Inclusion Criteria:  Diagnosed as gastric adenocarcinoma Involving the esophagogastric junction or gastric cardia Age 18 - 80 years Anticipated to undergo laparoscopic total or proximal gastrectomy cT1-T4a  Exclusion Criteria:  Previous history of gastrectomy Neoadjuvant chemotherapy or radiotherapy for gastric cancer Invasion to other organs Open conversion