SMP: JAK-STAT Signalling Pathway in Familial Myeloproliferative Disorders

Sponsor

Assistance Publique - Hôpitaux de Paris (Other)

Overall Status

Completed

CT.gov ID

NCT00873574

Collaborator

(none)

234

Enrollment

Location

Duration (Months)

4.9

Patients Per Site Per Month

Study Details

Study Description

Brief Summary

The main goal of the study is to progress in our understanding of the molecular basis of myeloproliferative disorders of the bone marrow (polycythemia vera, essential thrombocythemia, primary myelofibrosis). The study will focus on the genes encoding factors implicated in the JAK-STAT pathway which has an essential role in these diseases

Condition or Disease	Intervention/Treatment	Phase
Myeloproliferative Disorders	Biological: Blood samples and buccal swabs

Detailed Description

Myeloproliferative disorders (MPD) are rare malignant diseases of the bone marrow characterized by a proliferation of differentiated blood cells during a long time and a possible transformation in an acute leukaemia.

The recent identification of a recurrent activating tyrosine kinase mutation V617F in the JAK2 gene provides a breakthrough in the understanding of the molecular mechanisms of these diseases. It can't explain nevertheless the phenotypic diversity of MPD and the occurrence of familial aggregations. The investigators have shown actually that the mutation V617F is a somatic one which is variably expressed among patients in the same family.Other somatic mutations and inherited factors, still unknown, may explain these discrepancies. JAK-STAT pathway has an essential role in non-CML MPD as was shown by the functional consequences of the V617F JAK2 mutation. Therefore, the investigators will focus our study on the genes encoding factors implicated in this signalling pathway. Two genetic approaches will be used: 1-study of known polymorphisms (SNP) of theses genes involved in the JAK-STAT pathway; 2-search of rare mutations located in specific regions (binding domain…) of candidate genes.The study is a national multicenter research based on the national network (55 centers) that the investigators have organized with the help of the French Society Of Hematology in 1998. The investigators propose to include 120 families defined by the presence of at least 2 cases of non CML MPD (WHO and PVSG criteria).The investigators have already collected 60 families (affected cases and control subject); the other 60 will be included in the next two years. In each family, only the two patients with MPD and one control will be included ( all the subjects above 18 years old). Peripheral blood samples (35ml) and buccal swabs will be collected for each subject. Hematologists and ONCOGENETICIANS will include the families, collect all the clinical and biological data and perform the collection of biological material from each subject included in the study according to approved rules.All the data will be anonymously registered on Access data base. Hematological studies will be done in the Immuno-Hematological Laboratory in Saint ANTOINE. Genetic studies will be conducted in the Genetic Department of Saint ANTOINE Hospital now transferred to Pitie-Salpetriere Hospital in Paris. The genetic study will be based on the analysis of 120 unrelated familial SMP cases (randomised) and 120 controls. The investigators will study 10 genes involved in the JAK-STAT pathway ( cytokine receptors, Janus kinases, regulatory factors).The genotyping of SNPs, selected from HAPMAP and CGEMS databases will be performed by quantitative PCR. The investigators plan to analyze 50 SNPs per subject i.e. 24000 genotypes (duplicate points). The analysis will be based on the allelic frequency comparison in the two groups using a bilateral paired t-test; 120 pairs of subjects (case control) allow to detect a 0.6 deviation standard of allelic frequency between cases and controls (alpha = 5%, beta = 10%). The search for rare mutations will be done by genomic sequencing of particular regions in candidates genes in the 120 affected cases.

Study Design

Study Type:

Observational

Actual Enrollment :

234 participants

Observational Model:

Case-Control

Time Perspective:

Cross-Sectional

Official Title:

Molecular Study of Factors Involved in JAK-STAT Signalling Pathway in Familial Myeloproliferative Disorders

Study Start Date :

Sep 1, 2008

Actual Primary Completion Date :

May 1, 2011

Actual Study Completion Date :

Sep 1, 2012

Arms and Interventions

Arm	Intervention/Treatment
1 2 patients with MPD for each family. One case for each family will be randomised ; the cohort will be of 120 patients.	Biological: Blood samples and buccal swabs Peripheral blood samples (35 ml) and buccal swabs
2 1 control for each family	Biological: Blood samples and buccal swabs Peripheral blood samples (35 ml) and buccal swabs

Arm

Intervention/Treatment

2 patients with MPD for each family. One case for each family will be randomised ; the cohort will be of 120 patients.

Biological: Blood samples and buccal swabs

Peripheral blood samples (35 ml) and buccal swabs

1 control for each family

Biological: Blood samples and buccal swabs

Peripheral blood samples (35 ml) and buccal swabs

Outcome Measures

Primary Outcome Measures

Allelic frequency comparison between the 2 cohorts [At the inclusion visit]

Secondary Outcome Measures

Undescribed gene mutations. [At the inclusion visit]

Eligibility Criteria

Criteria

Ages Eligible for Study:

18 Years and Older

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

Yes

Inclusion Criteria:

Patients affected with polycythemia vera, essential thrombocythemia or primary myelofibrosis
Familial cases
Subjects above 18 years old
Non affected controls