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Background: Gastric submucosal tumors (SMTs) originating from the muscularis propria layer can be treated under endoscope.The successful closure of the wall defect is a critical step.This study was to evaluate the safety and feasibility of endoscopic purse-string suture (EPSS) method with an endoloop and several metallic clips after endoscopic full-thickness resection (EFTR) or perforation due to endoscopic submucosal direction (ESD).Methods: Thirty patients with SMT originating from the muscularis propria layer receiving EFTR or ESD were retrospectively analyzed from December 2009 to April 2013.After resecting the tumor successfully, an endoloop was anchored onto the circumferential margin of the gastric defect with several metallic clips and then it was tightened gently.Patient characteristics, tumor size, en bloc resection, and postoperative complications were evaluated.Results: EPSS was successfully performed in all the 30 patients following the EFTR or perforation due to ESD.The mean size of the resected specimen was 1.9 cm in diameter.There was no severe complication during or after the procedure.One month after the procedure, the lesions all healed comfirmed by endoscope.Conclusion: The EPSS with an endoloop and clips is thought to be effective and safe as a closure method for closing the gastric defect after EFTR or perforation due to ESD.