Validation of the competitive risk model
MPBC
We used a series of validation methods to validate the accuracy and discrimination of the model. The C-index of the model was 0.792 ( 95% CI: 0.763–0.821) in the training set and 0.744 ( 95% CI: 0.691–0.797) in the validation set. The calibration curves in the training and validation sets showed that the model’s predicted values were almost consistent with the actual observed values, which proved that the prediction model had good accuracy (Fig. The calibration curves for predicting the cancer-specific survival of older women with MpBC in the training set (ROC curve with AUC for cancer-specific survival in older women with MpBC. 