[A case of gastric cancer with peritoneal dissemination who achieved five-year survival by successive treatments with TS-1 alone and in combination with other drugs].

The patient was a 65-year-old male with gastric cancer. Peritoneal disseminations were detected during distal gastrectomy. CDDP and mitomycin C were administered into the peritoneal cavity. Administration of TS-1 was begun and continued without adverse effects. After 33 months, a high dose of CDDP was administered twice in combination with TS-1, because elevation of serum CEA levels and paraortic lymphnode swelling were observed for the first time. A partial response was obtained, but an elevation of CEA was seen again in three months. We then tried weekly administration of paclitaxel, and a complete response was achieved in three months. After three months'rest from chemotherapy, a third regrowth of the tumor was observed. Paclitaxel was ineffective, and so we opted for weekly administration of low-dose CDDP combined with TS-1, which led to the third recovery. Biweekly administration of CPT-11 combined with TS-1 followed the low-dose CDDP and was successfully continued five years after the surgery. The treatment course in this patient was fully suggestive for patients with advanced or recurrent gastric cancer because the use of newly available chemotherapeutic agents in turn was effective at each recurrence of the tumor and achieved five-year survival with minimal hospitalization.