Aberrant PD-L1 expression through 3'-UTR disruption in multiple cancers
- PMID: 27281199
- DOI: 10.1038/nature18294
Aberrant PD-L1 expression through 3'-UTR disruption in multiple cancers
Abstract
Successful treatment of many patients with advanced cancer using antibodies against programmed cell death 1 (PD-1; also known as PDCD1) and its ligand (PD-L1; also known as CD274) has highlighted the critical importance of PD-1/PD-L1-mediated immune escape in cancer development. However, the genetic basis for the immune escape has not been fully elucidated, with the exception of elevated PD-L1 expression by gene amplification and utilization of an ectopic promoter by translocation, as reported in Hodgkin and other B-cell lymphomas, as well as stomach adenocarcinoma. Here we show a unique genetic mechanism of immune escape caused by structural variations (SVs) commonly disrupting the 3' region of the PD-L1 gene. Widely affecting multiple common human cancer types, including adult T-cell leukaemia/lymphoma (27%), diffuse large B-cell lymphoma (8%), and stomach adenocarcinoma (2%), these SVs invariably lead to a marked elevation of aberrant PD-L1 transcripts that are stabilized by truncation of the 3'-untranslated region (UTR). Disruption of the Pd-l1 3'-UTR in mice enables immune evasion of EG7-OVA tumour cells with elevated Pd-l1 expression in vivo, which is effectively inhibited by Pd-1/Pd-l1 blockade, supporting the role of relevant SVs in clonal selection through immune evasion. Our findings not only unmask a novel regulatory mechanism of PD-L1 expression, but also suggest that PD-L1 3'-UTR disruption could serve as a genetic marker to identify cancers that actively evade anti-tumour immunity through PD-L1 overexpression.
Comment in
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Cancer genetics: Evading antitumour immunity.Nat Rev Genet. 2016 Jul;17(7):374. doi: 10.1038/nrg.2016.77. Epub 2016 Jun 6. Nat Rev Genet. 2016. PMID: 27265363 No abstract available.
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Immunotherapy: Study deciphers enigmatic mechanism of PD-L1 overexpression.Nat Rev Clin Oncol. 2016 Jul;13(7):395. doi: 10.1038/nrclinonc.2016.97. Epub 2016 Jun 7. Nat Rev Clin Oncol. 2016. PMID: 27273043 No abstract available.
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