title: Gastric cancer in three relatives of a patient with a biallelic IL12RB1 mutation.
abstract: IL-12Rβ1 deficiency, also known as immunodeficiency 30 (IMD30, OMIM 614891), is a rare immunodeficiency syndrome caused by biallelic mutations in IL12RB1. Three second-degree relatives of a patient with this syndrome, all women, developed intestinal-type gastric cancer (GC). In the Netherlands the incidence of non-cardia GC in women is only 7 per 100,000 person years. Both relatives that were available for testing proved to be heterozygous for the familial IL12RB1 mutation, suggesting there might be a causal relation. Testing 29 index patients from families with early onset and/or a familial history of GC for germline mutations in both IL12RB1 and IL12RB2, that encodes the binding partner of IL-12Rβ1, did not reveal other germline mutations in these genes. Therefore heterozygous inactivating mutations in IL12RB1 and IL12RB2 are unlikely to be frequently involved in GC predisposition. Additional research in families with IL12RB1 mutations is required to determine whether carriers of IL12RB1 mutations have an increased (gastric) cancer risk.
authors.affiliation: Department of Human Genetics, Radboud university medical center, Geert Grooteplein Zuid 10, 6525 GA, Nijmegen, The Netherlands, ingrid.vogelaar@radboudumc.nl.
authors.forename: Ingrid P
authors.initials: IP
authors.lastname: Vogelaar
authors.forename: Rachel S
authors.initials: RS
authors.lastname: van der Post
authors.forename: Esther
authors.initials: E
authors.lastname: van de Vosse
authors.forename: J Han J M
authors.initials: JH
authors.lastname: van Krieken
authors.forename: Nicoline
authors.initials: N
authors.lastname: Hoogerbrugge
authors.forename: Marjolijn J L
authors.initials: MJ
authors.lastname: Ligtenberg
authors.forename: Encarna
authors.initials: E
authors.lastname: Gómez García
mesh_terms: D000368:Aged; D000483:Alleles; D004252:DNA Mutational Analysis; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D018095:Germ-Line Mutation; D006801:Humans; D007153:Immunologic Deficiency Syndromes / Q000235:genetics; D009154:Mutation; D009426:Netherlands; D010375:Pedigree; D053707:Receptors, Interleukin-12 / Q000172:deficiency / Q000235:genetics*; D013274:Stomach Neoplasms / Q000235:genetics*
chemical_list: C508438:IL12RB1 protein, human; D053707:Receptors, Interleukin-12