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Kaplan-Meier survival analysis in patients with metastatic/recurrent ESCC. Disease-free survival and overall survival curves for metastatic/recurrent ESCC patients with low and high expression levels of MIF in tumor cells (a and b). Disease-free survival and overall survival curves for metastatic/recurrent ESCC patients with low and high expression levels of CXCR4 in tumor cells (c and d).
