KCNQ1OT1 and prostate cancer: This included already well-known lncRNAs, such as KCNQ1OT1, H19, and prostate cancer-associated transcript 1 (PCAT1). LncRNA KCNQ1OT1 was known to act as an miRNA sponge and compete with either miR-211-5p or miR-15 to promote prostate cancer progression [40,41].