PVT1 and gastric cancer: In present studies, the results of meta-analysis showed that higher expression level of lncRNA PVT1 was associated with GC patients' gender (for male: OR = 2.27, 95% CI: 1.67~3.07, P = 0.000), invasion depth (for T3~4: OR = 3.98, 95% CI: 2.85~5.56, P = 0.000), poorer OS (HR = 1.68, 95% CI: 1.43~1.97, P = 0.000), and DFS (HR = 1.74, 95% CI: 1.44~2.08, P = 0.000).