ERBB2 and hepatocellular carcinoma: To further explore the function of HER2, both HER2‐transfection in HER2‐negative expressed McA cells and monoclonal antibody targeting HER2, Trastuzumab, were applied in HCC cells, including HepG2, JM1, and HER2‐transfected McA cells, to test the effect of HER2 on biological characteristics.