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OS rate of MEC and FEC patients at different metastasis sites. (A) OS of bone alone metastasis between MEC and FEC patients; (B) OS of liver alone metastasis between MEC and FEC patients; (C) OS of lung alone metastasis between MEC and FEC patients; and (D) OS of both liver and lung metastasis between MEC and FEC patients. FEC = female esophageal cancer, MEC = male esophageal cancer, OS = overall survival.
