CASC15 and osteosarcoma: Moreover, CASC15 is a novel tumor-related lncRNA, the abnormal expression of which has been reported in a variety of tumors, demonstrating that CASC15 is up-regulated in plasma exosomes of patients with osteosarcoma, while CASC15 knockdown can inhibit the progression of osteosarcoma by targeting the miR-338-3p/RAB14 axis.