A Phase I/II Trial of Radiotherapy Concurrent with TS-1 Plus Cisplatin in Patients with Clinically Resectable Type 4 or Large Type 3 Gastric Cancer: Osaka Gastrointestinal Cancer Chemotherapy Study Group（OGSG1205）

A phase ll study of trastuzumab in combination with triweekly S-1 plus CDDP in HER2-positive advanced gastric cancer ; OGSG1101, HGCSG1102, T-CORE1101 Intergroup study (HERBIS-1 trial)

A phase ll study of trastuzumab in combination with triweekly S-1 plus CDDP in HER2-positive advanced gastric cancer ; OGSG1101, HGCSG1102, T-CORE1101 Intergroup study (HERBIS-1 trial)

A phase ll study of new combination regimen with trastuzumab, S-1 and CDDP in HER2- positive advanced gastric cancer; OGSG1101, HGCSG1102, T-CORE1101 Intergroup study (HERBIS-1 trial)

幽門側胃切除術における 予防抗菌薬投与に関する 第III相比較試験（OGSG0501）

Multicenter phase II study of triplet combination chemotherapy with paclitaxel, cisplatin, and S-1 for advanced gastric cancer (OGSG0703)

A phase ll study of Trastuzumab in combination with triweekly S-1 plus CDDP in HER2-positive advanced gastric cancer; OGSG1101, HGCSG1102, T-CORE1101 Intergroup study(HERBIS-1 trial)

A Phase I study of triplet combination chemotherapy of paclitaxel, cisplatin and S-1 in patients with advanced gastric cancer

Prospective randomized trial of preoperative enteral immunonutrition followed by elective total gastrectomy for gastric cancer（OGSG0507）

Intraoperative versus extended antimicrobial prophylaxis after gastric cancer surgery: a phase 3, open-label, randomised controlled, non-inferiority trial（OGSG0501）