Development of a diagnostic nomogram for alpha-fetoprotein-negative hepatocellular carcinoma based on serological biomarkers

Figure 4 Receiver operating characteristic curves and calibration curves of several models. A: The receiver operating characteristic (ROC) curves for Model 1 and Model 2; B: The ROC curves for Model 1 and Model 3; C: The ROC curves for Model 1 and CK18-M65; D: Calibration curves based on Model 1 and the actual observation; E: Calibration curves based on Model 2 and the actual observation; F: Calibration curves based on Model 3 and the actual observation. AUC: Area under the curve.