We report the case of a 58-year-old male with Stage IV gastric cancer accompanied by multiple liver metastases, which responded to chemotherapy using TS-1. The patient was treated with daily oral administration of 120 mg TS-1 for 4 weeks followed by 2 weeks rest as 1 cycle. After 4 cycles, most of the liver metastases had disappeared and serum CEA level was reduced from 140 to 53.9. The patient received chemotherapy at our outpatient clinic for 9 months during which time there was no regrowth after the first treatment. The current case suggests that TS-1 may have a potent therapeutic efficacy in cases of advanced gastric cancer.
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