We must emphasize that some patients having DTC and also Hashimoto's thyroiditis may had previously received Se supplements or Brazil nuts for a long period of time before DTC was diagnosed and thyroidectomy had followed.
<b>Methods:</b> The SNP's <i>FOXO3a</i> rs4946936/rs4945816/rs9400239 were genotyped in 257 patients with differentiated thyroid carcinoma (DTC), 139 patients with Hashimoto thyroiditis (HT) and 463 healthy controls (HC).