- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01650142
Modifying Genes in Neurofibromatosis 1 (NFGENMODIF)
Study of the Neurofibromatosis 1 Expression: Identification of the Modifying Genes
Study Overview
Detailed Description
Neurofibromatosis 1(NF1) is a rare autosomal dominant disorder with an incidence of one birth out of 3000. NF1 gene is located in 17q11.2. The penetrance is near 100% by the age of 8 and the de novo mutations represent half the cases. The product of NF1 gene is neurofibromin, a protein controlling cellular differentiation and proliferation. Phenotypic expression is variable even in the same family. Neurofibromatosis 1 is characterized by café au lait spots, freckling of the folds, Lisch'nodules (hamartomas of iris) and multiple neurofibromas. Manifestations of neurofibromatosis 1 are pleiotropic, potentially severe and unpredictable. Morbidity and mortality associated to neurofibromatosis 1 are linked with complications, optic pathway gliomas, neurofibromas of the spine or of peripheral nerves, learning disabilities, scoliosis and bone abnormalities and vasculopathy. The investigators already demonstrated the existence of modifiers, genes modifying the phenotypic expression of neurofibromatosis 1 (Hum Mol Genet. 2009;18(15):2768-78). Indeed, a quantitative analysis of inter and intrafamilial variability performed with the data of the investigators phenotype/genotype database showed a strong genetic component for most studied clinical traits with an estimated heritability from 44 and 45% for subcutaneous and plexiform neurofibromas, to 66% for small café au lait spots. The investigators also showed that the NF1 gene had minor effect in the phenotypic variability. The investigators results suggested the implication of genes non linked to NF1 gene. The identification of these variants called modifiers of the phenotype is possible thanks to the investigators vast collection of patients and its statistical power. The aim of the present study is to identify in the human genome genetic variants in the evolving pattern of the most frequent manifestation of neurofibromatosis 1, neurofibromas. The genetic association studies are the most adapted in that purpose. The investigators bank includes at the present time 1099 patients of 575 families with genotypes, phenotypes and DNA samples.
The investigators will include 450 index cases more to have around 1000 independent patients with neurofibromatosis 1 to get a 90% statistical power to detect variants of 30% frequency in the general population and having an effect of odds ratio of 2 for studied trait. The investigators will use Affymetrix® Genechips 6.0 covering well the whole genome.
Identification of the variants will provide new comprehension of pathophysiology and new targets for treatment.
Study Type
Enrollment (Anticipated)
Contacts and Locations
Study Locations
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Creteil, France, 94010
- Henri Mondor Hospital
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria:
- Aged of 18 or more
- Patient with neurofibromatosis 1 according the NIH criteria :
- Six or more café au lait macules over 15 mm in greatest diameter in postpubertal individuals
- Two or more neurofibromas of any type or one plexiform neurofibroma
- Freckling in the axillary or inguinal regions (Crowe´s sign)
- Optic glioma
- Two or more Lisch nodules (iris hamartomas)
- A distinctive osseous lesion such as sphenoid dysplasia or thinning of long bone cortex with or without pseudoarthrosis
- A first-degree relative (parent, sibling, or offspring) with NF1 by the above criteria
- The criteria are met in an individual if two or more of the features listed are present.
Exclusion Criteria:
- Children (< 18 year-old)
- One member of the family already included in the study
Study Plan
How is the study designed?
Design Details
Cohorts and Interventions
Group / Cohort |
Intervention / Treatment |
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NF1GeneModif Cohort
Adult patients with neurofibromatosis 1
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No intervention
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
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Identification of the genetic variants involved in variability of clinical expression of neurofibromatosis 1.
Time Frame: 3 years
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3 years
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Collaborators and Investigators
Collaborators
Publications and helpful links
General Publications
- Easton DF, Ponder MA, Huson SM, Ponder BA. An analysis of variation in expression of neurofibromatosis (NF) type 1 (NF1): evidence for modifying genes. Am J Hum Genet. 1993 Aug;53(2):305-13.
- Gutmann DH, Aylsworth A, Carey JC, Korf B, Marks J, Pyeritz RE, Rubenstein A, Viskochil D. The diagnostic evaluation and multidisciplinary management of neurofibromatosis 1 and neurofibromatosis 2. JAMA. 1997 Jul 2;278(1):51-7.
- Sabbagh A, Pasmant E, Laurendeau I, Parfait B, Barbarot S, Guillot B, Combemale P, Ferkal S, Vidaud M, Aubourg P, Vidaud D, Wolkenstein P; members of the NF France Network. Unravelling the genetic basis of variable clinical expression in neurofibromatosis 1. Hum Mol Genet. 2009 Aug 1;18(15):2768-78. doi: 10.1093/hmg/ddp212. Epub 2009 May 5.
Study record dates
Study Major Dates
Study Start
Primary Completion (ANTICIPATED)
Study Completion (ANTICIPATED)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (ESTIMATE)
Study Record Updates
Last Update Posted (ESTIMATE)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
- Nervous System Diseases
- Neoplasms by Histologic Type
- Neoplasms
- Genetic Diseases, Inborn
- Neuromuscular Diseases
- Neurodegenerative Diseases
- Neoplasms, Nerve Tissue
- Peripheral Nervous System Diseases
- Nervous System Neoplasms
- Heredodegenerative Disorders, Nervous System
- Neoplastic Syndromes, Hereditary
- Nerve Sheath Neoplasms
- Neurocutaneous Syndromes
- Peripheral Nervous System Neoplasms
- Neurofibromatoses
- Neurofibromatosis 1
- Neurofibroma
Other Study ID Numbers
- AOM 10 005
- 2010-023137-34 (EUDRACT_NUMBER)
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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