Abstract
Background and study aims Endoscopic mucosal resection of large non-pedunculated colorectal polyps is characterized
by a high risk of recurrence. Thermal ablation of the mucosal defect margins may reduce
recurrence in these lesions, but a systematic overview of the current evidence is
lacking.
Methods We searched PubMed, Embase and Cochrane until July 2021, for studies on thermal ablation
of mucosal defect margins of large non-pedunculated colorectal polyps. Main goal of
this meta-analysis was to identify pooled risk difference of recurrence between thermal
ablation vs. no adjuvant treatment. Secondary goal was to identify pooled recurrence
rate after snare tip soft coagulation (STSC) and argon plasma coagulation (APC).
Results Ten studies on thermal ablation of mucosal defect margins were included, with three
studies on argon plasma coagulation, six studies on snare tip soft coagulation and
one study comparing both treatment modalities, representing a total of 316 APC cases
and 1598 STSC cases. Overall pooled risk difference of recurrence was –0.17 (95 %
confidence interval [CI] –0.22 to –0.12) as compared to no adjuvant treatment. Pooled
risk difference was –0.16 (95 % CI –0.19 to –0.14) for STSC and –0.26 (95 % CI –0.80
to 0.28) for APC. Pooled recurrence rate was 4 % (95 % CI 2 % to 8 %) for STSC and
9 % (95 % CI 4 % to 19 %) for APC.
Conclusions Thermal ablation of mucosal defect margins significantly reduces recurrence rate
in large non-pedunculated colorectal lesions compared to no adjuvant treatment. While
no evidence for superiority exists, STSC may be preferred over APC, because this method
is the most evidence-based, and cost-effective modality.