These qPCR results confirmed a similar distribution of gene expression; overexpression of CYP1B1, CYP7A1, CYP17A1, and CYP19A1, and repression of CYP1A2, CYP2B6, CYP2C19, and CYP26A1 was observed in cancer tissues (Figure 4). The gene discussed is CYP26A1; the disease is cancer.