title: Most pediatric patients with essential thrombocythemia show hypersensitivity to erythropoietin in vitro, with rare JAK2 V617F-positive erythroid colonies.
abstract: Essential thrombocythemia (ET), a Philadelphia (Ph) chromosome negative chronic myeloproliferative disorder, is usually a disease of middle age and it is extremely rare in pediatric patients. In this report we studied 12 children diagnosed with ET and one child with thrombocytosis and family history of ET. We failed to detect JAK2 V617F mutation either in peripheral blood leukocytes or in separated platelets and granulocytes. Monoclonal hematopoiesis was noted in only one female patient. Erythroid progenitors of most of the patients displayed hypersensitivity to erythropoietin (Epo) in vitro; Epo-independent erythroid colonies (EECs) were detected in seven patients. Among EECs of three patients we observed rare colonies heterozygous or homozygous for the JAK2 V617F mutation. Our data suggest that childhood ET patients could bear minor JAK2 V617F-positive subclones.
authors: Department of Biology, Faculty of Medicine, Palacky University, Olomouc, Czech Republic.
authors: Jitka
authors: J
authors: Veselovska
authors: Dagmar
authors: D
authors: Pospisilova
authors: Sona
authors: S
authors: Pekova
authors: Monika
authors: M
authors: Horvathova
authors: Renata
authors: R
authors: Solna
authors: Jana
authors: J
authors: Cmejlova
authors: Radek
authors: R
authors: Cmejla
authors: Monika
authors: M
authors: Belickova
authors: Vladimir
authors: V
authors: Mihal
authors: Jan
authors: J
authors: Stary
authors: Vladimir
authors: V
authors: Divoky
mesh_terms: D000293:Adolescent; D002648:Child; D002999:Clone Cells; D015672:Erythroid Precursor Cells / Q000187:drug effects; D004920:Erythropoiesis; D004921:Erythropoietin / Q000097:blood / Q000494:pharmacology*; D005260:Female; D005838:Genotype; D006412:Hematopoietic Stem Cells; D006801:Humans; D053614:Janus Kinase 2 / Q000235:genetics*; D008297:Male; D009154:Mutation; D013920:Thrombocythemia, Essential / Q000235:genetics*; D013922:Thrombocytosis / Q000235:genetics
chemical_list: D004921:Erythropoietin; D053614:Janus Kinase 2