.
    • The first dose only was administered at 106 plaque-forming units (pfu)/mL to a maximum of 4 mL for all lesions combined. Subsequent doses were administered at 8 pfu/mL up to 4.0 mL for all injected lesions combined with the injected volume based on the size of the lesion. Injection into visceral lesions was not allowed.
    • In patients treated with T-VEC, 16% (95% confidence interval [CI], 12.0%–20.5%) had a DRR versus 2% (95% CI, 0%–4.5%) in patients who received GM-CSF. Subgroup analysis suggests that the differences in DRRs between T-VEC versus GM-CSF may be greater in earlier-stage disease and treatment-naïve disease. Patients with stage IIIB and IIIC had a 33% DRR with T-VEC versus 0% with GM-CSF; 16% versus 2%, respectively in patients with stage IV M1a disease; 3% versus 4%, respectively in patients with stage IV M1b disease; and, 8% versus 3%, respectively in patients with stage IV M1c disease. Patients treated with T-VEC or GM-CSF as first-line therapy had a DRR of 24% versus 0%; however, patients who received treatment as second-line therapy or greater had a DRR of 10% versus 4%.
    • The median duration of exposure to T-VEC was 23 weeks (5.3 months) with 26 patients exposed for more than 1 year. The most common adverse events (AEs) in the T-VEC group were fatigue (50%), chills (49%), pyrexia (43%), nausea (36%), influenza-like illness (30%), and injection site pain. The rate of discontinuation resulting from toxicity to T-VEC was 4% versus 2% in the GM-CSF group. Of the ten deaths in patients treated with T-VEC, eight deaths were considered the result of PD-1, salmonella infection, and one myocardial infarction; none were considered related to therapy, based on findings of the investigator.

Precautions: T-VEC is a live, attenuated HSV and may cause life-threatening, disseminated herpetic infection. It is contraindicated in immunocompromised or pregnant patients. Health care providers and close contacts should avoid direct contact with injected lesions. Biohazard precautions for preparation, administration, and handling are provided in the label.

Detailed prescribing information by treatment cycle and lesion size are provided in the FDA label.

Immunotherapy

Checkpoint inhibitors
Anti–PD-1 and PD-L1

The PD-1 pathway is a key immunoinhibitory mediator of T-cell exhaustion. Blockade of this pathway can lead to T-cell activation, expansion, and enhanced effector functions. PD-1 has two ligands, PD-L1 and PD-L2. Two anti–PD-1 antibodies, pembrolizumab and nivolumab, were approved by the FDA on the basis of improved OS in randomized trials.

Pembrolizumab

Evidence (pembrolizumab):

  1. Previously treated patients. A total of 173 patients with unresectable or metastatic melanoma with disease progression within 24 weeks of the last dose of ipilimumab and, if BRAF V600 mutation−positive, previous treatment with a BRAF inhibitor, were randomly assigned to one of two doses of pembrolizumab—2 mg/kg or 10 mg/kg—every 3 weeks. The trial excluded patients with an autoimmune disease, a condition requiring immunosuppression, or a history of severe immune-related adverse events (irAEs) from treatment with ipilimumab.
    • The median age was 61 years; 60% were male; 67% had an ECOG PS score of 0, and 33% had an ECOG PS of 1. Eighteen percent of patients had tumors that were BRAF V600 mutation−positive, 39% had an elevated lactate dehydrogenase (LDH), 64% had M1c disease, 9% had brain metastases, and 72% had undergone two or more therapies for advanced disease. The primary outcome measure was overall response rate according to Response Evaluation Criteria In Solid Tumors (RECIST, version 1.1) criteria as assessed by blinded independent central review.[2][Level of evidence B3]
    • The overall response rate determined by independent central review was 26% (95% CI, -14–13; P = .96) in the 2 mg/kg arm, consisting of one CR and 20 PRs in 81 patients. Median follow-up was 8 months, and all patients had a minimum of 6 months of follow-up. Among the 21 patients with an objective response, 18 had ongoing responses, ranging from 1.4+ months to 8.5+ months.
    • Response rate in the 10 mg/kg arm was similar at 26%, consisting of 20 responses in 76 patients. Responses were seen in patients with and without BRAF V600 mutations.
    • The approved dose was 2 mg/kg administered as an intravenous (IV) infusion for 30 minutes every 3 weeks.

    Pembrolizumab was discontinued because of AEs in 7% of the patients treated with 2 mg/kg, with 3% considered drug-related AEs by the investigators. The most common AEs in the 2 mg/kg versus 10 mg/kg arms were the following:

    • Fatigue (33% vs. 37%).
    • Pruritus (23% vs. 19%).
    • Rash (18% vs. 18%).

    Other common AEs included cough, nausea, decreased appetite, constipation, arthralgia, and diarrhea. The most frequent and serious AEs that occurred in more than 2% of a total of 411 patients treated with pembrolizumab included renal failure, dyspnea, pneumonia, and cellulitis. Additional clinically significant irAEs included pneumonitis, colitis, hypophysitis, hyperthyroidism, hypothyroidism, nephritis, and hepatitis.

    The FDA label provides recommendations for suspected irAEs, including withholding the drug and administering corticosteroids.

  2. Previously untreated and treated patients. A multicenter, international trial (KEYNOTE 006 [NCT01866319]) randomly assigned 834 patients with metastatic melanoma in a 1:1:1 ratio to receive pembrolizumab (10 mg/kg IV every 2 weeks or every 3 weeks) or four cycles of ipilimumab (3 mg/kg every 3 weeks).[3] Patients were stratified by ECOG PS (0 vs. 1), line of therapy (first-line vs. second-line), and PD-L1 expression (positive vs. negative). The primary end points were PFS and OS.[3][Level of evidence A1]

    Approximately 66% of patients had received no previous systemic therapy for advanced melanoma. BRAF V600 mutations were present in 36% of patients and of these, approximately 50% had received previous BRAF inhibitor treatments. The study did not enroll patients with BRAF V600 mutations with high LDH levels and symptomatic or rapidly progressive disease who had not received anti-BRAF therapy, which could provide rapid clinical benefit. Approximately 80% of patients had PD-L1–positive tissue samples.

