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Introduction Sarcopenia is a prognostic factor of esophageal carcinoma (EC) before surgery, with less convincing data reported before chemoradiotherapy (CRT). Material and methods All patients with a locally advanced EC who had been treated with upfront CRT, between 2010 and 2015, were included. The decision of surgery was made after CRT (40-50 Gy). Muscle mass was measured on a single third lumbar vertebra CT-scan slice. Sarcopenia was internationally defined as skeletal muscle index of ≤39cm2/m2 for women and ≤55cm2/m2 for men. Resul