• Julien Taieb, Markus Moehler, Narikazu Boku, Jaffer A Ajani, Eduardo Yañez Ruiz, Min-Hee Ryu, Silke Guenther, Vikram Chand, and Yung-Jue Bang.
• Sorbonne Paris Cité, Paris Decartes University, Hôpital Européen Georges-Pompidou, Paris, France. Electronic address: jtaieb75@gmail.com.
• Cancer Treat. Rev. 2018 May 1; 66: 104-113.

BackgroundStandard treatment options for patients with advanced gastric or gastroesophageal junction cancer (GC/GEJC) are associated with limited efficacy and some toxicity. Recently, immunotherapy with antibodies that inhibit the programmed death 1 (PD-1)/programmed death ligand 1 (PD-L1) interaction has emerged as a new treatment option. This manuscript reviews early-phase and late-phase trials of immunotherapy in advanced GC/GEJC.MethodsSearches for studies of immunotherapy in GC/GEJC were performed using PubMed, ClinicalTrials.gov, and abstract databases for select annual congresses. Findings were interpreted based on expert opinion.ResultsMonotherapy with anti-PD-1/PD-L1 antibodies, including pembrolizumab, nivolumab, avelumab, durvalumab, and atezolizumab, has shown interesting objective response rates (ORRs; 7-26%) across varying GC/GEJC populations, with ORRs potentially higher in PD-L1 + vs PD-L1 - tumors. Safety profiles compare favorably with chemotherapy, with grade ≥3 treatment-related adverse events occurring in 5-17%. Based on a large phase 2 study, pembrolizumab was approved in the United States for third-line treatment of patients with PD-L1 + GC/GEJC. In a phase 3 trial, third-line or later nivolumab increased overall survival vs placebo in an Asian population, leading to regulatory approval in Japan, although other completed phase 3 trials did not show superiority for pembrolizumab or avelumab monotherapy vs chemotherapy. Other trials in advanced GC/GEJC are assessing various anti-PD-1/PD-L1-based strategies, including administration in first-line and later-line settings and as combination (with chemotherapy or agents targeting other immune checkpoint proteins, eg, CTLA-4, LAG-3, and IDO) or switch-maintenance regimens.ConclusionsAnti-PD-1/PD-L1 antibodies have shown encouraging clinical activity in advanced GC/GEJC. Results from ongoing phase 3 trials are needed to further evaluate the potential roles of these agents within the continuum of care.Copyright © 2018 The Authors. Published by Elsevier Ltd.. All rights reserved.

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