XIST and gastric cancer: For instance, the perturbation of lncRNA XIST expression related to metastasis and recurrence in a variety of cancers, including bladder cancer [4], nasopharyngeal carcinoma (NPC) [5], pancreatic cancer (PC) [6], colorectal cancer (CRC) [7–9], glioma [10, 11], prostate cancer (PCa) [12], ovarian cancer, gastric cancer (GC) [13, 14], hepatocellular carcinoma (HCC) [15, 16], and non-small cell lung cancer (NSCLC) [17, 18].