AR and prostate cancer: miR-30 was also downregulated in prostate cancer cells compared to that in the prostate immortalized normal epithelial-derived cell line RWPE-1, which may be associated with tumor suppressor functions in prostate cancer (Kao et al., 2014), and miR-30 has been identified as a direct regulator of androgen receptor signaling in prostate cancer by complementary functional microRNA library screening (Kumar et al., 2016).