Multiple Endocrine Neoplasia Type 1 (MEN1) is a rare hereditary cancer syndrome associated with tumors in organs that control hormones such as

• Pituitary tumors
• Adrenal cortical tumors
• Tumors of the Islet cells of the pancreas
• Parathyroid tumors
• Carcinoid tumors and malignant Schwannoma (nerve cell tumors) are sometimes seen

Multiple Endocrine Neoplasia Type 2 (MEN2) is a rare hereditary cancer syndrome that involves

• Medullary thyroid cancer (MTC), a key feature of this syndrome
• Parathyroid cancer
• Pheochromocytomas, a tumor of the adrenal gland
• Mucosal neuromas, or "bumps" on tongue, lips, mouth