Clinical outcomes of circumferential endoscopic submucosal dissection in esophageal squamous cell carcinoma > 50 mm: Retrospective cohort study.

Background and study aims: This study aimed to assess both short-term safety and long-term outcomes of whole circumferential endoscopic submucosal dissection (WC-ESD) for esophageal squamous cell carcinoma (ESCC) with tumor length > 50 mm, and to evaluate effectiveness of aggressive prophylactic dilation combined with steroid therapy in preventing esophageal stricture. Patients and methods: A retrospective review was conducted on 67 patients who underwent WC-ESD for superficial ESCC between 2009 and 2019 at a single Japanese center. Patients were categorized into > 50-mm and ≤ 50-mm groups. The primary endpoint was incidence of post-ESD stricture in the main analysis excluding surgery/chemoradiotherapy cases within 90 days; sensitivity analysis included all patients. Secondary endpoints were number of dilations, steroid use, and long-term survival outcomes (overall survival [OS], disease-specific survival [DSS], relapse-free survival [RFS]). Results: Stricture incidence was not significantly different (> 50 mm vs. ≤ 50 mm: 13% vs. 18%, Conclusions: WC-ESD for superficial ESCC with a tumor length > 50 mm did not increase adverse events and provided comparable long-term survival. These findings support feasibility beyond guideline limits and emphasize further refinement of stricture prevention.