SOX as Adjuvant Chemotherapy for Resectable Gastric Cancer

Inclusion Criteria: * 20-70 years * Histologically proven adenocarcinoma of the stomach * Curative D2 lymphadenectomy resection for gastric cancer, who can start chemotherapy be within 6 weeks after surgery * Stage II, III (AJCC 7th edition) * Eastern Cooperative Oncology Group (ECOG) performance status of 0-1 * No prior chemotherapy or radiotherapy * Adequate bone marrow, renal, and liver function Exclusion Criteria: * Any evidence of metastatic disease (including presence of tumor cells in the ascites). * Previous cytotoxic chemotherapy, radiotherapy or immunotherapy except corticosteroids, for the currently treated gastric cancer. * Major surgery within 4 weeks prior to study treatment start, or lack of complete recovery from the effects of major surgery. * Pregnant or lactating women. * History of another malignancy within the last five years except cured basal cell carcinoma of skin and cured carcinoma in-situ of uterine cervix. * Lack of physical integrity of the upper gastrointestinal tract or those who have malabsorption syndrome likely to influence absorption of capecitabine, or inability to take oral medication. * Organ allografts requiring immunosuppressive therapy. * Serious uncontrolled intercurrent infections or other serious uncontrolled concomitant disease. * Prior unanticipated severe reaction to fluoropyrimidine therapy (with or without documented dihydropyrimidine dehydrogenase (DPD) deficiency) or patients with known DPD deficiency. Hypersensitivity to platinum compounds or any of the components of the study medications. * Received any investigational drug or agent/procedure, i.e. participation in another trial, within 4 weeks before enter the trial.