title: Estradiol 17 beta-dehydrogenase and estradiol binding in human mammary tumors.
abstract: The metabolism of estradiol was studied in 31 human breast carcinoma in vitro. All 16 estrogen-receptor-poor tumors transformed estradiol to estrone with percent conversions ranging from 11.4 to 95 except for one poorly differentiated tumor where 0.5% conversion to estrone was observed. On the contrary, only 3 out of 15 estrogen-receptor-rich tumors showed higher than 10% conversion of estradiol to estrone (p = 0.001). There is indication that the enzymatic activity in receptor-poor tumors steadily decreases in premenopausal patients as they approach menopausal age, whereas, the activity steadily increases in post-menopausal patients as the duration of menopause lengthens.
mesh_terms: D015067:17-Hydroxysteroid Dehydrogenases / Q000378:metabolism*; D000328:Adult; D000367:Age Factors; D000368:Aged; D001943:Breast Neoplasms / Q000378:metabolism*; D003600:Cytosol / Q000378:metabolism; D004958:Estradiol / Q000378:metabolism*; D004960:Estradiol Dehydrogenases / Q000378:metabolism*; D005260:Female; D006801:Humans; D008593:Menopause; D008875:Middle Aged; D011960:Receptors, Estrogen / Q000378:metabolism*
chemical_list: D011960:Receptors, Estrogen; D004958:Estradiol; D015067:17-Hydroxysteroid Dehydrogenases; D004960:Estradiol Dehydrogenases