Myeloproliferative Neoplasm
Conditions
Keywords
Myeloproliferative Neoplasm, Epigenetic age, Thrombosis, Myelofibrosis, Leukemia
Brief summary
Myeloproliferative Neoplasms (MPN) are hematological malignancies characterized by the excessive production of myeloid cells. MPN can be complicated by thrombosis and evolution into more aggressive diseases (myelofibrosis and acute leukemia). Aging remains the principal factor determining patients' survival in MPN. In recent years, DNA methylation has appeared as a mean to measure aging via the development of epigenetic clocks that have also been associated with the occurrence of thrombosis and cancer. The epiC project aims at determining epigenetic age of MPN patients and search for an association between this parameter and thrombotic/hematological complications.
Detailed description
Myeloproliferative Neoplasia (MPN) are hematological malignancies characterized by the excessive production of myeloid cells. They include Essential Thrombocythemia (ET), Polycythemia Vera (VP) and Primary Myelofibrosis (PMF). Thrombosis are the most frequent complications and are largely responsible for the morbidity and mortality observed in ET and PV patients. The most feared complications are hematological transformations (into myelofibrosis for PV and ET, into acute myeloid leukemia for PV, ET and PMF). The prognostic assessment of MPN patients is mainly based on clinical data. Although recent studies have shown that certain mutations are associated with a poorer prognosis, age remains the main risk factor affecting survival in MPN patients. Recent studies have shown that DNA methylation can be used to determine an epigenetic age. Interestingly, this epigenetic age is associated with the development of cardiovascular disease and cancer. In this project, the epigenetic age of MPN patients will be determined by studying the DNA methylation at diagnosis using the Infinium Human MethylationEPIC kit (Illumina). Epigenetic age will be determined with the most commonly used epigenetic clocks (DNAmAge, DNAmHannum, DNAmPhenoAge, DNAmSkinClock, DNAmGrimAge, intrinsic epigenetic age acceleration, extrinsic epigenetic age acceleration). It will be searched for an association between accelerated epigenetic aging (as assessed by the difference between epigenetic age and chronological age) and the type of MPN, the clinical and biological presentation at diagnosis (including the mutational profile of patients) and the occurrence of thrombosis and hematological evolution into myelofibrosis and/or acute leukemia.
Interventions
BIOLOGICALAssessment of the epigenetic age
Retrospective assessment of the epigenetic age on DNA samples obtained at diagnosis
Sponsors
University Hospital, Bordeaux
Study design
Observational model
COHORT
Time perspective
RETROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
For the 110 patients with MPN: * Patients with PV, ET or PMF * DNA extracted from purified granulocytes at time of diagnosis * No treatment likely to impact DNA methylation (chemotherapy, immunosuppressants in particular) For the 10 subjects without MPN: * Absence of hematological malignancy * Search for JAK2V617F mutation in the context of reactive thrombocytosis or secondary polycythemia * Absence of treatment likely to impact DNA methylation (chemotherapy, immunosuppressants in particular)
Exclusion criteria
For the 110 patients with MPN: * Patients without PV, ET or PMF * Patients without purified granulocytes DNA available at time of diagnosis * Patients treated by cytoreductive drug, demethylating agent, chemotherapy or immunosuppressive therapy at the time of DNA sampling * Patients with less than 2 years' follow-up For the 10 subjects in NMP : * Patients with hematological malignancy and/or solid cancer * Patients treated by cytoreductive drug, demethylating agent, chemotherapy or immunosuppressive therapy at the time of DNA sampling
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Accelerated ageing of patients | At inclusion, up to 1 year after diagnosis | Accelerated ageing will be defined as an increased difference between the epigenetic age (calculated from DNA methylation data with the different molecular clocks described: DNAmAge, DNAmHannum, DNAmPhenoAge, DNAmSkinClock, DNAmGrimAge, intrinsic epigenetic age acceleration, extrinsic epigenetic age acceleration) and the chronological age |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Transformation into secondary myelofibrosis or acute leukemia | From date of inclusion until documentation of the event, assessed up to 5 years | Evolution toward secondary myelofibrosis or acute leukemia will be defined according to the WHO classification of hematological malignancies |
| Occurrence of thrombosis prior to diagnosis or during follow-up of the disease | Between 1 year before and 2 years after MPN diagnosis | Occurrence of myocardial infarction, ischemic stroke, deep vein thrombosis, pulmonary embolism, splanchnic thrombosis or any other significant thrombosis. Tinnitus, vertigo, headaches, erythromelalgia as well as superficial vein thrombosis will not be considered as thrombotic events |
| Leukocytes | At inclusion, up to 1 year after diagnosis | Leukocytes level on blood count in G/L |
| Platelets | At inclusion, up to 1 year after diagnosis | Platelet level on blood count in G/L |
| Type of MPN (ET, PV or PMF) at diagnosis | At inclusion, up to 1 year after diagnosis | We will study patients with a diagnosis of ET, PV or PMF as defined by the WHO classification of hematological malignancies |
| Monocytes | At inclusion, up to 1 year after diagnosis | Monocytes level on blood count in G/L |
| Hemoglobin | At inclusion, up to 1 year after diagnosis | Hemoglobin level on blood count in g/dL |
| Hematocrit | At inclusion, up to 1 year after diagnosis | Hematocrit level on blood count in % |
| Additional somatic mutation | At inclusion, up to 1 year after diagnosis | In up to 50% of MPN patients, genetic variants can be detected in genes such as DNMT3A, TET2, ASXL1, SRSF2, SF3B1, U2AF1, EZH2 or TP53. We will determine which somatic genetic variant is detected by high throughput sequencing |
| Granulocytes | At inclusion, up to 1 year after diagnosis | Granulocytes level on blood count in G/L |
Countries
France
Contacts
Primary ContactOlivier MANSIER
Outcome results
None listed