Expression of Cytochrome P450 enzymes 3 family genes. Right, PXR and CYP3A4, left, CYP3A5 and CYP3A7. The data are mean ± SE, Significantly different from normal livers, aP < 0.05 vs normal liver; HCC different from peri-HCC tissues. PXR: Pregnane X receptor; CYP: Cytochrome P450 enzymes; HCC: Hepatocellular carcinoma.