[A case of synchronous liver metastasis originating from advanced gastric cancer treated with combination chemotherapy involving S-1 and surgical intervention].

A 71-year-old man was diagnosed with gastric cancer[cT4, cN0, cH1(S6), cP0, cM0, cStage IV]and underwent distal gastrectomy with cholecystectomy, partial colectomy for the invasion to the mesentery of transverse colon, and partial hepatectomy for metastatic liver tumor(segment 6). Although chemotherapy with S-1+CDDP was administered after the operation, a recurrent lesion appeared in the remnant of liver(segment 6). The chemotherapy regimen was changed to S-1+CPT-11. Since the only recurrent tumor was found in the remnant liver, it was resected. After S-1 chemotherapy, no recurrence has been detected since the first operation. A good outcome was obtained for this patient with synchronous liver metastasis and the recurrence remnant liver originating from gastric cancer, possibly as a result of the combination of chemotherapy and surgical resection for the primary lesion and liver metastasis.