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. 2020 Nov 23;8(1):201.
doi: 10.1186/s40478-020-01078-2.

TERT promoter mutation confers favorable prognosis regardless of 1p/19q status in adult diffuse gliomas with IDH1/2 mutations

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TERT promoter mutation confers favorable prognosis regardless of 1p/19q status in adult diffuse gliomas with IDH1/2 mutations

Hideyuki Arita et al. Acta Neuropathol Commun. .

Abstract

TERT promoter mutations are commonly associated with 1p/19q codeletion in IDH-mutated gliomas. However, whether these mutations have an impact on patient survival independent of 1p/19q codeletion is unknown. In this study, we investigated the impact of TERT promoter mutations on survival in IDH-mutated glioma cases. Detailed clinical information and molecular status data were collected for a cohort of 560 adult patients with IDH-mutated gliomas. Among these patients, 279 had both TERT promoter mutation and 1p/19q codeletion, while 30 had either TERT promoter mutation (n = 24) or 1p/19q codeletion (n = 6) alone. A univariable Cox proportional hazard analysis for survival using clinical and genetic factors indicated that a Karnofsky performance status score (KPS) of 90 or 100, WHO grade II or III, TERT promoter mutation, 1p/19q codeletion, radiation therapy, and extent of resection (90-100%) were associated with favorable prognosis (p < 0.05). A multivariable Cox regression model revealed that TERT promoter mutation had a significantly favorable prognostic impact (hazard ratio = 0.421, p = 0.049), while 1p/19q codeletion did not have a significant impact (hazard ratio = 0.648, p = 0.349). Analyses incorporating patient clinical and genetic information were further conducted to identify subgroups showing the favorable prognostic impact of TERT promoter mutation. Among the grade II-III glioma patients with a KPS score of 90 or 100, those with IDH-TERT co-mutation and intact 1p/19q (n = 17) showed significantly longer survival than those with IDH mutation, wild-type TERT, and intact 1p/19q (n = 185) (5-year overall survival, 94% and 77%, respectively; p = 0.032). Our results demonstrate that TERT promoter mutation predicts favorable prognosis independent of 1p/19q codeletion in IDH-mutated gliomas. Combined with its adverse effect on survival among IDH-wild glioma cases, the bivalent prognostic impact of TERT promoter mutation may help further refine the molecular diagnosis and prognostication of diffuse gliomas.

Keywords: 1p/19q codeletion; CDKN2A; Glioma; IDH1/2; TERT.

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Conflict of interest statement

The authors declare no conflicts of interest in association with this paper.

Figures

Fig. 1
Fig. 1
Kaplan-Meier analysis for OS in IDH-mutated gliomas when stratified by TERT and 1p/19q status (n = 560). TERT-mutated-1p/19q intact group showed an intermediate survival curve between TERT-mutated-1p/19q codeleted and TERT-wildtype-1p/19q intact groups, although the differences were not statistically significant. codel, codeleted; OS, overall survival; and 5yOS, 5-year overall survival
Fig. 2
Fig. 2
Survival impact of TERT and 1p/19q statuses in grade II–III gliomas when stratified by Karnofsky Performance Status (KPS) scores. a OS of WHO grade II–III cases (n = 527) stratified by the TERT and 1p/19q statuses. Survival curves of TERT-mutated-1p/19q intact group and TERT-mutated-1p/19q codeleted group were mostly overlapping. b OS of WHO grade IV cases (n = 33) stratified by the TERT and 1p/19q statuses. TERT-mutated-1p/19q intact group showed a tendency towards longer survival compared with that of the TERT-wildtype-1p/19q intact group although the difference was not significant. c TERT-mutated-1p/19q intact cases with a high KPS score (90 or 100) had a favorable prognosis comparable to that of the TERT-mutated-1p/19q codeleted cases. D. When analyzed in the population with a KPS score below 90, TERT mutation without 1p/19q codeletion did not show survival benefit. codel, codeleted; KPS, Karnofsky Performance Status; OS, overall survival.; 5yOS, 5-year overall survival

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