A number of studies have proposed a correlation between miRNAs and AR in PC (Shi et al., 2007; Epis et al., 2009; Ribas et al., 2009; Cao et al., 2010; Nadiminty et al., 2012), but there are still few evidences about the possible role of miRNAs in regulating AR expression in BC. This evidence concerns the gene AR and breast cancer.