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Morphologic bone marrow changes in patients with BCR-ABL-positive chronic myelogenous leukemia (CML) were investigated during treatment with the tyrosine kinase inhibitor STI571. Bone marrow trephine biopsy specimens from 23 pretreated patients with CML were examined morphologically and by
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Idiopathic myelofibrosis is a chronic myeloproliferative disorder being featured by progressive accumulation of connective tissue in concert with marked neovascularization (angiogenesis) of the bone marrow. Both fibrogenesis and angiogenesis are considered to develop consequent to the intramedullary
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Here we report on the use of a new real-time polymerase chain reaction (PCR) method to detect and quantify the activating gene mutation of the tyrosine kinase JAK2. We evaluated patients with myelofibrosis with myeloid metaplasia (MMM; n=25) for the gene mutation prior to allogeneic stem cell
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The prevalence of JAK2V617F tyrosine kinase mutation differs between various variants of myelofibrosis with the higher detection rate for patients with post-polycythemia vera myelofibrosis (post-PV MF; 91%) if compared to primary myelofibrosis (PMF; 45%) and post-essential thrombocythemia
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Myelofibrosis with myeloid metaplasia (MMM) is an uncommon chronic myeloproliferative disorder characterized by clonal stem cell proliferation and reactive non-clonal proliferation of bone marrow fibroblasts with fibrosis. In the absence of curative therapy, the current management for the majority
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Discovery of the activating mutation V617F in Janus Kinase 2 (JAK2(V617F)), a tyrosine kinase critically involved in receptor signaling, recently ignited interest in JAK2 inhibitor therapy as a treatment for myelofibrosis (MF). Herein, we describe the design and synthesis of a series of small
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The Src family kinase (SFK) member SRC is a major target in drug development because it is activated in many human cancers, yet deleterious SRC germline mutations have not been reported. We used genome sequencing and Human Phenotype Ontology patient coding to identify a gain-of-function mutation in
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Polycythemia vera (PV), essential thrombocythemia (ET), and myeloid metaplasia with myelofibrosis (MMM) are clonal disorders arising from hematopoietic progenitors. An internet-based protocol was used to collect clinical information and biological specimens from patients with these diseases.
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Angiogenesis is part of the pathophysiology of myelofibrosis with myeloid metaplasia (MMM). PTK787/ZK 222584 (PTK/ZK) is a novel inhibitor of vascular endothelial growth factor receptors. Twenty-nine patients with MMM received a continuous dosing schedule of PTK/ZK doses of 500 or 750 mg twice daily
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Genomic DNA from patients with idiopathic myelofibrosis (IMF) was screened by polymerase chain reaction (PCR) and conformation sensitive gel electrophoresis (CSGE) for mutations in the C-KIT gene (60 patients), as well as the C-FMS and FLT3 genes (40 patients). Intronic primers were used to amplify
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Constitutively active JAK2V617F and thrombopoietin receptor (TpoR) W515L/K mutants are major determinants of human myeloproliferative neoplasms (MPNs). We show that a TpoRW515 mutation (W515A), which we detected in 2 myelofibrosis patients, and the Delta5TpoR active mutant, where the juxtamembrane
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An association between an activating JAK2 mutation (JAK2(V617F)) and BCR/ABL-negative myeloproliferative disorders was recently reported in multiple simultaneous publications. In the current study, mutation analysis for JAK2(V617F) was performed in peripheral blood mononuclear cells (PBMC) from 157
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The incidence of cancer, including myeloproliferative neoplasms (MPNs), is projected to increase significantly due to the growing proportion of people aged > 65 years. These older individuals are a heterogeneous population in terms of fitness, comorbidity, and psychological reserve. Therefore, age
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Prevailing evidence suggests a decisive role of platelet-derived growth factors (PDGFs) and their receptors in primary myelofibrosis. While PDGF receptor β (PDGFRβ) expression is increased in bone marrow stromal cells of patients correlating with the grade of myelofibrosis, knowledge on the precise
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