Albouys J, Manzah I, Schaefer M, Legros R, Masrour O, Henno S, Leclercq P, Dahan M, Guyot A, Charissoux A, Grainville T, Loustaud-Ratti V, Lepetit H, Geyl S, Carrier P, Pioche M, Wallenhorst T, and Jacques J
Background and Aims: The muscle retracting sign (MRS) can be present during endoscopic submucosal dissection (ESD) of macronodular colorectal lesions. The prevalence of MRS and its pathologic and clinical implications is unclear. This study evaluated the effect of MRS on the technical and clinical outcomes of ESD., Methods: All patients referred for ESD of protruding lesions or granular mixed lesions with >10 mm macronodule granular mixed laterally spreading tumors (LST-GMs) in 2 academic centers from January 2017 to October 2022 were prospectively included. Size of the macronodule was analyzed retrospectively. The primary outcome was the curative resection rate according to MRS status. Secondary outcomes were R0 resection, perforation, secondary surgery rate, and risk factors for MRS., Results: Of 694 lesions, 84 (12%) had MRS (MRS+). The curative resection rate was decreased by MRS (MRS+ 41.6% vs lesions without MRS [MRS-] 81.3%), whereas the perforation (MRS+ 22.6% vs MRS- 9.2%), submucosal cancer (MRS+ 34.9% vs MRS- 9.2%), and surgery (MRS+ 45.2% vs MRS- 6%) rates were increased. The R0 resection rate of MRS+ colonic lesions was lower than that of rectal lesions (53% vs 74.3%). In multivariate analysis, protruding lesions (odds ratio, 2.47; 95% confidence interval, 1.27-4.80) and macronodules >4 cm (odds ratio, 4.24; 95% confidence interval, 2.23-8.05) were risk factors for MRS., Conclusions: MRS reduces oncologic outcomes and increases the perforation rate. Consequently, procedures in the colon should be stopped if MRS is detected, and those in the rectum should be continued due to the morbidity of alternative therapy., Competing Interests: Disclosure The following authors disclosed financial relationships: J. Albouys: support for meeting from Amgen; consulting for Boston Scientific; remunerated lecture for Fujifilm; and ESD training for Erbe. M. Schaefer: Consultant for AbbVie; honoraria from Alfasigma, Boston Scientific, Duomed Endoscopy, Erbe Medical, Ferring, and Norgine; and meeting support from Boston Scientific, Cook, Cousin Endoscopy, Erbe, Ipsen, Janssen, Medtronic, Olympus, MSD, and Takeda R. Legros: training event for Pentax Medical, Fujifilm, Erbe, Olympus; and consulting for Boston Scientific. P. Leclercq: speaker fee and advisory board for Medtronic; speaker fee for Erbe; and travel grant from Olympus. M. Dahan: remunerated lecture for MSD; meeting support from Amgen; and training event for Fujifilm. A. Guyot: remunerated lecture for MSD. P. Carrier: consulting for AbbVie; support for meeting from Ipsen; and remunerated lecture for Gilead. V. Loustaud-Ratti: consulting for AbbVie and Gilead; and remunerated lecture for Ipsen. H. Lepetit: remunerated lecture for Fujifilm; and ESD training for Erbe. S. Geyl: remunerated lecture for AbbVie, Galapagos, and Ipsen; and support for meeting from Janssen and Takeda. T. Wallenhorst: training event for Fujifilm and Olympus; and support for meeting from AbbVie. M. Pioche: training event for Olympus, Fujifilm, and Viatris; and educational purposes for Boston Scientific, Olympus, Norgine, and AlfaSigma. J. Jacques: training event for Pentax Medical, Fujifilm, Erbe, and Olympus; and consulting for Boston Scientific. All other authors disclosed no financial relationships., (Copyright © 2024. Published by Elsevier Inc.)