CYP2R1 and hepatocellular carcinoma: Hence, we genotyped the most relevant tagging SNPs for these loci (rs1993116/rs10741657 for CYP2R1, rs2282679 for GC, rs7944926/rs12785878 for DHCR7; data on LD and Hardy Weinberg equilibrium for these SNPs are shown in Table S1), and assessed their association with HCV-related HCC.