Immune checkpoints release suppressive signals for T cells,which enable the tumors to escape from immune destruction and provide a new concept that uses the capabilities of the immune system as a therapeutic target for tumors.At present,programmed death receptor 1(PD-1)/programmed death ligand-1(PDL1) has become the most promising therapeutic target.PD-1/PD-L1 blockades exhibit long-lasting antitumor efficacy and safety in patients with various cancers,such as melanoma and non-small-cell lung cancer.Moreover,PD-L1 is highly expressed in the peripheral blood and tumor specimens of patients with cancer,and the expression of PD-L1 is positively correlated with various pathological features and may serve as a predictor of poor prognosis or a diagnostic tool.Clinical trials have verified that PD-1/PD-L1 blockade therapy benefits patients with advanced gastric cancer or gastroesophageal junction cancer.Furthermore,there are many molecules involved in the regulation of PD-1/PD-L1 expression,and the modification of these molecules via drugs and combinations with PD-1/PD-L1 inhibitors may further improve the efficacy of immunotherapy for gastric cancer.In this review,the efficacy,safety,and possible combination treatment options of PD-1/PD-L1 in gastric cancer are reviewed in experimental and clinical settings.
展开▼
