The pooled HR of OS (HR = 0.71; 95% CI: 0.60–0.85) and PFS (HR = 0.64; 95% CI: 0.53–0.77) demonstrated significantly better benefit in PD-1/PD-L1 inhibitors combination group than targeted monotherapy to treat unresectable HCC. Here, PDCD1 is linked to hepatocellular carcinoma.