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RESULTS Patients with ECE(+) showed significantly worse 3-year overall survival (OS) and disease-free survival (DFS) than those without ECE. In the sensitivity analysis, ECE had independent prognostic value for both 3-year OS and 3-year DFS, whereas ECE grading showed little impact on mortality trend or disease progression trend. The ECE-based nomogram showed a significantly higher C-index than the pathological tumor and node staging (pTN) staging system. CONCLUSIONS The adverse prognostic impact of ECE was validated. Sub-serosal tumor