    • The final protocol-specified analysis of OS was conducted at a median follow-up of 23 months. Median OS was not reached in either pembrolizumab group; however, OS was 16.0 months for the ipilimumab group (hazard ratio [HR], 0.68; 95% CI, 0.53−0.87 for pembrolizumab every 2 weeks vs. ipilimumab; P = .0009 and 0.68; 95% CI, 0.53−0.86 for pembrolizumab every 3 weeks vs. ipilimumab; P = .0008). Survival rate at 24 months was 55% in the groups who received pembrolizumab every 2 weeks and every 3 weeks compared with 43% in the ipilimumab group.[4]
    • Benefit was seen across all subgroups except for patients with PD-L1–negative tumors. However, since this subset was small (18% of patients) and the CI was wide, no definitive conclusions could be drawn from this study.
Nivolumab

Evidence (nivolumab):

  1. Previously treated patients. Accelerated approval was based on a planned noncomparative interim analysis of the first 120 patients who received nivolumab with at least 6 months' follow-up from a multicenter, open-label trial (CheckMate 037 [NCT01721746]) that randomly assigned patients (2:1) to nivolumab (3 mg/kg every 2 weeks) or the investigator’s choice of chemotherapy (either dacarbazine 1,000 mg/m2 IV every 3 weeks or the combination of carboplatin [area under the curve 6] every 3 weeks plus paclitaxel 175 mg/m2 every 3 weeks).[FDA label][Level of evidence C3] Patients were required to have unresectable or metastatic melanoma that had progressed after treatment with ipilimumab and, if BRAF V600 mutation−positive, a BRAF inhibitor. The trial excluded patients with an autoimmune disease, a condition requiring immunosuppression, or a history of severe irAEs from treatment with ipilimumab.
    • Median age of patients was 58 years; 65% of patients were male; and, ECOG PS was 0 in 58% of patients. BRAF V600 mutation was present in 22% of patients; 76% had M1c disease; 56% had an elevated LDH; 18% had a history of brain metastases; and, 68% had received two or more systemic therapies previously for metastatic disease.
    • Objective response rate and OS were coprimary end points. The objective response rate was 32% (95% CI, 23%–41%) with four CRs and 34 PRs as assessed by RECIST 1.1 criteria and an independent central review. Among the 38 patients with responses, 33 (87%) had ongoing responses with durations from 2.6+ to 10.0+ months.
    • Responses were seen in patients with and without BRAF V600 mutations.
    • Safety analysis is based on 268 patients. Nivolumab was discontinued because of AEs in 9% of patients. Serious AEs occurred in 41% of patients and grade 3 and grade 4 AEs occurred in 42% of patients. The most common AEs were rash, cough, upper respiratory tract infection, and peripheral edema. Other important AEs included ventricular arrhythmia, iridocyclitis, increased amylase and lipase, dizziness, and neuropathy.

    The FDA label provides recommendations for suspected irAEs, including withholding the drug and administering corticosteroids.

  2. Previously untreated patients. A total of 418 patients with unresectable stage III or stage IV melanoma without a BRAF mutation were randomly assigned (1:1) in a double-blind multicenter trial (CheckMate 066 [NCT01721772]) to receive nivolumab (3 mg/kg every 2 weeks) and a dacarbazine-matched placebo (every 3 weeks) or dacarbazine (1,000 mg/m2 every 3 weeks with a nivolumab-matched placebo every 2 weeks). The primary end point was OS.[5][Level of evidence A1] The trial was conducted in 80 centers in Europe, Israel, Australia, Canada, and South America, which are countries where dacarbazine had been a standard first-line treatment in patients without a BRAF mutation.
    • The Data and Monitoring Safety Board (DMSB) noted a potential difference in OS during safety review. On June 10, 2014, an abbreviated report from an unplanned interim–database lock was reviewed showing a significant difference in OS in favor of nivolumab. The DMSB recommended that the study be unblinded and allow patients on dacarbazine to receive nivolumab. The intended sample size was approximately 410 patients; a total of 418 patients had been entered.
    • Results from the double-blind portion of the study before the crossover amendment showed that median OS was not reached in the nivolumab group and was 10.8 months (95% CI, 9.3–12.1) in the dacarbazine group. The OS rate at 1 year was 72.9% (95% CI, 65.%–78.9%) in the nivolumab group and 42.1% (95% CI, 33.0%–50.9%) in the dacarbazine group. The HRdeath was 0.42; 99.79% CI, 0.25–0.73; P < .001.
    • The most common AEs in the nivolumab group were fatigue (19.9%), pruritus (17%), nausea (16.5%), and diarrhea (16%). In the nivolumab group, 6.8% of patients discontinued study treatment because of AEs compared with 11.7% of patients discontinuing study treatment in the dacarbazine group. AEs with potential immunological etiology that occurred included gastrointestinal, hepatic, pulmonary, renal, endocrine, and skin; however, the majority resolved with a delay in study treatment, glucocorticoid administration, or both per management guidelines for nivolumab. No deaths were attributed to drug-related AEs in either group.
  3. Change in dosing regimen for nivolumab in metastatic melanoma.
    • In a population pharmacokinetic response analysis and a dose/exposure-response analysis, the flat dose of 240 mg of nivolumab every 2 weeks was considered pharmacokinetically equivalent to the dosing regimen of 3 mg/kg. Clinical safety and efficacy at the two doses appeared similar across body weight and tumor types in melanoma, non-small cell lung cancer, and renal cell carcinoma.[6]
    • The dosing regimen approved by the FDA for monotherapy has changed from 3 mg/kg to 240 mg IV every 2 weeks until disease progression or intolerable toxicity. The dosing regimen of 1 mg/kg of IV nivolumab when combined with ipilimumab will remain unchanged until after therapy with ipilimumab is complete, when the regimen will change to a 240 mg dose every 2 weeks until disease progression or intolerable toxicity.
Anti–cytotoxic T-lymphocyte antigen-4 (CTLA-4)
Ipilimumab

Ipilimumab is a human monoclonal antibody that binds to CTLA-4, thereby blocking its ability to downregulate T-cell activation, proliferation, and effector function.

