PTTG3P and non-small cell lung carcinoma: To determine the effect of lncRNA PTTG3P knockdown on metastasis of NSCLC cells from blood to lung, we injected A549 cells stably transfected with LV-shPTTG3P or LV-shCTR into immunodeficient mice through the tail vein, and established a tumor cell model of blood-lung metastasis.