PVT1 and ovarian cancer: As a highly conserved lncRNA, PVT1 has attracted great attention due to its critical and various functions in many cancers, including cervical cancer [17, 30], ovarian cancer [16], hepatocellular carcinoma [14, 31], pancreatic cancer [32], gastric cancer [33, 34], lung cancer [35, 36], and breast cancer [16].