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Current knowledge and future perspective for establishing a novel algorithm for older patients with non-curative ER for SESCC or EGC. CCI, Charlson comorbidity index; EGC, early gastric cancer; ER, endoscopic resection; ESCC, esophageal squamous cell carcinoma; PNI, prognostic nutrition index; QoL, quality of life; SESCC, superficial esophageal squamous cell carcinoma.
