Immunohistochemical staining with an anti-SFXN4 antibody demonstrated a striking and statistically significant increase in SFXN4 staining in both HGSOC and endometrioid tumor tissue when compared to normal ovarian surface epithelium and fimbriae of the fallopian tube, tissues of origin of these cancers14 (Fig. 1A). Here, SFXN4 is linked to endometrioid tumor.