Among the DE miRNAs, the results revealed an upregulation of miR-200a in TNBC, miR-183 in HER2-positive, and miR-21 in luminal B. Moreover, we observed a downregulation of miR-28, miR-3199-1, miR-511-1, and miR-511-2 in luminal B. Several studies identified subtype-specific dysregulated miRNAs in breast cancer. Here, ERBB2 is linked to breast cancer.