Identification of a novel imatinib responsive KIF5B-PDGFRA fusion gene following screening for PDGFRA overexpression in patients with hypereosinophilia.     ///    Identification of a novel imatinib responsive KIF5B-PDGFRA fusion gene following screening for PDGFRA overexpression in patients with hypereosinophilia..     ///    "Imatinib, a known inhibitor of PDGFRalpha, produced a complete cytogenetic response and disappearance of the KIF5B-PDGFRA fusion by PCR, from both genomic DNA and mRNA. "