Phase II Study for Robot Assisted Distal Gastrectomy

Inclusion Criteria: 1. Biopsy specimen from the primary lesion shows adenocarcinoma 2. Diagnosed as Stage IA early gastric cancer according to the preoperative esophagogastroduodenoscopy and computer tomography 3. Endoscopic submucosal dissection is not indicated 4. Tumor was located within lower two thirds of stomach 5. Not having duodenal invasion 6. Eastern clinical oncology group performance status is 0 or 1 7. Body mass index is lower than 30 8. No prior laparotomy 9. No prior chemotherapy or radiation including those for other cancers 10. Fulfil all following conditions WBC \> 3,000/mm3 Plt \> 100,000/mm3 AST \< 100 IU/L ALT \< 100IU/L T.Bil \< 2.0 g/dl Cre \< 1.5mg/dl Exclusion Criteria: 1. Having other active cancers 2. Possibly pregnant, or breast feeding woman 3. with psychiatric disorder 4. Receiving steroids 5. With Acute myocardial infarction in 6 months or with unstable angina 6. With uncontrolled hypertension 7. With uncontrolled diabetes mellitus 8. With pulmonary disease which require continuous oxygen therapy