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Medullary thyroid carcinoma is a rare thyroid cancer that starts in the C-cells, the cells that make the hormone calcitonin.
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In studies in rodents, semaglutide, tirzepatide, liraglutide and dulaglutide caused thyroid C-cell tumors.
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A family history of MTC is one of the few absolute reasons not to take these medicines.
Medullary thyroid carcinoma is a rare thyroid cancer that starts in the C-cells, the cells that make the hormone calcitonin.
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