Natural History of Hypereosinophilia and Hypereosinophilic Syndromes

Study Overview
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Brief Summary
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Unexplained chronic hypereosinophilia (HE) and hypereosinophilic syndromes (HES) are heterogeneous regarding the organ involvements (heart, lungs, skin, .. or none), the evolutionary profiles, the response to treatments. Underlying mechanisms are largely unknown and may associate genetic predisposing factors (germinal ? somatic?), environmental factors (alimentation, tobacco use, hormones, infections, ..) The COHESion study aims to study all clinical and biological characteristics of HE/HES patients and their evolutionary profiles, with a focus on genetic factors and the mechanisms supporting transitory or persistant chronic HE/HES (in absence of any well identified extrinsic trigger like drugs, parasitosis, ..)

Detailed Description
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There is currently no data on the natural history of unexplained chronic hypereosinophilia (HE) and hypereosinophilic syndromes (HES). Clinical practice shows that HE/SHE patients can present 4 evolutionary profiles: A. a single flare-up of their disease, with favourable evolution spontaneously or under corticosteroid therapy, without further recurrence B. recurrent flare-ups with a variable free interval of several months to several years, with or without persistent eosinophilia between flare-ups C. a chronic disease requiring the continuation of a substantive treatment D. chronic asymptomatic HE for years: the mechanisms involved in the occurrence of possible organ damage are unknown The primary objective of the study is to describe the frequency of the different clinical manifestations during the diagnostic and follow-up of the hypereosinophilic syndrome (HES). The primary endpoint is the frequency of the different clinical manifestations and/or organs damage related to eosinophilia.

Official Title
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Study of Clinical Profiles of Patients Followed for Chronic Hypereosinophilia and/or Hypereosinophilic Syndrome by the Creation of a National Cohort

Conditions
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Eosinophilia, Hypereosinophilic Syndrome

Intervention / Treatment
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* Biological: Biological sample


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Men or Women of any age : With the diagnosis criteria of hyperosinophlia OR hypereosinophilic syndrome OR specific organ eosinophilic disease according to the consensus conference of the International Cooperative Working Group on Eosinophil Disorders (ICOG-EO) With an AEC > 1500/mm3 or organ damage related to the presence of eosinophils in the tissues or organs whatever the context (idiopathic, clonal or reactive, including drug-related, parasitic or allergic) HES diagnosis since 2005/01/01 Patients socially insured Patient who agreed to participate to the study, its proceedings and duration. Exclusion Criteria: Known HIV infection Not socially insured Person unable to receive a enlighten information Person who refuse to sign the consent Persons deprived of their liberty Persons benefiting from a system of legal protection (tutelage / guardianship)
Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Eosinophilia/Hypereosinophilic syndrome<br>patient with eosinophilia and/or hypereosinophilic syndrome | Biological: Biological sample<br>* Additional blood samples for biobanking<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Frequency of the different clinical manifestations at time of diagnosis and during follow-up of the hypereosinophilic syndrome (HES) | The primary objective of the study is to describe the frequency of the different clinical manifestations at diagnosis and during follow-up of the hypereosinophilic syndrome (HES/HE). The primary endpoint is the frequency of the different clinical manifestations and/or organs damage related to hypereosinophilia. | 10 years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Frequency of the evolutionary profiles | Frequency of the different evolutionary profiles. | 10 years | 
| Frequency of complications depending of the type of HES | Frequency of complications (organ damages) depending on the type of HES (idiopathic, reactive, clonal…). | 10 years | 
| Frequency of organ damage profiles before and after 18 years old. | Describe the characteristics of pediatrics HE/HES vs adult HE/HES. | 10 years | 
| Frequency of clinical complications profiles before and after 18 years old. | Clinical characteristics of pediatrics HE/HES vs adult HE/HES. | 10 years | 
| Frequency of HLA alleles and variants / mutations on other genes of HE/HES | Predisposing factors in HE/HES by various genomic approaches | 10 years | 
| Serum biomarkers | to explore Potential predisposing factors in HE/HES: serum markers predictive of interest in eosinophilopoiesis (IL5), tissue homing (eotaxins, etc.) | 10 years | 
| Difference in Membrane activation markers of HE patients (asymptomatic) versus SHE (symptomatic). | Predisposing factors in HE/HES by various genomic approaches | 10 years | 
| Difference in Eosinophilic gene expression profiles of HE patients (asymptomatic) versus SHE (symptomatic). | Predisposing factors in HE/HES by various genomic approaches | 10 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Eosinophilia, Hypereosinophilia, Hypereosinophilic Syndrome