Recent studies demonstrated the efficacy of S-1-based adjuvant chemotherapy administered for six months after curative surgery for stage III gastric cancer; however, it is unproven whether this type of combination chemotherapy is more effective than the standard adjuvant chemotherapy of S-1 for one year. | Treatment using oxaliplatin and S-1 adjuvant chemotherapy for pathological stage III gastric cancer A multicenter phase II study TOSA trial protocol