miR-26 was downregulated in breast cancer and inversely correlated with CHD1 and KPNA2 levels. (a, b) Relative expression levels of miR-26 in human breast specimens. MicroRNA (miRNA) levels were measured by TaqMan stem-loop quantitative real-time polymerase chain reaction. U6 was used as an internal control. (c, d) Relative expression levels of CHD1 and KPNA2 mRNA in breast clinical specimens. CHD1 and KPNA2 abundance was normalized to glyceraldehyde 3-phosphate dehydrogenase. (e, f, g, h) A statistically inverse correlation between miR-26 and CHD1 and KPNA2 mRNA levels in human breast specimens (Spearman’s correlation analysis).