TPO and thromboangiitis obliterans: Considering the dysfunction of the thyroid gland associated to TAO, the traditional circulating thyroid hormones (TSH, triiodothyronine also known as T3, and thyroxine, called T4) used for diagnosing thyroid dysfunction or the antibodies against TSH-R (TSH-R-Abs) [22, 46] or thyroid peroxidase- (TPO-) Abs [47, 48] would be naively expected to be highly studied and give an interesting insight on the clinical status of the TAO patients.