PVT1 and liver cancer: Many studies have found that a variety of long non-coding RNAs (LncRNAs), such as LncRNA plasmacytoma variant translocation 1 (PVT1), LncRNA pituitary tumor-transforming 3, pseudogene (PTTG3P) and LncRNA n335586, can promote the proliferation, migration, invasion and cancer stem cell-like properties in liver cancer [9–11].