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Start free with EleplanAtypical chronic myeloid leukemia
ORPHA:98824Disease
Also called Subacute myeloid leukemia
What it is
A rare myelodysplastic/myeloproliferative neoplasm characterized by peripheral blood leukocytosis due to increased numbers of morphologically dysplastic neutrophils and their precursors, hypercellular bone marrow with granulocytic proliferation and dysplasia (with or without dysplasia in the erythroid and megakaryocytic lineages), and prominent dysgranulopoiesis, but no or minimal absolute basophilia or monocytosis. Blasts account for less than 20% of leukocytes in the blood and bone marrow. BCR-ABL1 fusion is absent, as well as PDGFRA, PDGFRB or FGFR1 rearrangement, or PCM1-JAK2. Patients may present with signs and symptoms related to splenomegaly, anemia, or thrombocytopenia. Prognosis is generally poor.
Key facts
- Prevalence
- <1 / 1 000 000 (annual incidence, Europe)
- Age of onset
- Adult
- Inheritance
- Not applicable
- Classified as
- Disease
Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.
Gene
ICD-10 codes
Related health topics
Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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