Functional and Phenotypic Characterization of Monocytes in Myeloproliferative Syndromes

Inclusion Criteria: * Diagnosis of PV, ET, pre-myelofibrosis or primary myelofibrosis according to WHO 2022 criteria (including BOM for ET, premyelofibrosis and primary myelofibrosis) * Patient who has not received treatment specific to hemopathy at the time of sampling * Obtaining the signature of consent to participate in the study * Patient having consented to be included in the "Malignant Hemopathy" collection of Angers University Hospital and in FIMBANK database Exclusion Criteria: * Person not affiliated to a social security scheme or beneficiary of such a scheme * Patient with another hemopathy or another active cancer at the time of diagnosis * Minor patient at diagnosis (\< 18 years old) * Patient not capable or without agreement from the guardian or legal representative