Status:
UNKNOWN
Genomic Screening for Hereditary Erythrocytosis and Related Diseases
Lead Sponsor:
Centre Hospitalier Universitaire Dijon
Conditions:
Hereditary Erythrocytosis/Idiopathic Erythrocytosis
Eligibility:
All Genders
Brief Summary
Unexplained polycythemias are rare diseases, and therefore, the collection of data inherent to these diseases will not only improve their characterisation, but also allow stratification according to t...
Eligibility Criteria
Inclusion
- The characteristics of the patients included in the database will be described in terms of numbers and percentages for qualitative variables and in terms of means and standard deviations or medians and interquartile intervals for quantitative variables.
Exclusion
- The first step will be to exclude acquired secondary (pulmonary, renal and cardiac) or acquired primary (polycythemia vera due to JAK2 mutations) causes. The family history and the determination of serum EPO levels are very useful in the decision regarding which molecular tests should be performed first.
- patients without absolute erythrocytosis (i.e. without an increased red cell mass \>125% of mean predicted value, or if the haematocrit is \<60% in males or \<56% in females.
- erythrocytosis related to polycythemia vera according to the 2008 WHO (World Health Organization) criteria
- Secondary erythrocytosis related to an obvious cause (renal lesions, chronic lung or heart diseases, endocrine lesions, miscellaneous tumours producing EPO, drugs such as androgens, hepatic lesions…)
- Low venous blood p50: the determination of p50 (percentage at which Hb is half saturated with oxygen) is very helpful is establishing the presence of a haemoglobin variant with high oxygen affinity or a rare 2,3-diphosphoglycerate (2,3-DPG) deficiency. In such a situation, a specific HBB, HBA1 and HBA2 mutation will be screened for using Sanger sequencing (these genes are not included in NGS analysis because of redundancy of pseudogenes).
- In order to rule out non-informative erythrocytosis cases, a form including mandatory further tests must be filled in for a selection step. The required tests are: complete blood counts
- Blood electrolytes
- Arterial and venous gazes
- Serum erythropoietin dosage
- Liver function tests
- JAK2 mutations (both V617F and exon 12)
- Bone marrow aspirate and/or biopsy and/or endogenous BFU-E culture
- Abdominal ultrasound
- Lung function tests
Key Trial Info
Start Date :
October 1 2016
Trial Type :
OBSERVATIONAL
Allocation :
ESTIMATED
End Date :
October 1 2020
Estimated Enrollment :
150 Patients enrolled
Trial Details
Trial ID
NCT03263364
Start Date
October 1 2016
End Date
October 1 2020
Last Update
August 28 2017
Active Locations (2)
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1
CHU Dijon Bourgogne
Dijon, France, 21079
2
CHU de NANTES
Nantes, France, 44093