title: [Chemosensitivity testing for 5-FU and 5-FU derivatives using subrenal capsule assay].
abstract: An evaluation was made, using in vivo subrenal capsule (SRC) assay, of the chemosensitivity of 12 human neoplastic tissues including 7 gastric cancers, 2 colo-rectal cancers, 2 lung cancers and 1 breast cancer, exposed to 5-fluorouracil (5-FU) and the 5-FU derivatives: tegafur (FT), UFT and hexylcarbamoyl-5-FU (HCFU). The relative variation of tumor size (delta TS/TS0) was calculated as follows: delta TS/TS0 = (TS6-TS0)/TS0 X 100 (%), where TS6 was the tumor size on day 6 and TS0 that on day 0, and more than a 10% decrease of delta TS/TS0 in the treated group was considered as positive for chemosensitivity. Delta TS/TS0 was decreased to -10.9 +/- 11.3% (mean +/- standard deviation) for 5-FU, -13.0 +/- 16.4% for FT, -19.8 +/- 18.2% for UFT and -18.8 +/- 15.1% for HCFU, and the inhibition of tumor growth following exposure to 5-FU correlated well with that following exposure to 5-FU derivatives (5-FU vs. FT, r = 0.659; 5-FU vs. UFT, r = 0.864; 5-FU vs. HCFU, r = 0.729). However, the sensitivity of each tumor varied; for example, the chemosensitivity was positive for 5-FU derivatives, but negative for 5-FU, in some tissues. The SRC assay appears to be useful for selecting sensitive drugs from 5-FU and 5-FU derivatives for individual cancer patients.
mesh_terms: D000971:Antineoplastic Combined Chemotherapy Protocols; D003110:Colonic Neoplasms / Q000473:pathology; D003114:Colony-Forming Units Assay; D005472:Fluorouracil / Q000031:analogs & derivatives / Q000494:pharmacology*; D006801:Humans; D008175:Lung Neoplasms / Q000473:pathology; D013274:Stomach Neoplasms / Q000473:pathology; D005641:Tegafur / Q000494:pharmacology; D014410:Tumor Stem Cell Assay; D014498:Uracil / Q000494:pharmacology
chemical_list: D005641:Tegafur; D014498:Uracil; C017367:carmofur; D005472:Fluorouracil