腹膜転移を伴う高度進行・再発胃癌におけるS-1+Paclitaxel併用療法のFeasibility試験（OGSG0401）

Phase II study of docetaxel and cisplatin and fluorouracil for metastatic esophageal cancer（OGSG0403）

Phase I study of S-1, cisplatin, and paclitaxel in patients with advanced gastric cancer（OGSG0703）

Phase II study of weekly paclitaxel as third-line chemotherapy for advanced or recurrent gastric cancer（OGSG0602）

Phase II trial of S-1 for elderly patients over 75 years with advanced gastric cancer as first-line treatment（OGSG0404）

Phase III Trail of perioperative alone compared with perioperative plus postoperative antimicrobial prophylaxis in gastric cancer surgery (OGSG0501)

A Feasibility Study of UFT/LV and Irinotecan (TEGAFIRI) in Advanced or Metastatic Colorectal Cancer: Osaka Gastrointestinal Cancer Chemotherapy Study Group (OGSG) PROG 0304