For instance, lncRNAs CCAT1 (Deng et al., 2015), XIST (Chen et al., 2016) and LINC00152 (Cai et al., 2017) were reported to promote cancer progression by functioning as miRNA sponges in hepatocellular carcinoma, gastric cancer and gallbladder cancer. This evidence concerns the gene XIST and gastric cancer.