PDGFRA and Chronic Eosinophilic Leukemia, Not Otherwise Specified: The clinical and laboratory features of the 28 patients included in the study are summarized in Table 1: after applying inclusion and exclusion criteria, they were diagnosed with CEL, NOS, myeloproliferative neoplasm with eosinophilia (MPN-Eo) or iHES in one patient each, or M/LN-Eo and PDGFRA rearrangement in four patients.