CD274 and gastric cancer: For MSS gastric cancers, the OS and DFS were significantly worse in patients with PD-L1-positive tumors compared to those with PD-L1-negative tumors (P = 0.007 and P = 0.018, respectively; 101.1 ± 5.2 months vs. 114.7 ± 3.4 months for OS; 99.8± 5.4 months vs. 111.7 ± 3.6 months for DFS).