TG and neoplasm: The American Thyroid Association (ATA) recommends TSH suppression for high risk patients; according to their definition those patients with an extensive extrathyroidal growth, distant metastases, an incomplete tumor resection, a very high postoperative human thyroglobulin (hTg), an N1-situation with metastases > 3 cm, or a follicular carcinoma with extensive vascular invasion (>4 foci) [8].