HOTAIR and prostate cancer: Several lncRNAs have been used as diagnostic and prognostic markers, including the following: MALAT-1 for liver, lung, breast, and prostate cancer [20–24]; HOTAIR for breast, brain, and colon cancer [25–28]; OOC1 for colon cancer; and PCA3, PCAT-1, and SChLAP1 for prostate cancer [29–31].