Due to PVT1 expression acting as a diagnostic biomarker of cancer [24, 25], publication bias of test accuracy was checked by a Deek’s funnel plot (Figure 7), which showed that no significant bias existed in tissue (t = 0.39, P = 0.704) and serum (t = −0.47, P = 0.673). This evidence concerns the gene PVT1 and cancer.