title: The inhibitory effect of 5-acetoxy-2-(4-acetoxyphenyl)-1-ethyl-3-methylindole (D 16726) on estrogen-dependent mammary tumors.
abstract: The antineoplastic activity of the antiestrogen 5-acetoxy-2-(4-acetoxyphenyl)-1-ethyl-3-methylindole (D 16726) was determined in several estrogen-dependent mammary tumor models. The growth of the DMBA-induced rat mammary carcinoma was inhibited by doses ranging from 1 to 12 mg/kg. The maximum decrease of tumor area was 67% (control + 635%). D 16726 was also active against MNU-induced rat mammary tumors and transplanted MXT tumors of the mouse. The growth of estrogen receptor-positive MCF-7 breast cancer cells was inhibited by the hydroxy derivative D 15414 (10(-8)-10(-5) M). Because of the high binding affinity of D 15414 for the estrogen receptor (RBA 6.7-10.0) and the lack of activity against hormone-independent MDA-MB 231 breast cancer cells, a specific mode of action involving the estrogen receptor is likely.
mesh_terms: D015127:9,10-Dimethyl-1,2-benzanthracene; D000818:Animals; D001943:Breast Neoplasms / Q000473:pathology; D005260:Female; D006801:Humans; D007211:Indoles / Q000627:therapeutic use*; D008325:Mammary Neoplasms, Experimental / Q000139:chemically induced / Q000188:drug therapy*; D008770:Methylnitrosourea; D051379:Mice; D008815:Mice, Inbred Strains; D009368:Neoplasm Transplantation; D009376:Neoplasms, Hormone-Dependent / Q000188:drug therapy*; D051381:Rats; D011919:Rats, Inbred Strains; D011960:Receptors, Estrogen / Q000378:metabolism; D013629:Tamoxifen / Q000627:therapeutic use
chemical_list: D007211:Indoles; D011960:Receptors, Estrogen; D013629:Tamoxifen; C041791:zindoxifene; D015127:9,10-Dimethyl-1,2-benzanthracene; D008770:Methylnitrosourea