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Author Spotlight: Investigating the Pathophysiology of Eosinophilic Esophagitis
Published on: May 10, 2024
(A Critical Appraisal of) Classification of Hypereosinophilic Disorders
Jean Emmanuel Kahn1, Matthieu Groh2, Guillaume Lefèvre3
1Service de Médecine Interne, Centre de Référence des Syndromes Hyperéosinophiliques-CEREO, Hôpital Foch, Université Versailles-Saint Quentin en Yvelines, Suresnes, France.
Insights
Hypereosinophilia (HE) classification has evolved, focusing on organ damage and molecular mechanisms. Current criteria aid diagnosis but require refinement for better standardization and clinical relevance in daily practice.
Area of Science:
- Hematology
- Immunology
- Internal Medicine
Background:
- Hypereosinophilia (HE) presents heterogeneously across inflammatory, allergic, infectious, and neoplastic diseases.
- Diagnostic criteria for hypereosinophilic syndromes (HES) have evolved since 1975, emphasizing eosinophil-related organ damage.
- Molecular and cellular mechanisms are increasingly central to classifying HE-related diseases.
Purpose of the Study:
- To review the current knowledge on classification and diagnostic criteria for HE-related diseases.
- To analyze the strengths and weaknesses of existing HE/HES classification concepts.
- To assess the utility of current diagnostic approaches in clinical practice.
Main Methods:
- Review of historical and current diagnostic criteria for HE and HES.
- Analysis of the evolution of classification systems based on pathophysiology and molecular mechanisms.
- Evaluation of the clinical utility and limitations of current diagnostic standards.
Main Results:
- Diagnostic criteria have progressed from initial definitions to incorporating organ damage and molecular insights.
- The 2011 International Cooperative Working Group criteria advanced conceptual clarity in HE.
- Challenges remain in standardizing molecular tools and defining the clinical relevance of HES subtypes.
Conclusions:
- Current HE/HES classification and diagnostic criteria offer a framework but require further refinement.
- Standardization of diagnostic tools and clarification of subtype relevance are crucial for improved clinical practice.
- Ongoing research is needed to address unanswered questions in the diagnosis and classification of HE-related disorders.
Abstract:
Hypereosinophilia (HE) is a heterogeneous condition that can be reported in various (namely inflammatory, allergic, infectious, or neoplastic) diseases with distinct pathophysiological pathways. In 1975, Chusid et al. published the first diagnostic criteria of hypereosinophilic syndromes (HES). Over the years, as both basic and clinical knowledge improved, several updates have been suggested, with a focus on better distinguishing isolated or asymptomatic eosinophilia from diseases with specific eosinophil-related organ damage. Moreover, underlying molecular and cellular mechanisms of eosinophilia gradually became the cornerstone of successive attempts to classify HE-related diseases. In 2011, the International Cooperative Working Group on Eosinophil Disorders criteria emerged from a multidisciplinary Working Conference on Eosinophil Disorders and Syndromes, and provided substantial contribution to the clarification of general concepts and definitions in the field of HE. Yet, owing to the low prevalence of HE/HES, to the numerous diseases encompassed in the spectrum of HE-related disorders (with sometimes overlapping phenotypes), many questions are left unanswered (e.g., the need to better standardize the use of modern molecular tools, or the clinical relevance of distinguishing different subtypes of idiopathic HES). Here, we review the current state of knowledge in the fields of classification and diagnosis criteria of HE-related diseases, with emphasis on the analysis of both strengths and weaknesses of present concepts and their usefulness in daily practice.
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