Hepatocellular carcinoma (HCC), of which the morbidity and mortality are in the forefront among the overall tumors worldwide, is one of the malignancies with difficult in early diagnosis and extremely poor prognosis. Hepatitis B virus (HBV) infection and aflatoxin B_1 (AFB_1) exposure are recognized as the main factors for HCC. The formation of HCC is a multistep, multistage and multifactor process like most other tumors. The conventional strategy of research on single gene has been challenged by the rapidl...