TUG1 and neoplasm: There was an obvious positive correlation between increased TUG1 levels and deeper tumor invasion depth (6.6585±6.36480 versus 2.5940±2.93578, P=0.017) and advanced TNM stage (8.3053±7.91956 versus 4.3465±3.57530, P=0.001) (Figures 1b and c).