Approved by the FDA in 2011, ipilimumab has demonstrated clinical benefit by prolonging OS in randomized trials. Two prospective, randomized, international trials, one each in previously untreated and treated patients, supported the use of ipilimumab.[7,8]

Evidence (ipilimumab):

  1. Previously treated patients: A total of 676 patients with previously treated, unresectable stage III or stage IV disease, and who were HLA-A*0201-positive, entered into a three-arm, multinational, randomized (3:1:1), double-blind, double-placebo trial. A total of 403 patients were randomly assigned to receive ipilimumab (3 mg/kg every 3 weeks for 4 doses) with glycoprotein 100 (gp100) peptide vaccine. One hundred thirty-seven patients received ipilimumab (3 mg/kg every 3 weeks for 4 doses), and 136 patients received the gp100 vaccine. Patients were stratified by baseline metastases and previous receipt or nonreceipt of IL-2 therapy. Eighty-two of the patients had metastases to the brain at baseline.[8][Level of evidence A1]
    • The median OS was 10 months among patients who received ipilimumab alone and 10.1 months among those who received ipilimumab with the gp100 vaccine, compared with 6.4 months for patients who received the vaccine alone (HR of ipilimumab alone vs. gp100 alone, 0.66; P < .003; HR of ipilimumab plus vaccine vs. gp100 alone, 0.68; P < .001).
    • An analysis at 1 year showed that among patients treated with ipilimumab, 44% of those treated with ipilimumab and 45% of those treated with ipilimumab and the vaccine were alive, compared with 25% of the patients who received the vaccine only.
    • Grade 3 or grade 4 irAEs occurred in 10% to 15% of patients treated with ipilimumab. These irAEs most often included diarrhea or colitis, and endocrine-related events (e.g., inflammation of the pituitary). These events required cessation of therapy and institution of anti-inflammatory agents such as corticosteroids or, in four cases, infliximab (an antitumor necrosis factor-alpha antibody).
    • There were 14 drug-related deaths (2.1%), and seven deaths were associated with irAEs.
  2. Previously untreated patients: A multicenter, international trial randomly assigned 502 patients untreated for metastatic disease (adjuvant treatment was allowed) in a 1:1 ratio to receive ipilimumab (10 mg/kg) plus dacarbazine (850 mg/m2) or placebo plus dacarbazine (850 mg/m2) at weeks 1, 4, 7, and 10 followed by dacarbazine alone every 3 weeks through week 22. Patients with stable disease or an objective response and no dose-limiting toxic effects received ipilimumab or placebo every 12 weeks thereafter as maintenance therapy. The primary end point was survival. Patients were stratified according to ECOG PS and metastatic stage. Approximately 70% of the patients had an ECOG PS of 0, and the remainder of the patients had an ECOG PS of 1. Approximately 55% of patients had stage M1c disease.[7][Level of evidence A1]
    • The median OS was 11.2 months (95% CI, 9.4–13.6) for the ipilimumab-dacarbazine group versus 9.1 months (95% CI, 7.8–10.5) for the placebo-dacarbazine group. Estimated survival rates in the ipilimumab-dacarbazine group were 47.3% at 1 year, 28.5% at 2 years, and 20.8% at 3 years (HRdeath, 0.72; P < .001); and in the placebo-dacarbazine group, the rates were 36.3% at 1 year, 17.9% at 2 years, and 12.2% at 3 years.
    • The most common study-drug–related AEs were those classified as immune related. Grade 3 or grade 4 irAEs were seen in 38.1% of patients treated with ipilimumab plus dacarbazine versus 4.4% of patients treated with placebo plus dacarbazine, the most common events were hepatitis and enterocolitis.
    • No drug-related deaths occurred.

Clinicians and patients should be aware that immune-mediated adverse reactions may be severe or fatal. Early identification and treatment are necessary, including potential administration of systemic glucocorticoids or other immunosuppressants according to the immune-mediated adverse reaction management guide provided by the manufacturer.[9]

High-dose IL-2

IL-2 was approved by the FDA in 1998 because of durable CRs in eight phase I and II studies. Phase III trials comparing high-dose IL-2 to other re-treatments, providing an assessment of relative impact on OS, have not been conducted.

Evidence (high-dose IL-2):

  1. Based on a pooled analysis of 270 patients from eight single- and multi-institutional trials in 22 institutions conducted between 1985 and 1993:
    • High-dose IL-2 demonstrated a 6% to 7% CR rate.[10]
    • With a median follow-up time for surviving patients of at least 7 years, the median duration of CRs was not reached but was at least 59 months.[11]

Strategies to improve this therapy are an active area of investigation.

Dual checkpoint inhibition

T-cells coexpress several receptors that inhibit T-cell function. Preclinical data and early clinical data suggest that co-blockade of the two inhibitory receptors, CTLA-4 and PD-1, may be more effective than blockade of either alone.[12] This has led to a phase III trial (NCT01844505) comparing each single agent with the combination.

CTLA-4 inhibitor plus PD-1 inhibitor

Evidence (ipilimumab plus nivolumab):

  1. Previously untreated patients. In an international, randomized, double-blind trial (CheckMate 067), 945 previously untreated patients with unresectable stage III or IV melanoma were randomly assigned in a 1:1:1 ratio to receive the following:
    • Arm 1: nivolumab alone 3 mg/kg every 2 weeks plus placebo;
    • Arm 2: nivolumab (1 mg/kg every 3 weeks) plus ipilimumab (3 mg/kg every 3 weeks for 4 doses) followed by 3 mg of nivolumab every 2 weeks; or
    • Arm 3: ipilimumab alone (3 mg/kg every 3 weeks for 4 doses plus placebo).

    PFS and OS were coprimary end points. The study was powered to compare the combination of nivolumab plus ipilimumab with ipilimumab monotherapy, and nivolumab monotherapy with ipilimumab monotherapy; the study was not powered to compare combination ipilimumab plus nivolumab with nivolumab.

    Patients were stratified according to tumor PD-L1 status assessed in a central laboratory by immunohistochemical testing (positive vs. negative or indeterminate), BRAF mutation status (V600 mutation−positive vs. wild-type), and American Joint Committee on Cancer stage.[13][Level of evidence A1]

