Importantly, we also identified 8 proteins that significantly differentiate HCC patients with ‘normal’ levels of AFP (< 20 ng/ml) from hepatitis patients (p < 0.05) (IL1RN, IFNG, CDKN1A, RETN, CXCL14, CTNNB, FGF2, and SELL). This evidence concerns the gene AFP and hepatitis A virus infection.