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Primary hepatocellular carcinoma (HCC) is one of the most common cancers occurring in human,and there is strong epidemiological evidence suggesting that persistent hepatitis B virus (HBV) infection is the most important risk factor for its development.HBx gene was found to be a transactivator recently.Its continuous expression in hepatocytes may transactivate cellular genes which can play a certain role in development of HCC.The HBx gene fragment was used to construct a recombinant eukaryotic expression vector pCEP4 and introduced into HepG2 cells.The effect of HBx gene on HCC cells growth and its molecular mechanism in HCC cells regulation were investigated.