Collectively, these data demonstrated that pattern 1 with membrane expression of CMTM6+PD-L1+ and/or CMTM4+PD-L1+ on the surface of tumor epithelium is associated with better response to anti-PD-1/L1 therapy. The membrane co-expression of CMTM6/4 with PD-L1 on the tumor epithelial cells may thus be a promising criterium for precision therapeutic patient stratification....In summary, the co-expression of CMTM6/4 with PD-L1 on the membrane of gastric cancer cells predicts poor prognosis as well as better short-term efficacy of immunotherapy with anti-PD-1/L1 antibodies.