    1. Characteristics at baseline included 74% of patients with an ECOG PS of 0; 36% had elevated LDH; 31.5% had a BRAF mutation; and 58% had M1c disease. A minority of patients (23.6%) had a PD-L1–positive tumor.
    2. The prospectively defined coprimary analysis of PFS occurred after all patients had at least 9 months of follow-up. Treatment with nivolumab alone or in combination with ipilimumab resulted in significantly longer PFS than with ipilimumab alone. Results were consistent across the prespecified stratification factors. Median PFS was 6.9 months (95% CI, 4.3–9.5) with nivolumab, 11.5 months (95% CI, 8.9–16.7) with nivolumab plus ipilimumab, and 2.9 months (95% CI, 2.8–3.4) with ipilimumab.
    3. The prospectively specified coprimary analysis of OS was to occur at 28 months. With 467 deaths, the rate of OS at this time point was 59% in the nivolumab group, 64% in the combination group, and 45% in the ipilimumab group (HRdeath for the combination vs. ipilimumab, 0.55 [98% CI, 0.42–0.72; P< .001]; HRdeath with nivolumab vs. ipilimumab 0.63 [98% CI, 0.48–0.81; P< .001]).[14]
    4. In a descriptive analysis with a minimum follow-up of 36 months, the following data were found:
      • OS rates were 52% in the nivolumab group, 58% in patients treated with the combination, and 34% in the ipilimumab group.
      • The median OS was not reached in the combination arm (95% CI, 38.2 months–not reached). Median OS in the single-agent nivolumab and ipilimumab groups were 37.6 months (95% CI, 29.1–not reached) and 19.9 months (95% CI, 16.9–24.6), respectively.
      • The HRdeath for the combination versus ipilimumab was 0.55 (99.5% CI, 0.45–0.69; P < .001); for nivolumab versus ipilimumab, the HR was 0.65 (99.5% CI, 0.53–0.80; P < .001).
    5. AEs were highest in the combination arm and need to be monitored carefully. Grade 3 to 4 treatment-related AEs occurred in 16.3% of patients in the nivolumab group, 27.3% of patients in the ipilimumab group, and 55% of patients in the combination group. The most frequent reason for treatment discontinuation was disease progression in the two monotherapy arms—49% with nivolumab and 65% with ipilimumab. The most frequent reason for discontinuation in the combination group was toxicity (38%).
    6. Four therapy-related deaths were reported, which were attributed to neutropenia (nivolumab group), colon perforation (ipilimumab group), liver necrosis, and autoimmune myocarditis (combination ipilimumab and nivolumab).
    7. Analyses of PD-L1 expression level associated with OS at 3 years indicated that the level of expression alone is a poor predictive biomarker of OS.
  2. Melanoma metastatic to the brain. Patients with at least one measurable, nonirradiated brain metastasis were eligible for treatment with systemic dual immunotherapy in an open-label, multicenter phase II trial (CheckMate 204 [NCT02320058]).[15][Level of evidence C3] Eligibility required no need for immediate intervention, an absence of neurological signs or symptoms, and no glucocorticoids within 14 days of study treatment. Patients may have received previous stereotactic radiosurgery or excision of up to three brain metastases. Positive PD-L1 expression was not required.

    Treatment consisted of nivolumab (1 mg/kg) plus ipilimumab (3 mg/kg) every 3 weeks for up to 4 doses, followed by nivolumab (3 mg/kg) every 2 weeks until progression or unacceptable toxicity.

    The primary end point was rate of intracranial clinical benefit assessed by the investigator per RECIST criteria and defined as the percentage of patients with CR, PR, or stable disease for at least 6 months. A total of 28 sites in the United States enrolled 101 patients, of whom 94 had a minimum follow-up of 6 months; the data on that population are reported below.

    • Clinical benefit (in the brain) was seen in 57% of patients (95% CI, 47–68); 24 patients (26%) had a CR, 28 patients (30%) had a PR, and 2 patients (2%) had stable disease that lasted for 6 months or longer. Similar rates of objective response (50%) were seen in patients with extracranial lesions, although fewer patients had a CR (7%).
    • A subgroup analysis indicated responses in both PD-L1–positive and PD-L1–negative patients (baseline status not known in 20/94 patients).
    • The median follow-up of the 94 patients was 14 months. Median time to intracranial response was 2.3 months (range, 1.1−10.8), and time to extracranial response was 2.1 months (range, 1.1−15.0).
    • The most common treatment-related AE of any grade in the nervous system was headache (21 patients [22%]), with 3 patients (3%) having headache of grade 3 or 4. Other treatment-related neurological AEs of grade 3 or 4 were brain edema (2 patients [2%]), intracranial hemorrhage (1 patient [1%]), peripheral motor neuropathy (1 patient [1%]), and syncope (1 patient [1%]). Each of these AEs led to treatment discontinuation, and the one reported case of peripheral motor neuropathy was irreversible. One death was evaluated by the investigator as related to the study treatment (grade 5 immune-related myocarditis).
    • Progression was documented in 33 patients (35%); 17 patients (18%) had intracranial progression only, 4 patients (4%) had extracranial progression only, and 12 patients (13%) had progression in both intracranial and extracranial sites.

Signal transduction inhibitors

Studies to date indicate that both BRAF and MEK (mitogen-activated ERK-[extracellular signal-regulated kinase] activating kinase) inhibitors, as single agents and in combination, can significantly impact the natural history of melanoma, although they do not appear to provide a cure.

BRAF inhibitors

Treatment with BRAF inhibitors is discouraged in wild-type BRAF melanoma because data from preclinical models have demonstrated that BRAF inhibitors can enhance rather than downregulate the mitogen-activated protein kinase (MAPK) pathway in tumor cells with wild-type BRAF and upstream RAS mutations.[16-19]

Vemurafenib

Vemurafenib is an orally available, small-molecule, selective BRAF kinase inhibitor that was approved by the FDA in 2011 for patients with unresectable or metastatic melanoma who test positive for the BRAF V600E mutation.

Evidence (vemurafenib):

  1. Previously untreated patients: The approval of vemurafenib was supported by an international, multicenter trial (BRIM-3 [NCT01006980]) that screened 2,107 patients with previously untreated stage IIIC or IV melanoma for the BRAF V600 mutation and identified 675 patients via the cobas 4800 BRAF V600 Mutation Test.[20] Patients were randomly assigned to receive either vemurafenib (960 mg by mouth twice a day) or dacarbazine (1,000 mg/m2 IV every 3 weeks). Coprimary end points were rates of OS and PFS. At the planned interim analysis, the DMSB determined that both the OS and PFS end points had met the prespecified criteria for statistical significance in favor of vemurafenib and recommended that patients in the dacarbazine group be allowed to cross over to receive vemurafenib.[20][Levels of evidence A1 and B1]
    • A total of 675 patients were evaluated for OS; although the median survival had not yet been reached for vemurafenib and the data were immature for reliable Kaplan-Meier estimates of survival curves, the OS in the vemurafenib arm was clearly superior to that in the dacarbazine arm.
    • The HRdeath in the vemurafenib group was 0.37 (95% CI, 0.26–0.55; P < .001). The survival benefit in the vemurafenib group was observed in each prespecified subgroup, for example, age, sex, ECOG PS, tumor stage, LDH, and geographic region.
    • The HR for tumor progression in the vemurafenib arm was 0.26 (95% CI, 0.20–0.33; P < .001). The estimated median PFS was 5.3 months in the vemurafenib arm versus 1.6 months in the dacarbazine arm.
    • Twenty patients had non-BRAF V600E mutations: 19 with BRAF V600K and 1 with BRAF V600D. Four patients with a BRAF V600K mutation had a response to vemurafenib.
    • AEs required dose modification or interruption in 38% of patients who received vemurafenib and 16% of those who received dacarbazine. The most common AEs with vemurafenib were cutaneous events, arthralgia, and fatigue. Cutaneous squamous cell carcinoma (SCC), keratoacanthoma, or both developed in 18% of patients and were treated by simple excision. The most common AEs with dacarbazine were fatigue, nausea, vomiting, and neutropenia. For more information, see Fatigue and Nausea and Vomiting Related to Cancer Treatment.
  2. Previously treated patients: A total of 132 patients with a BRAF V600E or BRAF V600K mutation were enrolled in a multicenter phase II trial of vemurafenib, which was administered as 960 mg by mouth twice a day. Of the enrolled patients, 61% had stage M1c disease, and 49% had an elevated LDH level. All patients had received one or more previous therapies for advanced disease. Median follow-up was 12.9 months.[21][Level of evidence C3]
    • An independent review committee (IRC) reported a 53% response rate (95% CI, 44%–62%), with eight patients (6%) achieving CR.
    • Median duration of response per IRC assessment was 6.7 months (95% CI, 5.6–8.6). Most responses were evident at the first radiological assessment at 6 weeks; however, some patients did not respond until after receiving therapy for more than 6 months.
Dabrafenib

