Inclusion Criteria:  Patients diagnosed with type 2 diabetes as well as pathologically proven gastric cancer of clinical stage I according to the AJCC 8th edition Those who are expected to undergo laparoscopic distal gastrectomy  Exclusion Criteria:  baseline fasting C-peptide level < 1.0 ng/dL (who had the possibility of type 1 diabetes) previous radiotherapy or surgery at upper abdomen other than laparoscopic cholecystectomy other malignancies in recent 5 years vulnerable patients (pregnant women, those with cognitive impairment, etc) ECOG-PS ≥ 2 participating in other clinical trials within 6 months