Fig. 2.

Receiver operator characteristic curves (ROC) of predictive probability (PP) values of the immunodiagnostic model in training set (A), AFP‐negative training set (B), AFP‐positive training set (C), validation set (D), AFP‐negative validation set (E), and AFP‐positive validation set (F). AFP‐negative means the HCC patients with serum AFP concentration lower than 20 ng·mL⁻¹, AFP‐positive indicates that the HCC patients with serum AFP concentration not < 20 ng·mL⁻¹, Se is an abbreviation for “sensitivity”, Sp is the abbreviation of “specificity”, AUC means the area under curve.