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

Annals of Hematology
|February 27, 2004
PubMed

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.