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Receiver operating characteristic (ROC) analysis and the determination of cut‐off level of the NX‐DCP ratio for the diagnosis of hepatocellular carcinoma. (a) The area under the ROC curve was 0.8928. (b) The highest Youden index was 0.68 when the cut‐off was fixed as 0.65 and the highest accuracy was 89.5% when the cut‐off was fixed as 1.50.
