PVT1 and hepatocellular carcinoma: Recent studies suggested that lncRNA FEZF1-AS1 [29], the signaling axis of lncRNA n335586/miR-924/CKMT1A [30], lncAKHE [31], and the signaling axis composed of PVT1/EZH2/miR-214 [32] were involved in the regulation of invasion of HCC via many kinds of signaling pathway.