We tested let-7c, with roles in Myc regulation (reviewed in [45]) and in HMEC progenitor cells [51]; miR-99a, which clusters with let-7c, and resides in a commonly deleted chromosome region of lung [52] and primary breast cancer [53]; miR-196a1, which is overexpressed in breast cancer cells [54], miR-210, a hypoxia sensor with prognostic value in breast cancer [1], [54], [55]; miR-200b, a regulator of epithelial-mesenchymal transition (EMT), [41], [56], [57]; and several miRNAs associated with metastasis, miR-148a [58], miR-335[5], miR-373 and miR-520c [3]). This evidence concerns the gene MYC and breast cancer.