Metastasis was identified in a lymph node, supporting the diagnosis of usual-type metastatic papillary thyroid carcinoma, with positivity for cytokeratin AE1/AE3, thyroglobulin, and thyroid transcription factor 1 (TTF-1), confirming usual-type metastatic papillary carcinoma. The gene discussed is TTF1; the disease is differentiated thyroid carcinoma.