The principal autoantigens in Hashimoto's disease are thyroid peroxidase (TPO) and thyroglobulin (Tg), although these antibodies (anti-thyroid peroxidase (anti-TPO) antibody and anti-thyroglobulin (anti-Tg) antibody) are also found in 70% of Graves' disease patients [4]. Here, TPO is linked to Hashimoto thyroiditis.