Abstract
Background
Although endoscopic submucosal dissection (ESD) enables en bloc removal of colorectal neoplasms, its effectiveness for larger lesions (≥ 10 cm in diameter) is undetermined. We aimed to investigate the feasibility and safety of ESD for colorectal lesions ≥ 10 cm wide.
Methods
This retrospective study included 3591 consecutive colorectal lesions managed with ESD from June 2012 through December 2020. Clinicopathological characteristics and treatment outcomes were compared between lesions ≥ 10 cm wide and lesions 5–10 cm wide.
Results
There were 50 patients in the ≥ 10 cm group and 270 patients in the 5–10 cm group. Among patients in the ≥ 10 cm group, lesions were most often in the rectum (50.0%), and the laterally spreading tumor–granular nodular mixed type (LST-G-M) was most prevalent (41/50, 82%). Although patients in the ≥ 10 cm group a longer mean ESD procedure time (186.0 vs. 94.4 min, p < 0.001), the dissection speed was significantly higher in this group (0.50 vs. 0.41 cm2/min, p = 0.003). The en bloc and curative resection rates were comparable between the ≥ 10 cm and 5–10 cm groups (100% vs. 99.6% and 86.0% vs. 88.5%, respectively). Although the stenosis rate was higher in the ≥ 10 cm group (4% vs. 0%), the delayed bleeding and perforation rates were similar between the two groups.
Conclusions
ESD for colorectal lesions ≥ 10 cm wide is feasible and curative, even though it is associated with higher technical difficulty and longer procedure times compared with ESD for smaller lesions (Number: UMIN 000044313).

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Acknowledgements
The authors would like to thank the staff of the participating institutions for their support in recruiting eligible patients, and also the patients who participated in this study.
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This study was not externally funded. There was no sponsor for this study.
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Hideyuki Chiba, Ken Ohata, Jun Tachikawa, Keiji Yamada, Naoya Okada, Jun Arimoto, Keiichi Ashikari, Hiroki Kuwabara, Michiko Nakaoka, Eiji Sakai, and Toru Goto have no conflicts of interest or financial ties to disclose.
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Chiba, H., Ohata, K., Tachikawa, J. et al. The feasibility of endoscopic submucosal dissection for colorectal lesions larger than 10 cm. Surg Endosc 36, 5348–5355 (2022). https://doi.org/10.1007/s00464-021-08916-x
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DOI: https://doi.org/10.1007/s00464-021-08916-x