Endoscopic Mucosal Resection For People with Colonic Polyps.

To perform a comprehensive review of our Endoscopic Submucosal Resection (EMR) practice, in particular to determine the safety, efficacy and outcomes, including polyp recurrence at our institution for polyps greater than 20mm undergoing EMR. The primary outcome will be establishing the proportion of patients who have bleeding and/or perforation. In addition, we wish to define risk factors for both complication and failed/unsuccessful EMR (defined as initial incomplete removal OR recurrence at scheduled surveillance follow-up). Participants will not be required to perform any additional tasks in this study. The total duration of observation for the study will be 1 year post the date of the procedure. All patients in this study will receive usual standard of care practice with EMR - there will be no alteration in practice or data collected.