A132 A COLON-SPECIFIC SELECTIVE RESECTION ALGORITHM FOR LARGE NON-PEDUNCULATED POLYPS OPTIMIZES EFFICIENCY WITH HIGH TECHNICAL AND CLINICAL SUCCESS: A PROSPECTIVE COHORT STUDY

TL;DR

A new algorithm for removing large non-pedunculated colonic polyps improves efficiency and success rates using specific endoscopic techniques.

Contribution

A colon-specific selective resection algorithm is introduced and evaluated for large non-pedunculated colonic polyps.

Findings

Technical success rates were high across EMR, CSR, and ESD procedures.

CSR procedures were significantly faster than EMR and ESD.

Low recurrence rates and minimal adverse events were observed.

Abstract

Endoscopic resection is now the first line treatment strategy for most large (≥20 mm) non-pedunculated colonic polyps (LNPCPs); which includes endoscopic mucosal resection (EMR), cold snare resection (CSR), and endoscopic submucosal dissection (ESD). A selective resection algorithm incorporating EMR and ESD is cost effective and optimizes oncologic outcomes in the rectum. However, a focused evaluation for colonic lesions has not been described.

Assess the performance of a colon-specific selective resection algorithm for LNPCPs.

Consecutive patients ampersand:003E 18 years of age who underwent endoscopic resection for a LNPCP were enrolled in a prospective single center observation cohort study (clinicaltrials.gov ID: NCT05402696). Modality selection was determined by optical evaluation using the Paris and the Japan NBI Expert Team (JNET) classifications: 1) JNET I – CSR; 2) JNET IIA – EMR; 3) JNET IIB or Paris 0-IIC morphology – en bloc resection (EMR/ESD); 4) JNET III – referral to surgery/multi-disciplinary team review. Algorithm performance was evaluated by technical success (all neoplastic tissue removed at index procedure), procedure-related adverse events, referral to surgery, and recurrence at first surveillance colonoscopy (SC1).

From 06/2022-09/2023, 230 patients underwent 244 procedures for 295 lesions. Median age was 67 years (IQR 61-74 years) and 127 (55.2%) were male. Median lesion size was 30mm (IQR 20-40mm). Cancer was identified in 12 (4.1%) LNPCPs. Based on pre-resection optical evaluation, 204 (69.2%), 86 (29.2%) and 5 (1.7%) LNPCPs underwent EMR, CSR and ESD, respectively. Technical success was 97.1%, 100.0% and 100.0% for EMR, CSR and ESD, respectively (p=0.245). Procedure duration was significantly shorter for CSR (10 min; IQR 8-15 min) compared to EMR (15 min; IQR 10-25 min) and ESD (30 min; IQR 30-60 min) (P ampersand:003C 0.001). There was no significant difference in intra-procedural perforation, clinically significant post-endoscopic resection bleeding, delayed perforation or serositis, with overall frequencies of 3.4%, 5.2%, 0% and 0.4% respectively. Surgery was performed for 15 lesions (11 submucosal invasive cancer (SMIC); 3 synchronous SMIC; 1 technical failure). Of LNPCPs completing SC1, there was 1 recurrence (1.2%) in the CSR group (p=0.366), which was successfully managed endoscopically.

A colon-specific selective resection algorithm optimizes procedural efficiency and the risk-benefit profiles of EMR, CSR and ESD for LNPCPs.

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