Nine miRNAs were identified, four that displayed increased expression (miR-34b-5p, miR-744-p, miR-485-3p, miR-542-3p) in both Brca1 knockout murine mammary glands and human BRCA1 breast tumours and five were decreased (miR-664-3p, miR-221-3p, miR-16-5p, miR-29b-1-5p and miR-30b-5p) in both datasets (Figure 1B, Supplementary Table 2). This evidence concerns the gene BRCA1 and breast neoplasm.