The patient was a 44-year-old male with gastric cancer accompanied by pancreatic invasion and metastasis to the periaortic lymph nodes. Combination chemotherapy with 5-FU, leucovorin (LCV) and CDDP (FLP therapy) was preoperatively given. Pancreaticoduodenectomy was carried out as absolutely noncurative resection. FLP therapy was continued postoperatively, and resulted in disappearance of the metastases in the periaortic lymph nodes on CT. As there were no findings of recurrence, the patient was regarded as being in complete response. In addition, the performance status improved from Grade 2 to Grade 0. Since the three-drug combination therapy induced only slight adverse reactions (Grades 1-2), it could be safely carried out at the outpatient department. Thus, combination therapy with 5-FU, LCV and CDDP is thought to be effective against gastric cancer.