Extended cold snare polypectomy for small colorectal polyps increases the R0 resection rate

Background and study aims Despite widespread use of cold snare polypectomy (CSP), the R0 resection rate is not well documented. We perform extended CSP, resecting polyps with a >1mm circumferential margin. The aim of this study is to compare the R0 resection rate of extended CSP with conventional CSP and to assess safety. Patients and methods From April 2014 to September 2016, 712 non-pedunculated colorectal polyps,<10mm in size, resected using CSP from 316 patients were retrospectively analyzed. Results We divided lesions into conventional CSP (n=263) and extended CSP groups (n=449). The baseline characteristics of these two groups were not significantly different in univariate or multivariate analyses. Sessile polyps comprised 94% (668/712), and the remaining were flat-elevated polyps. Mean size of polyps (standard deviation) was 4.2 +/- 1.5mm. The most frequent pathology was low grade adenoma (97%, 689/712). The R0 resection rate was significantly higher in the extended CSP group (439/449 [98%]) than in the conventional CSP group (222/263 [84%], P <0.001). There was no delayed bleeding or perforation in either group (conventional CSP group, 0/263, 95% confidence interval: 0.0-1.4% and extended CSP group, 0/449, 95% confidence interval: 0.0-0.8%). Conclusions Extended CSP results in a higher R0 resection rate compared with conventional CSP. Extended CSP did not result in a higher rate of delayed bleeding or perforation. Extended CSP is a safe and promising procedure for endoscopic resection of non-pedunculated colorectal polyps <10mm in size