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(A) Survival analysis according to adjuvant therapy in ERM+: overall survival by adjuvant therapy staging system (ERM+ 1 versus ERM+ 0: Chi-square =5.480, P=0.019); (B) the average survival time of ERM+ patients who have adjuvant therapy comparable to average survival time of ERM− patients in stage I–II (68.556 versus 65.815 months). ERM+, positive esophageal proximal resection margin; ERM−, negative esophageal proximal resection margin.
