SULT1E1 and ovarian carcinoma: Steroid sulfatase (STS), estrogen sulfotransferase (EST), and 17b-hydroxysteroid dehydrogenases 2 (17BHSD2) and 5 (17BHSD5) have been detected in ovarian cancer cell lines, with a higher formation of estradiol in comparison to normal ovarian epithelium cells [133].