Chronic eosinophilic leukemia, NOS with t(5;12)(q31;p13)/ETV6-ACSL6 gene fusion: a novel variant of myeloid proliferative neoplasm with eosinophilia.

The 2008 World Health Organization (WHO) classification of tumors of hematopoietic and lymphoid tissues introduced a category for myeloid and lymphoid neoplasms with eosinophilia and abnormalities of PDGFRA, PDGFRB or FGFR1. Many of these patients are responsive to tyrosine kinase inhibitor (TKI) therapy. In this , we report a unique case of chronic eosinophlic leukemia with novel t(5;12) (q23-31;p13)/ETV6-ACSL6 gene fusion, in which patient was resistant to TKI therapy.