Abstract:Abstract: Objective?To investigate the efficacy and safety of submucosal tunneling endoscopic resection (STER) in treatment of submucosal tumors of esophagus and cardia.?Methods?Clinical data of 50 patients with SMTs of esophagus and cardia treated with STER from Septemper 2012 to June 2018 were collected and analyzed.?Results?50 cases were completed with STER. There were 33 cases of esophageal lesions, 17 cases of cardiac and gastric fundus lesions, 1 of which had 2 tumors, and the others had single tumor. All these lesions were successfully resected by STER with en bloc resection rate of 96.0%. The operation time was 32?~?115 min, average (54.0?±?24.5) min. The submucosal tunnel entrance was sutured by 4?~?8 metal clips. The average was (5.6?±?2.1) pieces. The postoperative tumor diameter ranged from 0.8?~?3.3 cm, average (1.6?±?0.4)?cm. 40 cases (80.0%) were confirmed as leiomyoma by routine pathology and immunohistochemical staining postoperative speimens, 7 cases (14.0%) were stromal tumor, 2 cases (4.0%) were esophageal bronchogenic cyst, and 1 case (2.0%) was calcified fibrous tumor, all the cutting edges were negative. 4 patients developed gastrointestinal perforation during operation, 3 patients developed subcutaneous emphysema during operation, and 3 patients developed fever after operation, all of which were cured by conservative treatment. The hospital stay was 6?~?15 days, the average was (7.8?±?3.7) days. ?Conclusion?STER method has a high complete resection rate for the treatment on SMTs of esophagus and cardia, with small trauma and quick recovery, and has short duration of hospital stay and less complications.