FU、プラチナ療法不応の進行再発食道癌に対するDOC療法とPTX療法の比較第II相試験（OGSG1201）

Randomized phase II study of CPT-11 versus PTX: +/- S1 in advanced gastric cancer refractory to S1 or S1 + platinum (OGSG0701)

Three-year outcomes of a phase Ⅱ study of adjuvant chemotherapy with S-1 plus docetaxel for stage Ⅲ gastric cancer after curative D2 gastrectomy

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)