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Complete molecular remission of chronic eosinophilic leukemia complicated by CNS disease after targeted therapy with
Norbert Frickhofen1, Elisabeth Märker-Hermann, Andreas Reiter
1Department of Hematology/Oncology, Dr.-Horst-Schmidt-Kliniken GmbH, Wiesbaden, Germany. norbert.frickhofen@hsk-wiesbaden.de
Insights
Chronic eosinophilic leukemia (CEL) can now be diagnosed using genetic markers. A patient with CEL and central nervous system issues responded well to imatinib due to a specific genetic mutation.
Area of Science:
- Hematology
- Oncology
- Molecular Biology
Background:
- Distinguishing hypereosinophilic disorders requires identifying clonal hematopoiesis.
- Chronic eosinophilic leukemia (CEL) is a distinct diagnosis characterized by specific genetic markers.
Observation:
- A 33-year-old male presented with central nervous system (CNS) involvement, a rare manifestation of CEL.
- The patient exhibited a remarkable clinical response to low-dose imatinib (Gleevec).
Findings:
- Molecular profiling revealed constitutive activation of the platelet-derived growth factor receptor-alpha (PDGFR-A).
- This PDGFR-A activation was identified as the underlying mechanism for imatinib sensitivity.
Implications:
- This case highlights the importance of molecular diagnostics in classifying hypereosinophilic disorders.
- Targeted therapy with imatinib can be effective for CEL patients with PDGFR-A alterations, even with CNS involvement.
Abstract:
Many cases of hypereosinophilia, formerly classified as hypereosinophilic syndrome, can now be characterized as chronic eosinophilic leukemia (CEL) based on the demonstration of characteristic genetic markers indicating clonality of hematopoiesis. Here we report on a 33-year-old male patient with central nervous system manifestations of CEL and an excellent response to low-dose imatinib (Glivec). Molecular analysis demonstrated a constitutive activation of the platelet-derived growth factor receptor-alpha (PDGFR-A) as the mechanism of responsiveness to imatinib.
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