However, the expression of GPx1 has been reported to be down-regulated in thyroid cancer [44], colorectal cancer [45, 46], and gastric cancer [47], whereas GPx1 has been demonstrated to play an oncogenic role in kidney cancer [48], pancreatic cancer [49], and laryngeal squamous cell carcinoma [50]. This evidence concerns the gene GPX1 and thyroid gland carcinoma.