TS-1単独、TS-1/CDDP併用療法に抵抗性の進行再発胃癌に対する二次治療の無作為化第II相試験（OGSG0701）
2007
進行・再発大腸癌に対するCPT-11+S-1併用化学療法の第Ⅱ相試験（OGSG0405）
TS-1抵抗性の進行・再発胃癌に対するPaclitaxel/Doxifluridine療法の第II相臨床試験（OGSG0302）
Multi-Center Phase II Study for Combination Therapy with Paclitaxel/Doxifluridine to Treat Advanced/Recurrent Gastric Cancer Showing Resistance to S-1 (OGSG0302)
Multi-center, phase II study for combination therapy with paclitaxel/doxifluridine to treat advanced/recurrent gastric cancer showing resistence to S-1: Final results (OGSG0302)
Multicenter phase II study of irinotecan plus bolus fluoroutacil/l-leucovorin for metastasic colorectal cancer（OGSG0201）
Multicenter phase II study of 2 weeks administration with TS-1 followed by 1 week rest against metastatic gastric cancer
Phase I/II Study of CPT-11 plus UFT in Patients with Advanced/Recurrent Colorectal Cancer: Osaka Gastrointestinal Cancer Chemotherapy Study Group（OGSG0102）