Dabrafenib is an orally available, small-molecule, selective BRAF inhibitor that was approved by the FDA in 2013. It is used for treatment of patients with unresectable or metastatic melanoma who test positive for the BRAF V600E mutation as detected by an FDA-approved test. Dabrafenib and other BRAF inhibitors are not recommended for treatment of BRAF wild-type melanomas, as in vitro experiments suggest there may be a paradoxical stimulation of MAPK signaling resulting in tumor promotion.

Evidence (dabrafenib):

  1. An international, multicenter trial (BREAK-3 [NCT01227889]) compared dabrafenib with dacarbazine. A total of 250 patients with unresectable stage III or IV melanoma and BRAF V600E mutations were randomly assigned in a 3:1 ratio (dabrafenib 150 mg by mouth every day or dacarbazine 1,000 mg/m2 IV every 3 weeks). IL-2 was allowed as a previous treatment for advanced disease. The primary end point was PFS; patients could cross over at the time of progressive disease after confirmation by a blinded IRC.[22][Level of evidence B1]
    • With 126 events, the HR for PFS was 0.30 (95% CI, 0.18–0.51; P < .0001). The estimated median PFS was 5.1 months for dabrafenib versus 2.7 months for dacarbazine. OS data are limited by the median duration of follow-up and crossover. The PR rate was 47% and the CR rate was 3% in patients who received dabrafenib versus a 5% PR rate and a 2% CR rate for those who received dacarbazine.
    • The most frequent AEs in patients treated with dabrafenib were cutaneous findings (i.e., hyperkeratosis, papillomas, palmar-plantar erythrodysesthesia), pyrexia, fatigue, headache, and arthralgia. Cutaneous SCC or keratoacanthoma occurred in 12 patients, basal cell carcinoma occurred in four patients, mycosis fungoides occurred in one patient, and new melanoma occurred in two patients.
MEK inhibitors
Trametinib

Trametinib is an orally available, small-molecule, selective inhibitor of MEK1 and MEK2. BRAF activates MEK1 and MEK2 proteins, which in turn, activate MAPK. Preclinical data suggest that MEK inhibitors can restrain growth and induce cell death of some BRAF-mutated human melanoma tumors.

In 2013, trametinib was approved by the FDA for patients with unresectable or metastatic melanoma with BRAF V600E or V600K mutations, as determined by an FDA-approved test.

Evidence (trametinib):

  1. A total of 1,022 patients were screened for BRAF mutations, resulting in 322 eligible patients (281 with BRAF V600E, 40 with BRAF V600K, and one with both mutations).[23] One previous treatment (biological or chemotherapy) was allowed; however, no previous treatment with a BRAF or MEK inhibitor was permitted. Patients were randomly assigned in a 2:1 ratio to receive trametinib (2 mg every day) or IV chemotherapy (either dacarbazine 1,000 mg/m2 every 3 weeks or paclitaxel 175 mg/m2 every 3 weeks). Crossover for patients randomly assigned to chemotherapy was allowed; therefore, the primary end point was PFS.
    • The investigator-assessed PFS was 4.8 months in patients who received trametinib versus 1.5 months in the chemotherapy group (HR for PFS or death, 0.45; 95% CI, 0.33–0.63; P < .001). A radiology review blinded-to-treatment arm resulted in similar outcomes. Median OS has not been reached.
    • AEs leading to dose interruptions occurred in 35% of patients in the trametinib group and 22% of those in the chemotherapy group. AEs leading to dose reductions occurred in 27% of patients who received trametinib and in 10% of those who received chemotherapy.
    • The most common AEs included rash, diarrhea, nausea, vomiting, fatigue, peripheral edema, alopecia, hypertension, and constipation. Cardiomyopathy (7%), interstitial lung disease (2.4%), central serous retinopathy (<1%), and retinal-vein occlusion (<1%) are uncommon but serious AEs associated with trametinib. On-study cutaneous SCCs were not observed. For more information, see Fatigue and Nausea and Vomiting Related to Cancer Treatment.
Cobimetinib

Cobimetinib is a small-molecule, selective MEK inhibitor that the FDA approved in 2015 for use in combination with the BRAF inhibitor vemurafenib. For more information, see the Combination therapy with signal transduction inhibitors section.

KIT inhibitors

Early data suggest that mucosal or acral melanomas with activating mutations or amplifications in c-KIT may be sensitive to a variety of c-KIT inhibitors.[24-26] Phase II and phase III trials are available for patients with unresectable stage III or stage IV melanoma harboring the c-KIT mutation.

Combination therapy with signal transduction inhibitors

Results from phase III trials comparing three different combinations of BRAF-MEK inhibitors with BRAF inhibitor monotherapy have consistently shown efficacy superior to BRAF monotherapy.

Secondary resistance to BRAF inhibitor monotherapy in patients with BRAF V600 mutations may be associated with reactivation of the MAPK pathway. Therefore, combinations of signal transduction inhibitors that block different sites in the same pathway or sites in multiple pathways are an active area of research.

