PCAT1 and lung cancer: Previous studies have shown that lncRNA-PCAT1 plays key roles in multiple cancers, including lung cancer, by distinct mechanisms (Prensner et al., 2014; Zhao et al., 2015; Wen et al., 2016; Bi et al., 2017; Qiao et al., 2017, 2018; Ren et al., 2017; Xu et al., 2017; Zhang et al., 2017a, 2017b; Huang et al., 2018; Li et al., 2018).