The Endoscopic Submucosal Dissection (ESD) procedures will be performed with the devices commonly used at the Services of Endoscopy of the Centers participating in the study. There are several models of knives on the market, produced by different companies, all considered equally effective by international guidelines.

The FTRD® (Full Thickness Resection Device; Ovesco Endoscopy, Tübingen, Germany) is the only over-the-scope device designed to undergo Endoscopic Full-Thickness Resection (EFTR) using a "clip-and-cut" technique. It consists of a 14 mm modified over-the-scope-clip (OTSC) mounted on the outside of a 23 mm cap, which has a preloaded 13 mm monofilament loop at the end. This device received the CE mark for the lower digestive tract in September 2014 and its efficacy and safety have been evaluated in preclinical studies and clinical trials.

Full Thickness Endoscopic Resection using the FTRD Ovesco Device

the rate of one-piece resection of the lesions

percentage of patients with histologically negative lateral and deep margins