title: [A model for sensitivity determination of anticancer agents against chemical-induced colon cancer in rats].
abstract: Chemically-induced colon cancer was used to test the sensitivity of tumors to chemotherapeutic agents. Thirty-four Sprague-Dawley rats received dimethylhydrazine (40 mg/kg) s.c. once weekly for 10 weeks to induce colon cancer. Twenty weeks after beginning the carcinogen treatment, a barium enema was performed to determine the size of colon tumors. The animals were divided into CDDP group and CPT-11 group, in which the maximum tolerable dose of each drug was given. After 5 weeks of treatment, the barium enema was repeated. "Response" was assessed on the basis of tumor doubling time. Response rates in the CDDP and CPT-11 groups were 6% and 35%, respectively. This reflects the clinical data of those drugs and confirms the results of our previous study. The present study may be a predictive model for screening anticancer drugs for human colorectal malignancy.
authors.affiliation: Dept. of Surgery, School of Medicine, Showa University.
authors.forename: A
authors.initials: A
authors.lastname: Tsunoda
authors.forename: M
authors.initials: M
authors.lastname: Shibusawa
authors.forename: M
authors.initials: M
authors.lastname: Takada
authors.forename: N
authors.initials: N
authors.lastname: Yokoyama
authors.forename: H
authors.initials: H
authors.lastname: Yoshizawa
authors.forename: K
authors.initials: K
authors.lastname: Nakao
authors.forename: H
authors.initials: H
authors.lastname: Choh
authors.forename: M
authors.initials: M
authors.lastname: Kusano
mesh_terms: D000818:Animals; D002166:Camptothecin / Q000031:analogs & derivatives* / Q000494:pharmacology; D002455:Cell Division / Q000187:drug effects; D002945:Cisplatin / Q000494:pharmacology*; D003110:Colonic Neoplasms / Q000139:chemically induced / Q000473:pathology*; D004127:Dimethylhydrazines; D004354:Drug Screening Assays, Antitumor; D000077146:Irinotecan; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D004127:Dimethylhydrazines; D000077146:Irinotecan; D002945:Cisplatin; D002166:Camptothecin