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What does TTF stand for?

TTF stands for Thyroid Transcription Factor

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The neoplastic cells will be strongly and diffusely immunoreactive with calcitonin (figure 3), chromogranin, synaptophysin, mCEA, keratin, and thyroid transcription factor 1; the cells are nonreactive with thyroglobulin.
In a minority of these patients, the congenital hypothyroidism is associated with mutations in genes responsible for the development or growth of thyroid follicular cells: thyroid transcription factor 1 (TTF-1; also known as TITF1, NKX2-1, or T/EBP) (3,4), thyroid transcription factor 2 (TTF-2; also known as TITF2, FOXE1, or FKHL15) (5), paired box transcription factor 8 (PAX-8) (6-9), thyrotropin [(TSH).
We further investigated the roles of proliferation of epithelium and a possible stromal stem cell in induction of pulmonary PT by immunostaining for proliferating index (Ki-67) and thyroid transcription factor 1 (TTF-1) (11) and c-Kit antigen (a stem cell factor receptor/mast cell growth factor receptor).
Pathologic Diagnosis: Metastatic Cystic Papillary Carcinoma of Thyroid in a Lymph Node Immunohistochemistry studies showed the epithelial cells were positive for thyroid transcription factor 1 and thyroglobulin.