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

Phase II Study of a Combination of S-1 and Paclitaxel in Patients with Unresectable or Metastatic Gastric Cancer（OGSG0105）

Multi-Center Phase II Study for Combination Therapy with Paclitaxel/Doxifluridine to Treat Advanced/Recurrent Gastric Cancer Showing Resistance to S-1 (OGSG0302)

Phase II study of a combination of iIrinotecan and S-1 in patients with advanced gastric cancer (OGSG0002)