Multiple endocrine neoplasia type 2 (MEN2) is a rare genetic condition that leads to the development of cancers as well as benign tumors of the endocrine system. It includes three clinical subtypes: MEN2A (90% of MEN2 families), MEN2B (5%) and familial medullary thyroid carcinoma (FMTC). MEN2 is due to mutations in the RET gene.
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