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

Randomized phase II study of CPT-11 versus PTX versus each combination chemotherapy with S-1 in patients with advanced gastric cancer refractory to S-1 or S-1 plus CDDP（OGSG0701）

Randomized phase II study of CPT-11 versus PTX versus each combination chemotherapy with S-1 in patients with advanced gastric cancer refractory to S-1 or S-1 plus platinum (OGSG0701)

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)

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)

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）

Stage IIIA, IIIB胃癌に対する S-1+CPT-11併用術後補助化学療法 第II相臨床試験（OGSG0801）