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Prostate cancer remains the second most common type of cancer and frequent cause of cancer-related mortality in American men. Even though many patients with metastatic prostate cancer will initially respond to androgen deprivation therapy, virtually all patients will relapse and develop lethal castration-resistant prostate cancer. Long noncoding RNAs (lncRNAs) are emerging as critical regulatory elements of many cellular biological processes, and there is increasing evidence demonstrating that dysregulation of lncRNAs is associated with many human cancers, including cancers of the prostate, breast, and lung. We have discovered in a high-throughput RNAi screen identifying regulators of prostate cancer cell growth that knockdown of lymphocyte-specific protein tyrosine kinase (LCK) significantly decreases growth of prostate cancer cells in the presence and absence of androgen. Surprisingly …