In previous studies, elevated Plk1 expression levels were correlated with invasion in several tumor types, such as colon carcinoma, bladder cancer, thyroid cancer, and lung cancer (Han et al., 2012; Li et al., 2017; Rizki et al., 2007; Wu et al., 2016; Zhang et al., 2013). This evidence concerns the gene PLK1 and thyroid gland carcinoma.