F1 hybrid mice from CC001, CC007, CC013, and CC042 strains developed significantly more tumours, while F1 hybrid mice from CC038, CC080, CC051, and CC012 strains developed significantly less tumours than FVB/N MMTV-Erbb2 mice (Fig. 1b; Supplementary Table S1). Here, ERBB2 is linked to neoplasm.