In addition, the expression of Cyp2j8 (homologous gene of human CYP2J2) was significantly up-regulated, whereas the expression of Cyp2j9, Cyp2c39, and Cyp2c40 was significantly down-regulated in the tumor tissues of MMTV-PyMT mice (Fig. 1L and Supplementary Fig. S1G). Here, CYP2J2 is linked to neoplasm.