In addition, the expression level of PD-L1 was another predictive biomarker of ICIs therapy for several solid tumors, including non-small cell lung cancer [34], gastroesophageal cancer [35], etc. Therefore, here we analyzed microsatellite state, level of TMB, and PD-L1 expression in Chinese patients with SBC, and compared differences in these biomarkers between duodenum cancer and jejunum/ileum cancer. This evidence concerns the gene CD274 and duodenum cancer.