title: [Mechanism of action of progestins in the treatment of hormone-dependent breast cancer (author's transl)].
abstract: The in vitro interference of some gestagens with the binding of 3H-17-beta-oestradiol to cytosol specific receptors was investigated with a view to elucidating the mechanism of action of progestins in the treatment of human hormone-dependent breast cancer. A decrease (up to 85%) of oestradiol binding capacity was observed with high concentrations of progesterone, clogestone and medrogestone. These findings are in good agreement with those previously obtained by the same progestins in our laboratory on rat uterine estrogen receptors in vitro or in vivo. These results provide the support for the hypothesis that the mode of action of  progestins in the therapy of mammary and perhaps uterine carcinomas is to some extent related to the inhibition of oestradiol binding to cytosol specific receptors.
mesh_terms: D001943:Breast Neoplasms / Q000188:drug therapy*; D006801:Humans; D066298:In Vitro Techniques; D008524:Medrogestone / Q000627:therapeutic use; D011244:Pregnadienediols / Q000627:therapeutic use; D011374:Progesterone / Q000627:therapeutic use; D011372:Progestins / Q000627:therapeutic use*
chemical_list: D011244:Pregnadienediols; D011372:Progestins; D008524:Medrogestone; D011374:Progesterone
vernacular_title: Sul meccanismo d'azione dei progestinici nella terapia dei tumori mammari ormono - dipendenti