[Antitumor effect of UFT on human ovarian cancer grafted to nude mice and 5-FU concentration in tumor and normal tissues].

Antitumor effects of UFT, tegafur (FT-207), cisplatin (CDDP) and the combination of UFT with CDDP on a human ovarian cancer xenograft in nude mice and the concentration of 5-FU in the tumor tissue and major organs were studied. UFT (48.6mg/kg/day X 20) or tegafur (15.0mg/kg/day X 20) was daily administrated orally, and CDDP (5mg/kg/day X 3) was administrated intraperitoneally at an 7-day interval. The inhibition rates of the tumor growths were 49.6% with UFT, -2.3% with tegafur and 17.7% with CDDP, respectively. In the combination of UFT with CDDP, severe side effect were observed. The concentration of 5-FU in UFT-treated group was higher than tegafur group: about 2 times in the tumor, 5 times in the liver, 9 times in the kidney and 4 times in the spleen, respectively. In the combination of UFT with CDDP, the concentration of 5-FU in major organs, especially in the kidney, in nude mice that died at 10 day after drug administration were higher than in those of UFT. These findings indicate that UFT increases the intratumoral concentration of 5-FU to elicit better antitumor effect and also the concentration of 5-FU in various normal organs after long time administration.