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Medullary thyroid cancer (MTC) is an infrequent neuroendocrine tumor, which amounts to 3-5% of all thyroid malignancies. Approximately 75-80% of MTCs are sporadic neoplasms. The rest of 20-25% are familial cases that belong to multiple endocrine neoplasia (MEN) syndromes, specifically MEN2 and MEN3. These cases of familial MTC are attributed to an activating germline mutation of a tyrosine kinase receptor gene, the rearranged during transfection (RET) proto-oncogene, located on chromosome 10q11.21. These mutations are also found in som