Piecemeal Resection and Advanced Histology Independently Predict Local Recurrence After Colorectal Snare-based Endoscopic Resection: a Time-to-event Cohort Study

Prior treatment

• Patients undergoing techniques other than loop polypectomy, such as: Endoscopic submucosal dissection (ESD), advanced mucosal resection not based on conventional loop, primary surgical resection of the lesion;

Other illness

• Invasive lesions beyond the mucosa (invasive cancer with deep submucosal invasion) that have been referred for immediate surgical treatment without endoscopic follow-up;

Other

• Absence of follow-up colonoscopy, making it impossible to assess the primary outcome (local recurrence);
• Incomplete clinical, endoscopic, or histopathological data that prevent adequate classification of study variables;
• Loss to follow-up before the first surveillance colonoscopy.

• Age ≥ 18 years at the time of polypectomy;
• Underwent snare polypectomy, with or without the use of thermal energy (cold snare or hot snare), performed during the study period (2023-2025);
• Procedure performed at a participating tertiary center, ensuring technical and record standardization;
• Availability of histopathological examination of the resected lesion, allowing for adequate histological characterization;
• Performance of at least one documented surveillance colonoscopy, with evaluation of the previous resection site;
• Adequate recording of clinical and endoscopic variables necessary for analysis (lesion size, location, resection technique, etc.);