title: Acromegaly in a multiple endocrine neoplasia type 1 (MEN1) family with low penetrance of the disease.
abstract: Multiple endocrine neoplasia type 1 (MEN1) is an inherited syndrome that is characterised by the occurrence of tumours in the parathyroid glands, the endocrine pancreas, the pituitary gland and the adrenal glands and by neuroendocrine carcinoid tumours, often at a young age. The penetrance of MEN1 among gene carriers is reported to be high; 82-99% at age 50. We present a patient with a history of parathyroid adenomas also showing signs of acromegaly. He turned out to be a carrier of a MEN1 germ-line mutation in intron 3 (IVS3-6C > G). This germ-line mutation was also found in nine of his family members. However, none of these relatives have developed any MEN1-related lesion yet, although several are older than 60 years. To our knowledge, a MEN1 family with as few clinical features as this family has not been reported to date. Because MEN1 patients have an increased risk of developing acromegaly, insulin-like growth factor (IGF-I) levels are monitored periodically. We investigated whether IGF-I levels might serve as a presymptomatic marker for acromegaly; 9% (3/33) of MEN1 patients showed temporary IGF-I elevations. One patient (1/3) later developed clinical signs of acromegaly. Possibly, acromegaly in MEN1 is preceded by a transient preacromegalic state.
authors.affiliation: Department of Endocrinology, University Medical Centre Utrecht, PO Box 85.500, 3508 GA, Utrecht, The Netherlands.
authors.forename: Koen M A
authors.initials: KM
authors.lastname: Dreijerink
authors.forename: André P
authors.initials: AP
authors.lastname: van Beek
authors.forename: Eef G W M
authors.initials: EG
authors.lastname: Lentjes
authors.forename: Jan G
authors.initials: JG
authors.lastname: Post
authors.forename: Rob B
authors.initials: RB
authors.lastname: van der Luijt
authors.forename: Marijke R
authors.initials: MR
authors.lastname: Canninga-van Dijk
authors.forename: Cornelis J M
authors.initials: CJ
authors.lastname: Lips
mesh_terms: D000172:Acromegaly / Q000097:blood / Q000209:etiology* / Q000628:therapy; D000236:Adenoma / Q000235:genetics; D004252:DNA Mutational Analysis; D018095:Germ-Line Mutation; D049912:Growth Hormone-Secreting Pituitary Adenoma / Q000235:genetics; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000032:analysis; D008297:Male; D008875:Middle Aged; D018761:Multiple Endocrine Neoplasia Type 1 / Q000097:blood / Q000175:diagnosis* / Q000235:genetics*; D010282:Parathyroid Neoplasms / Q000235:genetics; D010375:Pedigree; D019683:Penetrance
chemical_list: D007334:Insulin-Like Growth Factor I