PDCD1 and hepatocellular carcinoma: The analysis within HBV patient subgroups showed that the haplotype CT (PD-1.5 C and PD-1.9 T) was frequently observed in patients with advanced liver disease rather than those with CHB [LC vs. CHB: OR = 1.6(1.1–2.4), padj = 0.009; HCC vs. CHB: OR = 1.5 (1.1–2.2), padj = 0.016; LC + HCC vs. CHB: OR = 1.6(1.2–2.2), padj = 0.0028].