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Depth of the cutting plane with underwater and conventional endoscopic mucosal resection: Post‐hoc analysis of a randomized study

A multicenter randomized controlled trial reported a better R0 resection rate for intermediate‐sized (10–20 mm) colorectal polyps with underwater endoscopic mucosal resection (UEMR) than conventional endoscopic mucosal resection (CEMR). To clarify whether UEMR removes enough submucosal tissue in the removal of unpredictable invasive cancers, we investigated the cutting plane depth with UEMR versus CEMR.