Allergy Asthma Respir Dis.  2015 Nov;3(6):387-395. 10.4168/aard.2015.3.6.387.

Recent advances in the classification and management of hypereosinophilia

Affiliations
  • 1Department of Internal Medicine, Inje University Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.
  • 2Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea. allergy21@hotmail.com

Abstract

Numerous disorders and etiologies may underlie increased eosinophil counts. Hypereosinophilia (HE) is defined as a peripheral blood eosinophil count greater than 1,500/mm3 and may be potentially harmful because of tissue damage. Hypereosinophilic syndrome (HES) also represents a heterogeneous disorder characterized by persistent HE with the evidence of organ dysfunction, clinical symptoms, or both caused by eosinophilia. The refining criteria and subclassification of HE and HES are currently being revised on cellular and molecular based diagnostic methods. Initial approaches focus on evaluating various underlying causes, including helminthic infections, adverse drug reactions, allergic diseases, and neoplastic diseases. When secondary causes of HE are excluded, the workup should proceed to the evaluation of primary/clonal bone marrow disease, including fip 1-like 1-platelet driven growth factor receptor alpha (FIP1L1-PDGFRA) mutation. Concurrently, if the patient has symptoms and signs, organ damage or dysfunction must be evaluated. Although, corticosteroids are the mainstay of therapy in confirmed HES, imatinib is considered a definitive treatment for FIP1L1-PDGFRA, platelet driven growth factor receptor beta rearranged HE and HES. In this article, we discuss recent advances in the classification of and practical approaches to HE and HES. In addition, we introduce several promising therapies for HE and HES.

Keyword

Hypereosinophilic syndrome; FIP1L1-PDGFRA; Molecular targeted therapy

MeSH Terms

Adrenal Cortex Hormones
Blood Platelets
Bone Marrow Diseases
Classification*
Drug-Related Side Effects and Adverse Reactions
Eosinophilia
Eosinophils
Helminths
Humans
Hypereosinophilic Syndrome
Molecular Targeted Therapy
Imatinib Mesylate
Adrenal Cortex Hormones

Figure

  • Fig. 1 Algorithm for diagnosis and treatment of hypereosinophilia. Adapted from Roufosse F, et al. J Allergy Clin Immunol 2010;126:39-44,18 with permission of Elsevier Ltd. CBC, complete blood count; PFT, pulmonary function test; CT, computed tomography; EKG, electrocardiogram; FISH, fluorescent in situ hybridization; HES, hypereosinophilic syndrome; RT-PCR, reverse transcription polymerase chain reaction; TCR, T-cell receptor; BM, bone marrow; CS, corticosteroids.


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