A Prospective Clinical Study of Transthoracic Single-hole Assisted Laparoscopic Radical Gastrectomy for Siewert Ⅱ AEG

1. Surgery and oncology indicators,such as length of operation, intraoperative blood loss, transit thoracotomy or laparotomy rate, length of proximal tumor from esophageal resection margin, number of mediastinal lymph node dissections and the positive, number of abdominal lymph node dissections and the positive, tumor type and pathological stage, etc.; 2. Early postoperative recovery information ,such as time of first exhaust and defecation, time of leaving the bed, time of recovery of full and half-flow diet, time of removal of chest drainage tube, time of postoperative hospitalization, etc.