title: Adriamycin action on human breast cancer cells: enhancement by medroxyprogesterone acetate.
abstract: Exposure of cultured human breast cancer cells (MCF-7) to medroxyprogesterone acetate (MPA) prior to treatment with adriamycin (ADR) enhanced the effect of the cytotoxic drug on cell yield after further growth of viable cells. Pretreatment with oestradiol (E2) produced similar synergism, but no such effect was observed using dexamethasone. Exposure to ADR before MPA led to an additive effect, but not to synergism. When cells resistant to the growth-inhibitory action of MPA were examined, progestogen/drug synergism could still be demonstrated. We conclude that the effects of ADR, like those of methotrexate and vincristine, can be enhanced by pre-treatment with MPA and that further clinical trials of such a regimen are needed.
authors.affiliation: Breast Clinic, St. Mary's Hospital and Medical School, London, UK.
authors.forename: N A
authors.initials: NA
authors.lastname: Shaikh
authors.forename: A M
authors.initials: AM
authors.lastname: Owen
authors.forename: M W
authors.initials: MW
authors.lastname: Ghilchik
authors.forename: H
authors.initials: H
authors.lastname: Braunsberg
mesh_terms: D000970:Antineoplastic Agents / Q000008:administration & dosage; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D001943:Breast Neoplasms / Q000188:drug therapy*; D002460:Cell Line; D003907:Dexamethasone / Q000008:administration & dosage; D004305:Dose-Response Relationship, Drug; D004317:Doxorubicin / Q000008:administration & dosage; D004353:Drug Evaluation, Preclinical; D004357:Drug Synergism; D004958:Estradiol / Q000008:administration & dosage; D005260:Female; D006801:Humans; D008525:Medroxyprogesterone / Q000008:administration & dosage / Q000031:analogs & derivatives; D017258:Medroxyprogesterone Acetate; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D004958:Estradiol; D003907:Dexamethasone; D004317:Doxorubicin; D017258:Medroxyprogesterone Acetate; D008525:Medroxyprogesterone