Clinical Research Directory

Inclusion Criteria: * Adults (age ≥18 years), * Affiliated to the national social security system, * ASXL1 mutated primary or secondary myelofibrosis, * Signed the consent to participate in the study, * Included, or consenting to be included, in the national clinical-biological database of France Intergroupe Syndrome Myéloprolifératifs (FIM). Exclusion Criteria: * Patient with another active hematological disease or cancer at the time of diagnosis, * Person subject to legal protection scheme or incapable of giving consent.