| Summary: | The natural history of primary hypereosinophilia remains poorly defined, given the underlying disease heterogeneity. Recently, targeted NGS helps to establish clonality in a subset of patients with hypereosinophilia. We first reported the clonal evolution in a long-term follow-up patient with hypereosinophilia. This case initially presented with chronic eosinophilic leukemia, not otherwise specified (CEL-NOS), successively transformed to myelodysplastic syndromes (MDS) and acute myeloid leukemia(s-AML). We identified three mutations at CEL-NOS phase, five and seven mutations at MDS and s-AML stages, respectively. Our data illustrate the clonal dynamic process associated with disease evolution from CEL-NOS to s-AML. Keywords: Hypereosinophilia, Clonal evolution, Next generation sequencing
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