Compared to pre-operative examination the post-treatment [18F]FDG-PET/CT demonstrated the disappearance of thyroid lesions and cervical lymph node metastases (i.e., compete surgical resection of local and loco-regional tumor tissues) and unchanged FDG-negative lung metastases, with a corresponding thyroglobulin level at 8.9 μg/L (i.e., incomplete structural response). The gene discussed is TG; the disease is neoplasm.