Children and Adult Hemophagocytic Syndrome (HLHa)

Study Overview
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Brief Summary
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Different study of HLHa patients : Diagnosis criteria, because criteria are based on pediatric genetic studies. Physiopathological studies: genetic studies have demonstrated the role of CD8+ cells, in particular because they have a genetic defect affecting their cytotoxic functions in HLH pediatric. the aim is to establish if the same defect is found in both some or in all of HLHa patients. If this is the case, to then establish whether hypomorphic genetic mutations are responsible.

Detailed Description
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Formation of a prospective and retrospective infant, adolescent and adult HLH patients cohort. Collection of clinical and biological, therapeutics, informations, in a register, The collection of information is: To identify clinical and biological criteria specific to HLHa Classify patients into homogeneous groups, based on clinical biological scalability in particular, with regards to their response to treatment Identify and analyze the behavioral therapy Creation of a bank of biological samples for use in the study of the pathophysiology of HLHa. Background: The hemophagocytic syndrome in infant, adolescent and adults (HLH) is a serious and often lethal condition. The study of literature series HLHa shows that these syndromes frequently develop in immunocompromised patients (renal transplant, HIV, collagen in Processing immunosuppressants) in the course of a viral infection. HLH syndrome has also been described as a clinical form of lymphoma or connective disease (lupus). These clinical forms are rare, severe and recurrent suggesting the possibility that immune deficiency could be involved. The study of pediatric forms has definitely established a link between HLH syndrome and the presence of immune deficiency by identifying the nature of the latter. Four genetically determined diseases are manifested by HLH syndrome. These conditions are Family lymphohistiocytosis (LHF) syndrome, Chediak-Higashi CHS syndrome, Griscelli (GS) type 2 syndromes and X-linked lymphoproliferative (XLP 1 and 2). The mutated genes are respectively perforin Unc 13.4 and syntaxin in the LHF2, 3, 4 (10q locus genetic for LHF 1), CHS1/LYST (Lysosomal Trafficking regulator) in the CHS, in the Rab27a GS type 2, and XIAP and SH2D1A in the XLP. It is now well established that proteins encoded by these genes are necessary for the cytotoxic function of CD8 + and in the absence of these proteins is the cytotoxocity CD8 + deficient. Also, closed clinical and biological characteristics shared by pediatric genetic and adult forms suggest the existence of immune defects responsible for some or all HLH adult patients.

Official Title
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The Formation of a Cohort of HLHa Patients in Order to Study Their Physiopathological Characteristics

Conditions
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Hemophagocytic Syndrome

Intervention / Treatment
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* Biological: Identification of biological markers


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Major criteria: hemophagocytosis found in a specimen histology. Fever Splenomegaly Minor criteria: adenopathy cytopenia> 2 cell lines Hemoglobin <9 g / dl (less than 4 weeks and> 12 g / dl) Platelets <100 000 x 10 / l Neutrophils <1 10 / l hypertriglyceridaemia and / or hypofibrinogenaemia Elevated triglycerides> 3 mmol / l Fibrinogen <1.5 g / l Ferritin> 500 microg / L These criteria will be those used for the diagnosis of HLH in adults: One major criterion and two minor (including hyper ferritin or hypertriglyceridemia) 3 minor criteria (including hyper ferritin or hypertriglyceridemia) Exclusion Criteria: Pregnant women A person under guardianship Patients under the age of 2 years

Ages Eligible for Study
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Minimum Age: 2 Years

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 |
| --- | --- |
| hemophagocytic syndrome<br>patient with hemophagocytic syndrome | Biological: Identification of biological markers<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| biologicals criteria | measure of : cytokines expression (mmol/L) Hemoglobin (g/dl) number of Platelets (number/L) number of Neutrophils (number/L) number of triglycerides (mmol/L) number of fibrinogen (g/L) number of Ferritin (microg/L) | T0 (before traitment | 
| name of treatment | administrated treatments | T2 (T2 is the first day of treatment) | 
| Clinicals criteria | clinicals description of patients : Fever, Splenomegaly and adenopathy | T0 | 
| biologicals criteria | measure of : cytokines expression Hemoglobin level number of Platelets number of Neutrophils number of triglycerides> number of fibrinogen number of Ferritin | T1 (T1 is the first day of HLH syndrome) | 
| biologicals criteria | measure of : cytokines expression Hemoglobin level number of Platelets number of Neutrophils number of triglycerides> number of fibrinogen number of Ferritin | T2 (T2 is the first day of treatment) | 
| biologicals criteria | measure of : cytokines expression Hemoglobin level number of Platelets number of Neutrophils number of triglycerides> number of fibrinogen number of Ferritin | T4 (6 /12 months after the resolution of HLH) | 
| Clinicals criteria | clinicals description of patients : Fever, Splenomegaly and adenopathy | T1(T1 is the first day of HLH syndrome) | 
| Clinicals criteria | clinicals description of patients : Fever, Splenomegaly and adenopathy | T2 (T2 is the first day of treatment) | 
| Clinicals criteria | clinicals description of patients : Fever, Splenomegaly and adenopathy | T4 6 /12 months after the resolution of HLH) | 
| name of treatment | administrated treatments | T4(6/12 month after resolution of HLH) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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infant, adolescent and adult Hemophagocytic Syndrome, Hemophagocytic lymphohistiocytosis