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The ROC curves for the relative risk model in discriminating ESCC patients from healthy controls. (A) ROC curve without cross-validation (B) ROC curve with 10-fold cross-validation (C) ROC curve with leave-one-out cross-validation, The optimal cut-off points (dots) were marked on the ROC curves. ESCC, esophageal squamous cell carcinoma. ROC, receiver-operating characteristic curve.
