Endoscopic Mucosal Resection for Colonic Mucosal Neoplasia and Evaluation of Long-Term Recurrence: A Single-Center Experience of 500 Cases.

Objectives Endoscopic mucosal resection (EMR) is an alternative to surgery for the treatment of large laterally spreading lesions. Residual or recurrent adenoma is a major limitation. This study aimed to quantify early and late recurrences and to assess its associated risk factors. Methods The study was a single-center, multiendoscopist, longitudinal study conducted between January 1, 2013 and April 26, 2017. A total of 480 patients with 500 polyps who underwent an endoscopic resection were included. Surveillance colonoscopy (SC) was performed at 4 to 6 months (SC1) and 16 to 18 months (SC2). Results At SC1, early recurrence was noted in 77 of 354 (21.8%) lesions; 76 (98.7%) were treated endoscopically. The remaining 277 of 354 (78.2%) lesions had no recurrence at SC1; only 41 lesions (15%) were followed up at SC2. Recurrence at SC2 was found in 4 lesions (9.8%), all of which were treated endoscopically. Lesion size >40 mm was associated with recurrence. Recurrence at both SC1 and SC2 was successfully treated endoscopically in 78 of 81 lesions (96.3%). Conclusions EMR is an effective, minimally invasive technique for the treatment of large laterally spreading lesions. Although recurrence is a concern, its risk is low (21.8% on SC1 and 9.8% on SC2) and was managed endoscopically in 96.3% cases on follow-up endoscopy.