Mitomycin as a modulator of irinotecan anticancer activity.
Irinotecan and mitomycin (Mutamycin) possess significant single-agent activity against several tumor types, and mitomycin activates topoisomerase I, the cellular target of irinotecan. We conducted a phase I dose-escalation study of irinotecan and mitomycin in 37 evaluable patients with solid tumors. Antitumor responses included 2 complete responses, 5 partial responses, 10 minor responses, and a CA 19-9 tumor marker response. Responders included 14 patients previously treated with chemotherapy for metastatic disease. No pharmacokinetic interaction between mitomycin and irinotecan was apparent when these agents were given 24 hours apart. Responders (complete and partial responses) demonstrated the largest topoisomerase I induction 24 hours following mitomycin infusion. In addition, since maximum topoisomerase I up-regulation was reached 24 hours after administration of mitomycin, a delay in the administration of irinotecan after mitomycin appeared justified. Based on these encouraging phase I data, phase II clinical trials in breast and esophageal/gastroesophageal junction adenocarcinomas at the recommended doses and schedule are under way.
Villalona-Calero
Miguel A
MA
Department of Medicine and Comprehensive Cancer Center, The Ohio State University, Columbus, USA. villalona-1@medctr.osu.edu
Kolesar
Jill M
JM
D000971:Antineoplastic Combined Chemotherapy Protocols / Q000008:administration & dosage* / Q000009:adverse effects; D001707:Biopsy, Needle; D002166:Camptothecin / Q000008:administration & dosage* / Q000009:adverse effects / Q000031:analogs & derivatives*; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D004357:Drug Synergism; D005260:Female; D006801:Humans; D000077146:Irinotecan; D008297:Male; D020714:Maximum Tolerated Dose; D016685:Mitomycin / Q000008:administration & dosage* / Q000009:adverse effects; D009367:Neoplasm Staging; D009369:Neoplasms / Q000188:drug therapy* / Q000401:mortality / Q000473:pathology*; D018579:Patient Selection; D011379:Prognosis; D016019:Survival Analysis; D016896:Treatment Outcome
D016685:Mitomycin; D000077146:Irinotecan; D002166:Camptothecin