The expressions and RE-scores of microRNAs predicted to target Dicer. BL and MA represent the microRNA microarray data published by Blenkiron et al.  and Mattie et al. . HE, MI, MN, VA and WA represent the mRNA microarray data published by Hess et al. , Miller et al. , Minn et al. , van't Veer et al. , and Wang et al. , which were used to calculate the microRNA RE-scores. If the difference between ER+ and ER- samples is significant, the plot is flagged with three asterixes. The expression levels of these six microRNAs are mostly lower in ER- samples; however, almost all the RE-scores in ER- samples are higher, suggesting that the differential regulatory effects of miRNAs can not be explained by miRNA expression difference between ER+ and ER- cancers.