ERBB2 and breast neoplasm: For example, to achieve the same performance with 4 cores in breast tumours from other subtypes (Basal, Luminal A and Luminal B), 6 cores would be needed for the HER2 subtype (HER2 n = 6: cor = 0.92, AUC = 0.96; other subtypes n = 4: cor = 0.92, AUC = 0.96; Table S2).