The expression levels of downregulated miRNAs in breast cancer tissues and the pair-matched non-cancerous tissues. The miRNAs downregulated in breast cancer tissues were (a) miR-10, (b) miR-28, (c) miR-99a, (d) miR-100, (e) miR-125b-1, (f) miR-125b-2, (g) miR-139, (h) miR-143, (i) miR-145, (j) miR-195, (k) miR-218-1, (l) miR-337, (m) miR-497, (n) miR-511-1, (o) miR-511-2, (p) miR-676, (q) miR-3199-1, (r) miR-3199-2, and (s) let-7c. The means of the miRNA expression levels in the breast cancer tissues are significantly lower than that in pair-matched non-cancerous breast tissues. Data are reported as mean ± SD. * p < 0.05, ** p < 0.01, *** p < 0.001.