title: Enhanced accumulation of 5-fluorouracil in human tumors in athymic mice by co-administration of Ftorafur and uracil.
abstract: Human colonic tumors grown in athymic mice were tested for the effect of coincident uracil (U) and Ftorafur (FT) exposure versus FT alone on 5-Fluorouracil (5-FU) metabolism. Serum and tumor FT and 5-FU levels were studied as a function of time after FT +/- U injections. The combination of U + FT led to significantly higher tumor/serum 5-FU ratios than FT alone. The data indicate that the metabolism of 5-FU released from FT can be modulated by coincident U exposure in human tumor cells in vivo. Such combinations may be of use in the development of oral 5-FU pro-drugs for applications using 5-FU as an out-patient non-invasive radiosensitizer.
mesh_terms: D000818:Animals; D003110:Colonic Neoplasms / Q000097:blood / Q000188:drug therapy* / Q000378:metabolism; D004359:Drug Therapy, Combination; D005472:Fluorouracil / Q000031:analogs & derivatives* / Q000097:blood / Q000378:metabolism; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D005641:Tegafur / Q000627:therapeutic use*; D013997:Time Factors; D014183:Transplantation, Heterologous; D014498:Uracil / Q000627:therapeutic use*
chemical_list: D005641:Tegafur; D014498:Uracil; D005472:Fluorouracil