BRAF inhibitor plus MEK inhibitors
Dabrafenib plus trametinib

Evidence (dabrafenib plus trametinib):

  1. Previously untreated. An international, double-blind, phase III trial (COMBI-d [NCT01584648]) without crossover randomly assigned 423 previously untreated patients with unresectable stage IIIC or stage IV melanoma with BRAF V600E or V600K mutations to receive the combination of dabrafenib (150 mg by mouth twice a day) plus trametinib (2 mg by mouth every day) or dabrafenib plus placebo. The primary end point was investigator-assessed PFS. The protocol included a prespecified interim analysis for OS at the time of analysis of the primary end point. Patients were stratified by baseline LDH and BRAF genotype.[27][Level of evidence B1]
    • Median PFS was 9.3 months for the combination versus 8.8 months for dabrafenib plus placebo. The HRdeath or progression was 0.75 (95% CI, 0.57–0.99; P = .03). Updated data at the time of final analysis of OS revealed a median PFS of 11.0 months for the combination versus 8.8 months for dabrafenib plus placebo. The HR for PFS or death was 0.67 (95% CI, 0.53–0.84; P = .0004; unadjusted for multiple testing).[28]
    • A prespecified final analysis of OS was conducted at 70% of events. Median OS was 25.1 months in the dabrafenib-plus-trametinib group (66% events) versus 18.7 months in the dabrafenib-plus-placebo group (76% events). The HR was 0.71 (95% CI, 0.55–0.92; P = 0.01).
    • Permanent discontinuations of study drugs were reported in 9% of patients on the combination and in 5% of patients treated with dabrafenib only.
    • The incidence of grade 3 to grade 4 AEs was similar between the groups: a 35% incidence with the combination and a 37% incidence with dabrafenib only. Pyrexia occurred more frequently with the combination and was treated with immediate temporary cessation of the study drug in either group; prophylactic glucocorticoids may prevent recurring episodes. Hyperproliferative cutaneous events, including cutaneous SCCs, which were considered related to paradoxical activation of the MAPK pathway and occurred less frequently with the addition of the MEK inhibitor. Rare, but serious, AEs included decreased ejection fraction and chorioretinopathy.
  2. Previously untreated. An international, open-label, phase III trial (COMBI-v [NCT01597908]) randomly assigned 704 previously untreated patients with metastatic melanoma with a BRAF V600 mutation to receive standard doses of either the combination of dabrafenib plus trametinib or vemurafenib as first-line therapy. The primary end point was OS.[29][Level of evidence A1]
    • An interim analysis for OS was planned when 202 of the final 288 events occurred. Per protocol, the DMSB used adjusted efficacy boundaries for actual events (222) (2-sided P < .0214 for efficacy and P > .2210 for futility). The DMSB recommended stopping for efficacy, and the interim analysis is considered to be the final analysis of OS. A protocol amendment was issued to allow crossover to the combination therapy arm.
    • A total of 100 patients (28%) in the combination arm and 122 (35%) in the vemurafenib group had died (HR, 0.69; 95% CI, 0.53–0.89; P = .005). Median OS for patients treated with vemurafenib was 17.2 months; the median has not been reached in the combination therapy arm.
  3. Previously untreated. A pooled analysis of the 563 patients who were randomly assigned to receive dabrafenib plus trametinib in the COMBI-d (double-blinded) and COMBI-v (open label) trials (described above) provides estimated 5-year outcomes.[30] After the study, 53% of patients received subsequent treatment; two-thirds of these patients received immunotherapy.
    • Sixty-three percent of patients died (64% in COMBI-d and 61% in COMBI-v) after a median follow-up of 22 months (range, 0−76 months).
    • The estimated 5-year OS rate was 34% (95% CI, 30%−38%) and the investigator-assessed PFS rate was 19% (95% CI, 15%−22%).
    • A CR, which occurred in 109 patients (19%), was associated with an OS rate of 71% (95% CI, 62%−79%) at 5 years.
Vemurafenib plus cobimetinib

Evidence (vemurafenib plus cobimetinib):

  1. Previously untreated. An international phase III trial randomly assigned 495 patients with previously untreated, unresectable stage IIIC or stage IV melanoma with BRAF V600 mutation−positive melanoma to receive the combination of vemurafenib (960 mg by mouth every day) and cobimetinib (60 mg by mouth every day for 21 days followed by a 7-day rest period) or vemurafenib plus placebo. The primary end point was investigator-assessed PFS. Crossover at time of PFS was not allowed. Patients were stratified by stage and geographic region. Two interim analyses of OS were prespecified, with the first specified at the time of analysis of the primary end point.[31][Level of evidence B1]
    • Median PFS was 9.9 months for the combination versus 6.2 months in patients treated with vemurafenib plus placebo. The HRprogression or death was 0.51 (95% CI, 0.39–0.68; P = .001).
    • The first interim analysis of OS is immature because of the few events in both arms; therefore, median survival was not reached in either study group.
    • Rate of withdrawal of therapy caused by AEs was similar between the groups: a 13% rate was found with patients treated with the combination, and a 12% rate was found with patients treated with vemurafenib only. Six deaths were attributed to AEs in the combination group, and three deaths were attributed to AEs in the vemurafenib-only group.
    • The incidence of grade 3 to grade 4 AEs was similar between the groups: a 62% incidence rate was found in patients treated with the combination, and a 58% rate was found in patients treated with vemurafenib alone. Rare, but serious, AEs included chorioretinopathy, retinal detachment, decreased ejection fraction, and QT prolongation. Hyperproliferative cutaneous events, including cutaneous SCC, were considered to be related to paradoxical activation of the MAPK pathway and occurred less frequently with the addition of the MEK inhibitor.
Encorafenib plus binimetinib

Encorafenib is a small-molecule BRAF inhibitor that is approved in combination with binimetinib, a small-molecule MEK inhibitor, for the treatment of unresectable or metastatic melanoma with a BRAF V600E or V600K mutation, as detected by an FDA-approved test. The combination has demonstrated improved PFS and OS compared with vemurafenib; however, neither is approved as single-agent therapy.

