title: Therapy for mouse tumors and human tumor xenografts with the antitumor antibiotic AT-125.
abstract: The antimetabolite antibiotic L-(alphaS,5S)-alpha-amino-3-chloro-4,5-dihydro-5-isoxazoleacetic acid (AT-125) showed significant antitumor activity against L1210 and P388 mouse leukemias and the M5076 mouse ovarian tumor. Depending on the schedule of administration, increases in lifespan of greater than 100% were observed. Activity was observed after ip, oral, or sc inoculation of AT-125 in mice inoculated with L1210 by the ip route. Lewis lung carcinoma and B16 melanoma were not affected by AT-125. The compound was used to treat human tumor xenografts in athymic (nude) mice. The MX-1 mammary tumor regressed when treated with either 8 or 16 mg/kg/day for 10 days, while a dose of 32 mg/kg was toxic. On an every-4-days x 3 schedule there was a marked slowing of MX-1 tumor growth at 50, 100, and 200 mg/kg. The LX-1 lung tumor xenograft growth was slowed significantly by a dose of 32 mg/kg. Growth of colon tumors, CX-1, CX-2, and CX-3, was not affected by AT-125.
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000627:therapeutic use*; D004195:Disease Models, Animal; D004353:Drug Evaluation, Preclinical; D005260:Female; D005998:Glycine / Q000031:analogs & derivatives* / Q000627:therapeutic use; D006801:Humans; D007555:Isoxazoles / Q000627:therapeutic use*; D051379:Mice; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000188:drug therapy*; D010080:Oxazoles / Q000627:therapeutic use*; D014183:Transplantation, Heterologous
chemical_list: D000903:Antibiotics, Antineoplastic; D007555:Isoxazoles; D010080:Oxazoles; D005998:Glycine