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a Overall 5-year survival curves of patients with esophageal cancer according to the expression of BMP7. Patients who were positive for BMP7 expression exhibited significantly poorer prognosis than those negative for BMP7 expression. b Overall 5-year survival curves of patients without lymph node metastasis in relation to BMP7 expression. Patients who were positive for BMP7 expression exhibited significantly poorer prognosis than those negative for BMP7 expression
