As shown in Table S1, PD-L1 expression of CPS≥5 was significantly related to age (CPS≥5 vs. CPS<5: 59.0 ± 12.0 vs. 56.1 ± 12.7, p<0.001), tumor size≥5 cm (CPS≥5 vs. CPS<5: 33.0% vs. 26.9%, p=0.043), Lauren classification (CPS≥5 vs. CPS<5: intestinal/diffuse/mix: 25.4%/57.8%/16.8% vs. 31.5%/57.3%/11.2%, p=0.033), CD-31 positivity (CPS≥5 vs. CPS<5: 27.5% vs. 17.5%, p=0.001), D240 positivity (CPS≥5 vs. CPS<5: 34.0% vs. 26.9%, p=0.034), EBV positivity (CPS≥5 vs. CPS<5: 7.3% vs. 1.6%, p<0.001), and the Ki-67 index (CPS≥5 vs. CPS<5: 61.3% ± 23.3% vs. 53.6% ± 24.3%, p<0.001). Here, PECAM1 is linked to neoplasm.