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Multiple endocrine neoplasia caused by inactivating mutation(s) of the tumor suppressor gene MEN1, encoding the menin protein, a component of the histone methyltransferase complex. The condition is characterized by hyperfunctioning adenomas of the parathyroid glands, adrenal glands, pituitary gland, and pancreatic endocrine cells (most commonly gastrinomas and insulinomas); thymic and bronchial carcinoid tumors also may develop.
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