CYP26A1 and hepatocellular carcinoma: Our analysis revealed that CYP1B1, CYP7A1, CYP17A1, and CYP19A1 were significantly overexpressed in HCC, while CYP1A2, CYP2B6, CYP2C19, and CYP26A1 were significantly repressed in HCC, compared to their expression in normal liver tissues (Figure 2C).