GSTP1 and hepatocellular carcinoma: In the present study, the age-related effect of GSTP1 AG and GG alleles on HCC susceptibility in the younger group, aged ≤ 57 years, but not in the older group, aged > 57 years, may have resulted from: 1) The younger group, aged ≤ 57 years, was more likely exposed to HCC-related risk factors [26,29-31].