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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

2-Chlorodeoxyadenosine therapy for idiopathic hypereosinophilic syndrome.

Idiopathic hypereosinophilic syndrome (HES) is a rare disease with no established effective therapy. It has been reported that interleukin-5 (IL-5) produced by helper T cells plays a major role in the proliferation of eosinophils. The nucleotide analogue 2-chlorodeoxyadenosine (2-CdA), which induces excellent clinical responses in hairy cell leukemia, is known to suppress helper T cells; therefore, we used 2-CdA, alone or in combination with cytarabine, to treat patients with idiopathic HES. 2-CdA alone and combined with cytarabine resulted in a rapid and sustained decrease in circulating eosinophils in two patients with idiopathic HES that was refractory to steroids, hydroxyurea and cytarabine. The efficacy of 2-CdA alone and combined with cytarabine exceeded by far that of cytarabine alone. However, reverse transcription-polymerase chain reaction (RT-PCR) did not show production of IL-5 or granulocyte-macrophage colony-stimulating factor mRNA in T cells as previously reported, and multiple cytokine receptors were found on eosinophils in idiopathic HES, suggesting that IL-5 may not be the sole cytokine involved in the regulation of idiopathic HES. The clinical efficacy of 2-CdA in idiopathic HES needs to be established on a large group of patients.[1]


  1. 2-Chlorodeoxyadenosine therapy for idiopathic hypereosinophilic syndrome. Ueno, N.T., Zhao, S., Robertson, L.E., Consoli, U., Andreeff, M. Leukemia (1997) [Pubmed]
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