AFP and hepatocellular carcinoma: Meanwhile, AFP (cut off point: 20 ng/ml) combined with MDM2 methylation in distinguishing the HBV-related HCC patients from LC patients showed a sensitivity of 89.00%, specificity of 58.06%, PPV of 87.25%, and NPV of 62.07%, which were higher than the results of AFP (sensitivity: 52.00%, specificity: 58.06%, PPV: 80.00%, NPV: 27.27%) and MDM2 methylation (sensitivity: 70%, specificity: 64.52%, PPV: 86.42%, NPV: 40.00%).