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Decrease of externalized phosphatidylserine density on red blood cell‐derived microparticles in SCA patients treated with hydroxycarbamide

Hydroxycarbamide (HC) treatment has been shown to improve the clinical course of patients with sickle cell anaemia (SCA), a haemoglobinopathy resulting from a single base substitution in the beta-globin gene (HBB). SCA is characterized by chronic haemolytic anaemia and recurrent vascular occlusions leading to multisystemic complications. Several beneficial biological effects of HC have been documented (Halsey et al, 2003) but its impact on the concentration of circulating microparticles (MPs), a subtype of extracellular vesicles released from cytoplasmic membrane of activated or apoptotic cells and detected at high levels in sickle plasma, remains controversial (Hebbel et al, 2016). The aim of the present study was to compare the MP pattern in a group of SCA patients treated by HC and followed for 2 years.