title: Cellular estrogen and progesterone receptors in mammary carcinoma.
abstract: Cellular estrogen and progesterone receptors of human mammary cancer in cryostat-frozen sections were studied simultaneously. The receptor tracers used were a mixture of 17 beta-estradiol-6-carboxymethyl oxime-bovine serum albumin-fluorescein isothiocyanate and 11 alpha-hydroxyprogesterone hemisuccinate-bovine serum albumin-tetramethylrhodamine isothiocyanate conjugate. After incubation with the tracers, the estrogen-binding sites manifested apple-green, and the progesterone-binding sites manifested orange-red fluorescence when examined with a fluorescence microscope equipped with appropriate filters. The findings indicate that most estrogen-receptor-positive epithelial cells, benign or malignant, of the mammary glands contain a significant number of progesterone-receptor sites. Incorporation of a fluorescent progesterone conjugate into the histochemical reagent may help to confirm the existence of an operative receptor system in the cancer cells.
mesh_terms: D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000378:metabolism*; D005260:Female; D005629:Frozen Sections; D006651:Histocytochemistry; D006801:Humans; D008875:Middle Aged; D011960:Receptors, Estrogen / Q000378:metabolism*; D011980:Receptors, Progesterone / Q000378:metabolism*
chemical_list: D011960:Receptors, Estrogen; D011980:Receptors, Progesterone