Randomized control study comparing reconstruction procedures after esophagectomy -gastric tube reconstruction vs gastric tube reconstruction with duodenal diversion plus Roux-en Y anastomosis-

INTERVENTION: After patients are randomly allocated to RY and Non‐RY groups, RY group undergo gastric tube reconstruction with duodenal diversion plus Roux‐en anastomosis. After patients are randomly allocated to RY and Non‐RY groups, Non‐RY group undergo conventional gastric tube reconstruction after esophagectomy. CONDITION: Patients with resectable thoracic esophageal cancer who are planned to undergo esophagectomy with gastric tube reconstruction and 2 or 3 field lymphadenectomy PRIMARY OUTCOME: Postoperative QOL at 1year assessed by DAUGS‐32 questionare INCLUSION CRITERIA: 1. histologically proven esophageal cancer by endoscopic biopsy 2. resectable cases, cT1b‐3,Nany,M0 by preoperative staging, 3. preserve normal swallowing function and can eat and drink 4. 80 years old or younger 5. PS 0‐2 6. Vital organ functions within 7days before entry are preserved. 7. Written informed consentis ontained from each patient.