Diagnostic value of preoperative examination for evaluating margin status in breast cancer

Figure 3 Validation cohort nomogram prediction model constructed using the predictive factors selected by LASSO regression for predicting negative surgical margins. A: Nomogram receiver operating characteristic (ROC) curve for predicting successful breast conservation in the validation cohort; B: Nomogram ROC curve for predicting failed breast conservation (the model for predicting failed breast conservation was not separated by the training and validation groups due to the small number of cases in the study); C: Internal validation calibration curve in the validation cohort. BCS: Breast-conserving surgery.