For example, Feng et al. revealed that KCNQ1OT1 inhibited stomach cancer cell progression via regulating miR-9 and LMX1A expression (Feng et al., 2020); Wu et al. found the high expression of lncRNA-CCAT2 indicated poor prognosis of stomach cancer and promoted cell proliferation and invasion (Wu et al., 2017). This evidence concerns the gene KCNQ1OT1 and gastric cancer.