The idiopathic hypereosinophilic syndrome and chronic eosinophilic leukemia

Česká verze

Authors: L. Chrobák; J. Voglová
Authors place of work: Oddělení klinické hematologie II. interní kliniky Lékařské fakulty UK a FN, Hradec Králové, přednosta prof. MUDr. Jaroslav Malý, CSc.
Published in the journal: Vnitř Lék 2005; 51(12): 1385-1393
Category: Přehledný referát

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Summary

Idiopathic hypereosinophilic syndrome is a heterogenous group of hematological disorders characterized by eosinophilia (> 1.5 x 10⁹/l) persistent for more than 6 months, exclusion of reactive eosinophilia from other causes, such as parasitic infections or allergy, and evidence of end-organ damage [22]. According to World Health Organization the exclusion includes all neoplastic disorders in which eosinophils are part of the neoplastic clone. Excluded should be also T cell population with aberant phenotype and abnormal cytokine production [7], recently considert also as „lymphocytic“ variants of the HES [42]. HES has to be reclassified as chronic eosinophilic leukemia (CEL) when there is evidence for clonality based on the presence of chromosomal abnormalities or inactivation in female patients [7]. The successful empiric treatment of patients with tyrosine kinase inhibitor imatinib (Glivec) suggested the presence of an imatinib-sensitive tyrosine kinase inhibitor. The identification of a specific intersticial chromosoma deletion del(4)(q12;q12) creating the FIP1L1-PDGFRA fusion gene confirmed this hypothesis. Patients carrying this gene should be reclassified as CEL and detection of this gene is a positive predictor for response to imatinib therapy [11,45]. Effective doses of imatinib are 100 mg/day. The side effects are minimal. The only exception is an acute left ventricular dysfunction which has been reported in three patients within the first week of treatment with imatinib [36,38]. Imatinib has been successfully used also in some patients with the constitutively activated thyrosine kinase ETV6-PDGFRβ [1] and in systemic mast cell disease associated with eosinophilia [35]. Other therapeutical options for HES/CEL have been mentioned. The resistence to imatinib and the possibilities how to overcome it are discussed.

Key words:
hypereosinophilia - chronic eosinophilic leukemia - imatinib

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