PVT1 and hepatocellular carcinoma: lncRNA PVT1 and uc002mbe.2 showed significantly upregulated expression levels in HCCs, and the combination of PVT1 and uc002mbe.2 was considered a possible HCC marker, with an area under the ROC curve of 0.764 and sensitivity and specificity of 60.56% and 90.62%, respectively.