Chronic eosinophilic leukemia with FIP1L1-PDGFRA rearrangement

TO THE EDITOR: We read an interesting paper by Shin et al. [1] in a recent issue of Blood Research, titled "Chronic eosinophilic leukemia (CEL) with a FIP1L1-PDGFRA rearrangement: Two case reports and a review of Korean cases". To our knowledge, CEL with FIP1L1-PDGFRA rearrangement is very rare in Korea, and only 4 cases have been reported to date [1,2,3] (Table 1). In this letter, we report an additional rare case of CEL with FIP1L1-PDGFRA rearrangement and briefly discuss the possibilities of ethnical differences of this rare gene rearrangement, specifically in the Korean population.