Evidence (encorafenib plus binimetinib):

  1. Previously untreated or progression on or after first-line immunotherapy. An international, open-label, phase III trial (COLUMBUS [NCT01909453]) randomly assigned 577 patients with stage IIIB, IIIC, or IV melanoma with BRAF V600 mutation–positive melanoma in a 1:1:1 ratio to receive encorafenib (450 mg every day) plus binimetinib (45 mg twice a day) or encorafenib monotherapy (300 mg every day) or vemurafenib monotherapy (960 mg twice a day).[32,33] The primary end point was PFS for the combination versus vemurafenib as assessed by a blinded IRC with a secondary end point of OS.
    • A minority of patients (approximately 5%) had received previous checkpoint inhibitor therapy.
    • With a median follow-up of 16.6 months, median PFS was 14.9 months (95% CI, 11.0–18.5) with the combination versus 7.3 months (95% CI, 5.6–8.2) with vemurafenib. The HRprogression or death was 0.54 (95% CI, 0.41–0.71; 2-sided P < .0001).
    • With a median follow-up of 36.8 months for the secondary end point of OS, patients in the combination arm had a median OS of 33.6 months (95% CI, 24.4–39.2) versus 16.9 months (95% CI, 14.0–24.5) for patients treated with vemurafenib (HR, 0.61; 95% CI, 0.47–0.79; P < .0001). Subsequent treatments received after discontinuation of the study drug were received by 42% of patients in the combination group and 62% of patients in the vemurafenib group.[32,33][Level of evidence A1]
    • The incidence of grade 3 to 4 AEs was 58% with combination therapy and 63% with vemurafenib. Serious AEs occurred in 34% of the combination group and 37% of the vemurafenib group. The most common AEs in the combination group included gastrointestinal symptoms and elevation of gamma-glutamyl transferase (GGT), elevation of creatine phosphokinase (CPK), left ventricular dysfunction (8%) and serous retinopathy (20%), mostly grade 1 to 2 (monitoring guidelines are provided in the drug label). Patients who received vemurafenib had more pyrexia and cutaneous toxicities. Study drug discontinuations from AEs were 15% in the combination group and 17% with vemurafenib. No deaths were considered to be related to treatment; however, one death from suicide occurred in the combination arm.
Combination signal transduction inhibitor therapy plus PD-L1 inhibitor
Cobimetinib and vemurafenib plus atezolizumab

Evidence (cobimetinib and vemurafenib plus atezolizumab):

  1. A double-blind, placebo-controlled, multicenter trial (IMspire150 [NCT02908672]) randomly assigned (in a 1:1 ratio) 514 patients with BRAF V600 mutation−positive unresectable stage IIIC or metastatic melanoma to receive first-line therapy with cobimetinib plus vemurafenib with either atezolizumab or placebo.[34] Eligibility criteria included ECOG PS scores of 0 to 1, measurable disease, and no previous systemic treatment for metastatic melanoma. Patients with untreated or actively progressing brain metastases or a history of serious autoimmune disease were excluded. Previous adjuvant therapy was allowed (14% of patients).

    After all patients in both arms received a 28-day cycle of cobimetinib and vemurafenib, patients received atezolizumab (840 mg IV every 2 weeks) or placebo in addition to the combination BRAF-MEK inhibitor therapy. The primary efficacy end point was investigator-assessed PFS per RECIST 1.1 criteria.

    • At a median follow-up of 19 months, the primary investigator median PFS was 15 months (95% CI, 11.4−18.4) in the atezolizumab arm and 11 months (95% CI, 9.3−12.7) in the placebo arm (HR, 0.78; 95% CI, 0.63−0.97; P = .0249).
    • An IRC assessment of the triplet therapy found a PFS of 16 months (95% CI, 11.3−18.5) compared with 12 months in the control arm (95% CI, 10.8−14.7) (HR, 0.85; 95% CI, 0.67−1.07).
    • Objective response rates and CRs were similar between the treatment groups.
    • Data are not mature for OS.
    • Serious AEs and treatment discontinuations because of toxicity were similar between the arms. Grade 5 AEs occurred in seven patients in each arm. Two patients with hepatic failure in the atezolizumab group and one patient with pulmonary hemorrhage in the control group were considered treatment related.

The impact of triplet therapy on OS, or when compared with checkpoint inhibitor monotherapy, or to sequential therapy with combination BRAF-MEK inhibitor therapy, preceded or followed by checkpoint inhibition (ongoing trial NCT02224781) is unknown.

Chemotherapy

Dacarbazine was approved in 1970 on the basis of objective response rates. Phase III trials indicate an objective response rate of 10% to 20%, with rare CRs observed. An impact on OS has not been demonstrated in randomized trials.[7,20,35-37] When used as a control arm for recent registration trials of ipilimumab and vemurafenib in previously untreated patients with metastatic melanoma, dacarbazine was inferior for OS.

Temozolomide, an oral alkylating agent that hydrolyzes to the same active moiety as dacarbazine, appeared to be similar to dacarbazine (IV administration) in a randomized, phase III trial with a primary end point of OS. However, the trial was designed for superiority, and the sample size was inadequate to prove equivalency.[36]

The objective response rate to dacarbazine and the nitrosoureas, carmustine and lomustine, is approximately 10% to 20%.[35,38-40] Responses are usually short-lived, ranging from 3 to 6 months, although long-term remissions can occur in a limited number of patients who attain a CR.[38,40]

A randomized trial compared IV dacarbazine with temozolomide, an oral agent; OS was 6.4 months for dacarbazine versus 7.7 months for temozolomide (HR, 1.18; 95% CI, 0.92–1.52). While these data suggested similarity between dacarbazine and temozolomide, no benefit in survival has been demonstrated for either dacarbazine or temozolomide; therefore, demonstration of similarity did not result in FDA approval of temozolomide.[36][Level of evidence A1]

An extended schedule and escalated dose of temozolomide was compared with dacarbazine in a multicenter trial by the European Organisation for Research and Treatment of Cancer (EORTC) (EORTC-18032 [NCT00101218]) randomly assigning 859 patients. No improvement was seen in OS or PFS for the temozolomide group, and this dose and schedule resulted in more toxicity than standard-dose, single-agent dacarbazine.[41][Level of evidence A1]

Two randomized phase III trials in previously untreated patients with metastatic melanoma (resulting in FDA approval for vemurafenib [20] and ipilimumab [7]) included dacarbazine as the standard therapy arm. Both vemurafenib (in BRAF V600 mutant melanoma) and ipilimumab showed superior OS compared with dacarbazine in the two separate trials.

Other agents with modest, single-agent activity include vinca alkaloids, platinum compounds, and taxanes.[38,39]

Attempts to develop combination regimens that incorporate chemotherapy (e.g., multiagent chemotherapy,[42,43] combinations of chemotherapy and tamoxifen,[44-46] and combinations of chemotherapy and immunotherapy [10,11,42,47-50]) have not demonstrated an improvement in OS.

