S-1, Oxaliplatin, and Irinotecan for Advanced Gastrointestinal Cancer

"Dose level 1 treatment will be delivered as a 2-week cycle as bellows;~1. Oxaliplatin 85 mg/m²IV on day 1~2. Irinotecan 120 mg/m² IV on day 1~3. S-1 60 mg/m2/day PO on day 1-7~Dose escalation will be continued until more than one-third of the patients in a given cohort show dose limiting toxicities (DLT) during treatment cycle 1. If at least 2 patients are observed to have DLT, this dose level is defined as the maximum tolerated dose (MTD). If exactly 1 of the 3 patients treated show DLT, 3 additional patients are treated at the current dose level."