Interestingly, we found that Robo3s expression was not restricted to the WAP-T mouse model, as the murine MMTV-Myc mammary carcinomas also showed specific expression of Robo3s together with a similar epigenetic profile at its gene locus and a promoter region-specific H3K4me3 peak in the proximity of exon 17 (Fig. S1E). This evidence concerns the gene MYC and breast carcinoma.