A published data meta-analysis of 18 randomized trials (15 of which had survival information) that compared chemotherapy with biochemotherapy (i.e., the same chemotherapy plus interferon alone or with IL-2) reported no impact on OS.[51][Level of evidence A1]

Palliative local therapy

Melanoma metastatic to distant, lymph node–bearing areas may be palliated by regional lymphadenectomy. Isolated metastases to the lung, gastrointestinal tract, bone, or sometimes the brain may be palliated by resection, with occasional long-term survival.[48-50]

Although melanoma is a relatively radiation-resistant tumor, palliative radiation therapy may alleviate symptoms. Retrospective studies have shown that symptom relief and some shrinkage of the tumor with radiation therapy may occur in patients with the following:[52,53]

  • Multiple brain metastases.
  • Bone metastases.
  • Spinal cord compression.

The most effective dose-fractionation schedule for palliation of melanoma metastatic to the bone or spinal cord is unclear, but high-dose-per-fraction schedules are sometimes used to overcome tumor resistance. For more information, see Cancer Pain.

Treatment Options Under Clinical Evaluation for Unresectable Stage III, Stage IV, and Recurrent Melanoma

  1. Immunotherapy—single agent and combination immunomodulation.
  2. Targeted therapy—single-agent and combination therapy.
    1. Signal transduction inhibitors, including PI3K (phosphoinositide-3 kinase) and Akt (protein kinase B) inhibitors, CDK (cyclin-dependent kinase) in addition to BRAF and MEK inhibitors.
    2. Antiangiogenesis agents. Preclinical data suggest that increased vascular endothelial growth factor production may be implicated in resistance to BRAF inhibitors.[54]
    3. Targeted therapy for specific melanoma populations.
      • In smaller subsets of melanoma, activating mutations may occur in NRAS (15%–20%), c-KIT (28%–39% of melanomas arising in chronically sun-damaged skin, or acral and mucosal melanomas), and CDK4 (<5%), whereas GNAQ is frequently mutated in uveal melanomas. Drugs developed to target the pathways activated by these mutations are currently in clinical trials.
  3. Combinations of immunotherapy and targeted therapy.
  4. Intralesional injections (for example, oncolytic viruses).
  5. Complete surgical resection of all known disease versus best medical therapy.
  6. Isolated limb perfusion for unresectable extremity melanoma.
  7. Systemic therapy for unresectable disease.

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

References
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  29. Robert C, Karaszewska B, Schachter J, et al.: Improved overall survival in melanoma with combined dabrafenib and trametinib. N Engl J Med 372 (1): 30-9, 2015. [PUBMED Abstract]
  30. Robert C, Grob JJ, Stroyakovskiy D, et al.: Five-Year Outcomes with Dabrafenib plus Trametinib in Metastatic Melanoma. N Engl J Med 381 (7): 626-636, 2019. [PUBMED Abstract]
  31. Larkin J, Ascierto PA, Dréno B, et al.: Combined vemurafenib and cobimetinib in BRAF-mutated melanoma. N Engl J Med 371 (20): 1867-76, 2014. [PUBMED Abstract]
  32. Dummer R, Ascierto PA, Gogas HJ, et al.: Encorafenib plus binimetinib versus vemurafenib or encorafenib in patients with BRAF-mutant melanoma (COLUMBUS): a multicentre, open-label, randomised phase 3 trial. Lancet Oncol 19 (5): 603-615, 2018. [PUBMED Abstract]
  33. Dummer R, Ascierto PA, Gogas HJ, et al.: Overall survival in patients with BRAF-mutant melanoma receiving encorafenib plus binimetinib versus vemurafenib or encorafenib (COLUMBUS): a multicentre, open-label, randomised, phase 3 trial. Lancet Oncol 19 (10): 1315-1327, 2018. [PUBMED Abstract]
  34. Gutzmer R, Stroyakovskiy D, Gogas H, et al.: Atezolizumab, vemurafenib, and cobimetinib as first-line treatment for unresectable advanced BRAFV600 mutation-positive melanoma (IMspire150): primary analysis of the randomised, double-blind, placebo-controlled, phase 3 trial. Lancet 395 (10240): 1835-1844, 2020. [PUBMED Abstract]
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Latest Updates to This Summary (04/16/2024)

The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.

General Information About Melanoma

Updated statistics with estimated new cases and deaths for 2024 (cited American Cancer Society as reference 1).

Revised text to state that since the early 2000s, the incidence of melanoma in people aged 50 years and older has stabilized in men and increased by about 3% per year in women.

This summary is written and maintained by the PDQ Adult Treatment Editorial Board, which is editorially independent of NCI. The summary reflects an independent review of the literature and does not represent a policy statement of NCI or NIH. More information about summary policies and the role of the PDQ Editorial Boards in maintaining the PDQ summaries can be found on the About This PDQ Summary and PDQ® Cancer Information for Health Professionals pages.

About This PDQ Summary

Purpose of This Summary

This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about the treatment of melanoma. It is intended as a resource to inform and assist clinicians in the care of their patients. It does not provide formal guidelines or recommendations for making health care decisions.

Reviewers and Updates

This summary is reviewed regularly and updated as necessary by the PDQ Adult Treatment Editorial Board, which is editorially independent of the National Cancer Institute (NCI). The summary reflects an independent review of the literature and does not represent a policy statement of NCI or the National Institutes of Health (NIH).

Board members review recently published articles each month to determine whether an article should:

  • be discussed at a meeting,
  • be cited with text, or
  • replace or update an existing article that is already cited.

Changes to the summaries are made through a consensus process in which Board members evaluate the strength of the evidence in the published articles and determine how the article should be included in the summary.

The lead reviewers for Melanoma Treatment are:

  • Russell S. Berman, MD (New York University School of Medicine)
  • Shaheer A. Khan, PhD (Columbia University Irving Medical Center)

Any comments or questions about the summary content should be submitted to Cancer.gov through the NCI website's Email Us. Do not contact the individual Board Members with questions or comments about the summaries. Board members will not respond to individual inquiries.

Levels of Evidence

Some of the reference citations in this summary are accompanied by a level-of-evidence designation. These designations are intended to help readers assess the strength of the evidence supporting the use of specific interventions or approaches. The PDQ Adult Treatment Editorial Board uses a formal evidence ranking system in developing its level-of-evidence designations.

Permission to Use This Summary

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The preferred citation for this PDQ summary is:

PDQ® Adult Treatment Editorial Board. PDQ Melanoma Treatment. Bethesda, MD: National Cancer Institute. Updated <MM/DD/YYYY>. Available at: https://www.cancer.gov/types/skin/hp/melanoma-treatment-pdq. Accessed <MM/DD/YYYY>. [PMID: 26389469]

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Based on the strength of the available evidence, treatment options may be described as either “standard” or “under clinical evaluation.” These classifications should not be used as a basis for insurance reimbursement determinations. More information on insurance coverage is available on Cancer.gov on the Managing Cancer Care page.

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