In prostate cancer cells, lncRNA Xist, which weakly expresses in normal prostate tissues but not in leukocytes, contributes prostate cancer development (cell proliferation and metastasis) by activating miR-23a/RKIP signaling pathway (Laner et al., 2005; Du Y. et al., 2017). The gene discussed is XIST; the disease is prostate carcinoma.