PTH2 and lung cancer: Other genes, such as PTH2 (Kim et al., 1998), TBR2 (Kaowinn et al., 2017), WNT7B (Kirikoshi and Katoh, 2002), and CER1 (Semenova et al., 2016), either have similar effects shared with their homologues or have been independently reported to be associated with lung cancer at different omics levels.