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Start free with EleplanChronic eosinophilic leukemia
ORPHA:168940Disease
What it is
A rare myeloproliferative neoplasm characterized by a clonal proliferation of eosinophilic precursors with persistent increase of eosinophils in peripheral blood and bone marrow, accompanied by increased blasts (<20%) or clonal cytogenetic or molecular genetic abnormalities. Cases with BCR-ABL1, PCM1-JAK2, ETV6-JAK2, or BCR-JAK2 fusion, or rearrangement of PDGFRA, PDGFRB, or FGFR1, are not included in this entity. Infiltration of the liver and spleen, as well as a variety of other organs, is typical. Patients may present with constitutional symptoms and signs and symptoms of organ involvement, such as endomyocardial fibrosis, peripheral neuropathy, central nervous system manifestations, respiratory symptoms, or rheumatological findings. Acute transformation is common.
Key facts
- Age of onset
- Adolescent, Adult, Childhood
- Inheritance
- Not applicable
- Classified as
- Disease
Recorded for the broader condition
- Prevalence
- 1-9 / 100 000 (annual incidence, Europe)Myeloproliferative neoplasm
Orphanet records these for the broader condition rather than for this specific form. They are a starting point, not a figure for this subtype — subtypes often differ, and some are defined by being rarer than the condition they sit under.
Genes
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
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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