Fig. 3From: A nomogram for predicting the HER2 status in female patients with breast cancer in China: a nationwide, multicenter, 10-year epidemiological studyValidation of the nomogram. (a) Internal validation using the ROC curve in the training set. The area under the ROC curve (AUC) is 0.636, 95% confidence interval (95% CI, 0.607–0.665). (b) External validation using ROC in the validation set. The AUC is 0.681 (95% CI, 0.631–0.731)Back to article page