AbstractMultiple endocrine neoplasia‐1 (MEN‐1) is an autosomal dominant inherited syndrome that occurs due to inactivating mutations of the MEN1 gene locus, coding for a tumor‐suppressor protein, menin. The components of MEN‐1 are hyperparathyroidism due to multiple parathyroid adenomas, pancreatic neuroendocrine tumors, and pituitary adenomas, in addition to some less common neoplastic manifestations. Care of people with MEN‐1 requires knowledge of the problems that may arise, and the best approaches to detect and care for the manifestations of this incurable, but manageable, disease. J. Surg. Oncol. 2005;89:143–150. © 2005 Wiley‐Liss, Inc.