Notably, while NCAPH transgenic mice developed distinct histopathological types of breast cancer (Figure 1J–M), the MMTV‐NCAPHErBb2 double‐transgenic mice developed only infiltrating ductal adenocarcinomas, suggesting that the ErbB2 oncogene exerts a dominant effect on the tumour phenotype. The gene discussed is ERBB2; the disease is breast carcinoma.