Salvage endoscopic submucosal dissection for local residual/recurrent colorectal tumor after endoscopic resection: Large multicenter 10‐year study

Objectives For local residual/recurrent and endoscopic resection (ER) interrupted colorectal tumors, endoscopic retreatment is often difficult due to severe submucosal fibrosis. Endoscopic submucosal dissection (ESD) can achieve en bloc resection, even for tumors with severe submucosal fibrosis, although it is a risk factor for incomplete resection and perforation. We aimed to determine the safety and efficacy of colorectal ESD for local residual/recurrent tumors including ER interrupted tumors from a large multicenter study. Methods From January 2008 until December 2018, 3,937 colorectal tumors were resected by ESD at the Hiroshima GI Endoscopy Research Group. From this group, 81 local residual/recurrent tumors and 21 ER interrupted tumors were included. We analyzed ESD outcomes, particularly the difference between the early and late phases and re‐recurrence after ESD for local residual/recurrent tumors. Results For local residual/recurrent tumors, en bloc and R0 resection rates were 95% (77/81) and 90% (73/81), respectively. The intraoperative perforation rate was 6% (5/81), and one patient required surgery. The delayed perforation rate was 2% (2/81), and one patient required surgery. For ER interrupted tumors, both the en bloc and R0 resection rates were 86% (18/21), with no major adverse events. For local residual/recurrent and ER interrupted tumors, the intraoperative perforation rate was significantly lower in the late phase compared with the early phase. Following curative resection for local residual/recurrent tumors, no local re‐recurrences occurred. Conclusions Colorectal ESD is an effective treatment for local residual/recurrent and ER interrupted tumors.