PTTG3P and neoplasm: To determine the effect of lncRNA PTTG3P knockdown on tumorigenesis of NSCLC cells in vivo, xenograft tumor model was generated by subcutaneously injecting A549 cells stably transfected with LV-shPTTG3P or control vector (LV-shCTR) to male nude mice (n=6); the tumor size was measured once every 3 days to 21 days, and the xenograft tumors were harvested and weighed.