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)

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）

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

Randomized phase II trial of S-1 plus irinotecanversus S-1 plus paclitaxelas first-line treatment for advanced gastric cancer (OGSG0402)

Phase I/II study of weekly taxol plus irinotecan for patients with advanced of recurrent gastric cancer (OGSG0104)

A feasibility/phase II study of UFT/LV and irinotecan (TEGAFIRI) in advanced or metastatic colorectal cancer (CRC) (OGSG 0304)

Preventive effect of Carbamazepine for neurotoxicity of modified FOLFOX6 of metastatic colorectal cancer (mCRC): a prospective phase II study (OGSG 0603 study)

Phase II study of bi-weekly CPT-11+CDDP for patients with gastric cancer refractory to S-1 (OGSG 0504 study)

進行・再発胃癌に対するS-1＋CPT-11療法とS-1＋TXL療法とのランダム化比較第II相試験（OGSG0402）