Registry of Philadelphia-Negative Myeloproliferative Neoplasms

Inclusion Criteria: * diagnosis of (according to WHO 2008 criteria) Polycythemia Vera, Essential Thrombocythemia, Primary Myelofibrosis or Post-Polycythemia Vera/Post-Essential Thrombocythemia Myelofibrosis, Unclassifiable Myeloproliferative Neoplasm, Chronic Neutrophilic Leukemia, Chronic Eosinophilic Leukemia, Systemic Mastocytosis * diagnosis made since 2000 * patients who are being followed-up or not * signed informed consent form (for alive patients included in the prospective step of the study). Exclusion Criteria: * diagnosis of Chronic Myelogenous Leukemia * refusal to sign the informed consent form (for patients who are alive and will de included in the prospective step of the study.