Imatinib therapy in a patient with suspected chronic neutrophilic leukemia and FIP1L1-PDGFRA rearrangement

To the editor: A 54-year-old man with no significant past medical history presented with skin rash. Complete blood count showed a white blood cell count of 64 × 109/L (63% neutrophils, 2% eosinophils), hemoglobin 14 g/dL, and platelet count 166 × 109/L. Bone marrow evaluation showed a