Myeloproliferative neoplasms (MPN)
Myeloproliferative neoplasms (MPN)
Updated: 10/11/2022
© Jun Wang, MD, PhD
General features
- Clonal myeloproliferation WITHOUT dysplasia
- More common in adults, middle age and older
- Progress to AML commonly from CML, but not other types of MPN
- Hepatosplenomegaly and lymphadenopathy due to extramedullary hematopoiesis
Key Laboratory findings
- Initially hypercellular marrow with increased circulating blood cells
- End in spent phase with marrow fibrosis and cytopenia
- < 20% blasts
Key morphological features
- Usually involving multiple lineages
- Usually no dysplastic changes
Genetic abnormalities
- Usually involving tyrosine kinase
Current classification
- Chronic myelogenous leukemia, BCR-ABL1–positive
- Chronic neutrophilic leukemia
- Polycythemia vera
- Primary myelofibrosis
- Essential thrombocythemia
- Chronic eosinophilic leukemia, not otherwise specified
- Mastocytosis
- Myeloproliferative neoplasms, unclassifiable
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