Glutathione peroxidase family showed variable gene expression: GPX1 and GPX2 expression analysis suggested minor increase in mRNA synthesis (Fig. 1j, k), GPX3, GPX5, and GPX7 expression was downregulated in thyroid cancers (Fig. 1l, n, o), whereas GPX4 expression did not change (Fig. 1m). This evidence concerns the gene GPX1 and thyroid cancer.