HOTAIR and gastric cancer: Several lncRNAs, including HOX transcript antisense RNA (HOTAIR) and H19, are involved in cell proliferation, apoptosis, invasion, migration, and metastasis of gastric cancer in the similar manners as oncogenes or tumor suppressor genes (Cui et al., 2015; Hashad et al., 2016; Li et al., 2014; Li, Mo, et al., 2016 Nie et al., 2018; Shao et al., 2016; Sun et al., 2016; Yang et al., 2014).