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Johnson, David; Ma, Brigette B.Y.
Oral oncology, February 2021, 2021-02-00, 20210201, Volume: 113Journal Article
•Targeting the PD-1/ PD-L1 axis is an area of active research in nasopharyngeal carcinoma.•The role of predictive biomarkers for checkpoint inhibition remains to be defined.•Combinational treatments are being actively evaluated in clinical trials. Upregulation of the programmed cell death receptor-1 and ligand (PD-1/PD-L1) pathway is one of many possible mechanisms of immune-evasion relevant to Epstein-Barr virus (EBV)- associated nasopharyngeal cancer (NPC). The therapeutic targeting of the PD-1/ PD-L1 axis is an area of active research in NPC and at least 8 monoclonal or bi-specific antibodies targeting this axis are currently under clinical evaluation in some of the following clinical settings: (1) palliative treatment of recurrent and/or metastatic (R/M) disease; (2) radical treatment of locoregionally advanced disease in adjunct to conventional chemoradiotherapy; (3) local/ regional recurrence. PD-1 antibodies as monotherapy has been reported to yield an overall objective response in around 20–30% of patients with R/M NPC in single-armed phase II trials, and the predictive role of PD-L1 expression in NPC remains to be defined. As with other solid tumors, combinatorial strategies with cytotoxic chemotherapy, radiotherapy or other immunotherapeutic agents (such as other immune-checkpoint inhibitors, EBV-targeting cellular therapy and other immune-modulating agents) and vascular endothelial growth factor/receptor antibodies are actively being evaluated in clinical trials with single-armed or randomized designs. This article will review the scientific rationale of targeting the PD1/PD-L1 axis in NPC, and summarizes the latest trials involving these agents and predictive biomarkers of response to PD-1/PD-L1 antibodies in NPC.
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