Fig. 2

Receiver operating characteristic curves (A, in the training cohort, and B, in the validation cohort) and calibration plots (C, in the training cohort, and D, in the validation cohort) of the model for the prediction of microvascular invasion in HBV-related intrahepatic cholangiocarcinoma. The calibration plot compares the predicted and actual outcomes. The dashed line is a reference line, indicating where an ideal nomogram would be. The solid line indicates the 40-sample bootstrapped performance of the nomogram. The calibration plots lay close to the dashed lines when plotting the predicted probabilities against the actual probabilities, demonstrating that the calibration plots of the nomogram fitted well in both two cohorts. AUC, Area under the curve; CI, Confidence interval