Consistent with studies that identified upregulation of miR-206 in ER- breast tumors, miR-206 levels were elevated in TNBCs compared with both ER+ and HER2+ human subgroups (Figure 1a, right panel).44, 45 Enrichment of miR-206 was similarly observed in murine basal-like mammary tumors (Figure 1b). Here, ERBB2 is linked to breast cancer.