PMID- 9735087 OWN - NLM STAT- MEDLINE DCOM- 19980910 LR - 20220409 IS - 0003-4819 (Print) IS - 0003-4819 (Linking) VI - 129 IP - 6 DP - 1998 Sep 15 TI - Multiple endocrine neoplasia type 1: clinical and genetic topics. PG - 484-94 AB - Multiple endocrine neoplasia type 1 (MEN1) consists of benign, and sometimes malignant, tumors (often multiple in a tissue) of the parathyroids, enteropancreatic neuroendocrine system, anterior pituitary, and other tissues. Skin angiofibromas and skin collagenomas are common. Typically, MEN1 tumors begin two decades earlier than sporadic tumors. Because of tumor multiplicity and the tendency for postoperative tumor recurrence, specialized methods have been developed for preoperative and intraoperative localization of many MEN1-associated tumors. The MEN1 gene was recently isolated by positional cloning. This strategy progressively narrows the size of the candidate MEN1 gene interval on the chromosome and then finds and tests many or, if needed, all genes within that interval. The MEN1 gene was finally identified because it was the one gene that contained mutations in most DNAs from a test panel of MEN1 cases. It has been suggested that MEN1, like many hereditary cancer syndromes, is caused by mutation in a tumor suppressor gene that contributes to neoplasia when both gene copies in a tumor precursor cell have been sequentially inactivated ("two-hit" oncogenesis mechanism). Germline MEN1 mutations were found in most families with MEN1 and in most cases of sporadic MEN1. In addition, the MEN1 gene was the gene most likely to show acquired mutation in several sporadic or nonhereditary tumors-parathyroid adenomas, gastrinomas, insulinomas, and bronchial carcinoids. Most germline or acquired MEN1 mutations predicted truncation (and thus likely inactivation) of the encoded protein, supporting expectations for the "first hit" to a tumor suppressor gene. Testing for MEN1 germline mutation is possible in a research setting. Candidates for MEN1 mutation testing include patients with MEN1 or its phenocopies and first-degree relatives of persons with MEN1. FAU - Marx, S AU - Marx S AD - National Institutes of Health, Bethesda, MD 20892, USA. FAU - Spiegel, A M AU - Spiegel AM FAU - Skarulis, M C AU - Skarulis MC FAU - Doppman, J L AU - Doppman JL FAU - Collins, F S AU - Collins FS FAU - Liotta, L A AU - Liotta LA LA - eng PT - Consensus Development Conference PT - Consensus Development Conference, NIH PT - Journal Article PT - Review PL - United States TA - Ann Intern Med JT - Annals of internal medicine JID - 0372351 SB - IM MH - Chromosome Mapping MH - Chromosomes, Human, Pair 11 MH - Genes, Tumor Suppressor/physiology MH - Genetic Linkage MH - Humans MH - Loss of Heterozygosity MH - Multiple Endocrine Neoplasia Type 1/diagnosis/*genetics MH - Mutation MH - Oncogenes/physiology MH - Pedigree RF - 60 EDAT- 1998/09/12 00:00 MHDA- 1998/09/12 00:01 CRDT- 1998/09/12 00:00 PHST- 1998/09/12 00:00 [pubmed] PHST- 1998/09/12 00:01 [medline] PHST- 1998/09/12 00:00 [entrez] AID - 10.7326/0003-4819-129-6-199809150-00011 [doi] PST - ppublish SO - Ann Intern Med. 1998 Sep 15;129(6):484-94. doi: 10.7326/0003-4819-129-6-199809150-00011.