ERBB2 and breast cancer: When we next applied the model on 712 breast cancer whole-slide tissue images from the FinHer dataset (external test set), the CNN predicted ERBB2 status with an AUC of 0.67 (95% CI, 0.62–0.71) and an AP of 0.37 (95% CI, 0.32–0.44) with a baseline AP of 0.23 (Fig. 2).