S-1; Oxaliplatin; 5-Fu; Leucovorin Calcium
DrugFOLFOX:
oxaliplatin 130mg/m2 on day 1, CF 400mg/m2 on day 1, 5-Fu 400mg/m2 on day 1; 5-FU 2400 mg/m2 46hr civ regimen repeated every 3 weeks Pre-operative chemotherapy: 2-4 cycles and peri-operative chemotherapy consist of 6 cycles
SOX:
oxaliplatin 130mg/m2 on day 1, S-1 for 14 days regimen repeated every 3 weeks Pre-chemotherapy: 2-4 cycles, totally 6 cycles of perioperative chemotherapy