Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2010-3-5
pubmed:abstractText
Context: Previous studies have shown that double RET mutations may be associated with unusual multiple endocrine neoplasia type 2 (MEN 2) phenotypes. Objective: Our objective was to report the clinical features of patients harboring a previously unreported double mutation of the RET gene and to characterize this mutation in vitro. Patients: Sixteen patients from four unrelated families and harboring the C634Y/Y791F double RET germline mutation were included in the study. Results: Large pheochromocytomas measuring 6.0-14 cm and weighing up to 640 g were identified in the four index cases. Three of the four tumors were bilateral. High penetrance of pheochromocytoma was also seen in the C634Y/Y791F-mutation-positive relatives (seven of nine, 77.7%). Of these, two cases had bilateral tumors, one presented with multifocal tumors, two cases had large tumors (>5 cm), and one case, which was diagnosed with a large (5.5 x 4.5 x 4.0 cm) pheochromocytoma, reported early onset of symptoms of the disease (14 yr old). The overall penetrance of pheochromocytoma was 84.6% (11 of 13). Development of medullary thyroid carcinoma in our patients seemed similar to that observed in patients with codon 634 mutations. Haplotype analysis demonstrated that the mutation did not arise from a common ancestor. In vitro studies showed the double C634Y/Y791F RET receptor was significantly more phosphorylated than either activated wild-type receptor or single C634Y and Y791F RET mutants. Conclusions: Our data suggest that the natural history of the novel C634Y/Y791F double mutation carries a codon 634-like pattern of medullary thyroid carcinoma development, is associated with increased susceptibility to unusually large bilateral pheochromocytomas, and is likely more biologically active than each individual mutation.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
1945-7197
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
95
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1318-27
pubmed:dateRevised
2010-6-2
pubmed:meshHeading
pubmed-meshheading:20080836-Adrenal Gland Neoplasms, pubmed-meshheading:20080836-Adult, pubmed-meshheading:20080836-Blotting, Western, pubmed-meshheading:20080836-Cells, Cultured, pubmed-meshheading:20080836-Female, pubmed-meshheading:20080836-Genetic Association Studies, pubmed-meshheading:20080836-Genetic Predisposition to Disease, pubmed-meshheading:20080836-Genetic Testing, pubmed-meshheading:20080836-Haplotypes, pubmed-meshheading:20080836-Humans, pubmed-meshheading:20080836-Middle Aged, pubmed-meshheading:20080836-Multiple Endocrine Neoplasia Type 2a, pubmed-meshheading:20080836-Mutation, pubmed-meshheading:20080836-Pedigree, pubmed-meshheading:20080836-Penetrance, pubmed-meshheading:20080836-Phenotype, pubmed-meshheading:20080836-Pheochromocytoma, pubmed-meshheading:20080836-Proto-Oncogene Proteins c-ret
pubmed:year
2010
pubmed:articleTitle
High penetrance of pheochromocytoma associated with the novel C634Y/Y791F double germline mutation in the RET protooncogene.
pubmed:affiliation
Faculdade de Medicina da Universidade de São Paulo, Avenida Dr. Arnaldo, 455, 5 degrees andar, Cerqueira César, 012406-903, São Paulo, Brazil. toldo@usp.br
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't