[Study of preoperative combination therapy with UFT + CDDP in patients with gastric and colorectal cancer--concomitant effects based on the thymidylate synthase inhibitory rat].

UNLABELLED: The subjects were 39 patients with gastric cancer and 44 patients with colorectal cancer divided into a group administered 400 mg/day of UFT orally for 2 weeks preoperatively (UFT group) and a group administered 400 mg/day of UFT as well as 40 mg/m2 (i.v.) of cisplatin (CDDP) by drip infusion once concomitantly (UFT + CDDP group). The thymidylate synthase (TS) inhibitory rate was measured in resected specimens and lymph nodes, and the concomitant effects of UFT and CDDP were investigated. RESULTS: 1) The TS inhibitory rate in tumor tissue showed no significant difference between the two groups. 2) The TS inhibitory rate of metastasized lymph nodes was higher in UFT + CDDP group than in the UFT group in gastric cancer patients (p < 0.05). The TS inhibitory rate by lymph node metastasis in patients with gastric cancer or colorectal cancer was significantly higher in metastasized lymph nodes than in non-metastasized lymph nodes in the UFT + CDDP group (p < 0.05 for gastric cancer, p < 0.05 for colorectal cancer). These results indicated that concomitant use of UFT and CDDP appeared to be more effective against metastasized lymph nodes, especially in cases of gastric cancer, than against the primary tumor focus.