TTF-1 (stands for thyroid transcription factor -1) is a protein made by cells normally found in the thyroid gland, lungs, thymus, and brain. Most benign (noncancerous) and malignant (cancerous) tumours that start from cells in these organs also make this protein. Normal neuroendocrine cells and tumours made up of neuroendocrine cells can also make TTF-1. …
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