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Updated: May 14, 2026

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Diagnostic complexities of eosinophilia.

Nathan D Montgomery1, Cherie H Dunphy, Micah Mooberry

  • 1Departments of Pathology and Laboratory Medicine, Division of Hematopathology, University of North Carolina School of Medicine, Chapel Hill, NC 27599-7525, USA.

Archives of Pathology & Laboratory Medicine
|February 2, 2013
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Summary

Molecular tools have advanced the diagnosis and treatment of eosinophilia, moving beyond the traditional hypereosinophilic syndrome classification. Specific molecular findings, like FIP1L1-PDGFRA fusions, now guide targeted therapies for eosinophilic leukemias.

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Area of Science:

  • Hematology
  • Molecular Diagnostics
  • Oncology

Background:

  • Eosinophilia, a common hematologic abnormality, presents diverse etiologies.
  • Traditionally diagnosed as hypereosinophilic syndrome (HES), a diagnosis of exclusion.
  • Molecular advancements have refined understanding and classification of eosinophilic disorders.

Observation:

  • Specific molecular abnormalities, such as FIP1L1-PDGFRA fusions, are linked to chronic eosinophilic leukemias.
  • These molecular markers predict therapeutic response.
  • Improved understanding has shifted focus from HES to specific, mechanistically defined eosinophilias.

Findings:

  • Eosinophilia causes are categorized into reactive, clonal, and idiopathic.
  • Chromosomal rearrangements are key in identifying specific eosinophilic leukemias.
  • Molecular insights enable precise diagnoses for previously undiagnosed HES cases.

Implications:

  • Revolutionized treatment strategies for rare eosinophilic disorders.
  • Complicated the diagnostic and therapeutic approach to eosinophilia.
  • Frameworks for pathologists are essential for evaluating complex eosinophilia cases.