- 1. Impairment of gastrointestinal function or gastrointestinal disease that may significantly alter the absorption of TS-1 (e.g., ulcerative disease, uncontrolled nausea, vomiting, diarrhea, malabsorption syndrome or small bowel resection) 2. Subject with reproductive potential (male or female) not using adequate contraceptive measures 3. Pregnancy and breast-feeding 4. Other serious illness or medical condition, notably heart or lung failure, active uncontrolled infection (infection requiring antibiotics) 5. History of significant cardiac disease, arrhythmias and angina pectoris 6. Past or concurrent history of other neoplasm, except curatively treated basal cell skin cancer or adequately treated in-situ carcinoma of the cervix 7. Other concomitant anticancer agent 8. Subjects who cannot be regularly followed up for psychological, social, familial or geographic reasons 9. Patients who are using other investigational agents or who had received investigational drugs ≤ 4 weeks prior to first study treatment