To the Editor: In some patients with idiopathic hypereosinophilicsyndrome, Cools et al. (March 27 issue)1 detected a FIP1L1-PDGFRAfusion gene that was associated with a dramatic response toimatinib mesylate. Along with the recent description of the"lymphocytic variant" of the hypereosinophilic syndrome,2 theirobservation will provide clinicians with cornerstones for tailoringthe management of this heterogeneous disease according to theunderlying pathogenic mechanisms.
In their discussion, Cools et al. state that the hypereosinophilicsyndrome is a myeloproliferative syndrome, thereby ignoringthe involvement of interleukin-5producing T cells inthe pathogenesis of hypereosinophilia in approximately one fourthof patients with . . . [Full Text of this Article]
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