Abstract:Abstract: Objective To explore the clinical efficacy and security of submucosal tunneling endoscopic resection (STER) in treatment of upper gastrointestinal submucosal tumors (SMT). Methods Clinical data of 32 cases that diagnosed as SMTs by endoscope, endoscopic ultrasonography and CT in the upper gastrointestinal and treated with STER from March 2014 to December 2017 were analyzed retrospectively. Their lesion origin, size, pathology, operation time, complications were involved. Results Among the 32 cases, 24 origined from muscularis propria layer, 8 from submucosal layer. They included 31 single tumors and 1 double tumors. All of the 32 cases were completely resected by STER. The mean size of the tumors was 1.24 cm (range 0.60 ~ 2.50 cm). The mean operation time of STER was 41.6 min (range 20.00 ~ 120.00 min). During the procedure, a mean number of 5.9 (range 4 ~ 20) hemostatic clips were used to suture the mucosal incision. Pathological results showed that the tumors were leiomyoma (n = 26), gastrointestinal stromal tumors (n = 5), neurilemmoma (n = 1), lipoma (n = 1). The complications postoperation were subcutaneous emphysema (n = 1), pneumothorax (n = 1), retrosternal pain ( n = 21). No submucosal hematoma, infection or digestive tract fistula occured. Conclusion STER is a safe and effective way to treat SMTs. It can completely remove lesions, and has advantages of short operative time, small trauma and quick recovery. The short-term curative effect is positive, and long-term effect needs further follow-up.