Absolute basophil count (ABC) was determined using an automated cell counter and recorded in addition to other hematological and clinical parameters, such as WBC; absolute neutrophil, lymphocyte, monocyte, and eosinophil counts; circulatory blasts; hemoglobin level; platelets; RDW; C reactive protein (CRP); LDH; age; gender; transfusional dependency; constitutional symptoms; blast phase disease; and JAK2, CALR, or MPL mutational status. The gene discussed is MPL; the disease is Blast Count.