- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02899598
Genotyping of Human Platelet Alloantigens : Non-invasive Prenatal Diagnosis
Neonatal thrombocytopenia isoimmunization maternal-fetal is related to maternal immunization against fetal platelet antigens with paternal origin not present in the mother. It is considered the equivalent of hemolytic disease of the newborn. The incidence of this disease is about 1 in 800-1000 births. The most severe forms associated petechiae, purpura or cephalhematoma at birth with a major risk of cerebral hemorrhages (20% to 25% of cases) can cause the death of the child (15%) or severe neurological troubles (15-30%) Biologic diagnosis requires the detection of anti-platelet antibodies with maternal determination of platelet phenotypes and genotypes of the two parents.
The objective of this work is to develop specific molecular tools to fetal platelet genotyping from maternal blood. We are particularly interested to antigens HPA-1, HPA-5 , HPA-3 and HPA-4. We evaluate the sensitivity and specificity of this test by comparing these results with those obtained from an invasive sampling of amniotic fluid.
This is a prospective study to assess the technical and diagnostic performance of a new molecular method noninvasive prenatal diagnosis of platelet genotyping.
Study Overview
Status
Intervention / Treatment
Detailed Description
Neonatal thrombocytopenia isoimmunization maternal-fetal is related to maternal immunization against fetal platelet antigens with paternal origin not present in the mother. It is considered the equivalent of hemolytic disease of the newborn. The incidence of this disease is about 1 in 800-1000 births. The most severe forms associated petechiae, purpura or cephalhematoma at birth with a major risk of cerebral hemorrhages (20% to 25% of cases) can cause the death of the child (15%) or severe neurological troubles (15-30%) Biologic diagnosis requires the detection of anti-platelet antibodies with maternal determination of platelet phenotypes and genotypes of the two parents. When it is diagnosed, genetic counseling to the couple for a future pregnancy is necessary because the risk of recurrence is important and severity increases with the number of pregnancies. The risk depends on the nature of paternal antigens, homozygous or heterozygous. In case of heterozygosity, prenatal diagnosis is based on fetal platelet genotyping by an invasive procedure (amniocentesis or chorionic villus sampling) associated with a risk of fetal loss. The alloantibodies responsible for fetal damage are directed against platelet alloantigens: this is HPA system (human platelet alloantigen). 24 alloantigens have been described and 12 of them have a biallelic polymorphism (a: the most frequent allele and b the rare allele) divided into 6 groups (HPA-1, 2, 3, 4, 5, and 15). The genotype-phenotype correlations were performed for 22 of the 24 alloantigens and show that the antigenic polymorphism results from the presence of a SNP (single nucleotide polymorphism-).
In 1997, Lo et al showed the presence of 3-6% of fetal DNA in maternal blood. This discovery led to the development of methods of non-invasive prenatal diagnosis: 1/ the determination of fetal Rhesus 2/ fetal sex by real-time quantitative PCR.
The objective of this work is to develop specific molecular tools to fetal platelet genotyping from maternal blood. We are particularly interested to antigens HPA-1, HPA-5 , HPA-3 and HPA-4. We evaluate the sensitivity and specificity of this test by comparing these results with those obtained from an invasive sampling of amniotic fluid.
This is a prospective study to assess the technical and diagnostic performance of a new molecular method noninvasive prenatal diagnosis of platelet genotyping.
Study Type
Phase
- Not Applicable
Contacts and Locations
Study Locations
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Marseille, France, 13005
- Assistance Publique Hopitaux de Marseille
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- patients with known risk of platelet alloimmunization
- patients for whom suspicion of fetal cerebral hemorrhage has been advanced on ultrasound or fetal MRI signs
Exclusion Criteria:
- Twin pregnancy or triple
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Diagnostic
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Pregnant women
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NEVER STARTED
NEVER STARTED
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
number of Fetomaternal platelet incompatibilities detected
Time Frame: 30 months
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30 months
|
Collaborators and Investigators
Investigators
- Study Director: Urielle DESALBRES, Assistance Publique Hopitaux de Marseille
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimated)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 2012-55 (CCRRC)
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
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