Sox9 signaling showed to be essential in the EMT mechanism in non-small-cell lung carcinoma cell (Zhang et al., 2017; Huang et al., 2019), mouse embryonic mammary cells (Kogata et al., 2018), mouse gastric cancer cells (Li et al., 2018), human colorectal cancer cells (Choi et al., 2017), human hepatocellular carcinoma cells (Kawai et al., 2016), thyroid cancer cells (Huang and Guo, 2017), and avian neural crest cells (Sakai et al., 2006) in vitro. The gene discussed is SOX9; the disease is thyroid gland carcinoma.