CASC15 and tongue squamous cell carcinoma: Recently, a novel oncogenic lncRNA, CASC15, is identified in various cancers such as basal cell 13, hepatic 14, 15 and tongue squamous cell carcinoma 16, as well as cervical 17, breast 18, melanoma 19-21, gastric 22, 23, colon 24, lung 25 and ovarian 26 cancer.