myelodysplastic syndromes/tyrosine

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High expression of the receptor tyrosine kinase Tie-1 in acute myeloid leukemia and myelodysplastic syndrome.

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The tyrosine kinase receptor Tie-1 has been shown to play a role in angiogenesis and hematopoiesis. We evaluated the level of expression and clinical significance of Tie-1 protein in acute myeloid leukemia (AML) and myelodysplastic syndrome (MDS). We used western blot analysis to confirm and

Internal tandem duplication of fms-like tyrosine kinase 3 is associated with poor outcome in patients with myelodysplastic syndrome.

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BACKGROUND The prognostic significance of internal tandem duplication (ITD) of the fms-like tyrosine kinase 3 gene (FLT3) for patients with myelodysplastic syndrome (MDS) is not clearly defined. In the current study, the authors sought to assess the value of FLT3/ITD mutation status as a prognostic

[Successful treatment of acute non-lymphoblastic leukemia from myelodysplastic syndrome by combination of human macrophage colony-stimulating factor (M-CSF) and low dose cytosine arabinoside: M-CSF-induced proliferation and tyrosine phosphorylation in leukemic blasts].

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An 84-year-old woman was admitted with acute non-lymphoblastic leukemia transformed from myelodysplastic syndrome. We examined the signal transduction of the leukemic blasts. Stimulation of the blasts by macrophage colony-stimulating factor (M-CSF) resulted in tyrosine phosphorylation of several

Activity of Fgr protein-tyrosine kinase is reduced in neutrophils of patients with myelodysplastic syndromes and chronic myelogenous leukemia.

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The Fgr protein-tyrosine kinase, p55(c-fgr), is specifically expressed and functions in cells of myelomonocytic lineages. We examined levels of expression and enzymatic activity of p55(c-fgr) peripheral blood neutrophils of patients with myelodysplastic syndromes (MDS) and chronic myelogenous

SU5416, a small molecule tyrosine kinase receptor inhibitor, has biologic activity in patients with refractory acute myeloid leukemia or myelodysplastic syndromes.

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Increased bone marrow angiogenesis and vascular endothelial growth factor (VEGF) levels are adverse prognostic features in patients with acute myeloid leukemia (AML) or myelodysplastic syndromes (MDSs). VEGF is a soluble circulating angiogenic molecule that stimulates signaling via receptor tyrosine

Mutations of genes in the receptor tyrosine kinase (RTK)/RAS-BRAF signal transduction pathway in therapy-related myelodysplasia and acute myeloid leukemia.

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Mutations of the FLT3, c-KIT, c-FMS, KRAS, NRAS, BRAF and CEBPA genes in the receptor tyrosine kinase (RTK)/RAS-BRAF signal-transduction pathway are frequent in acute myeloid leukemia (AML). We examined 140 patients with therapy-related myelodysplasia or AML (t-MDS/t-AML) for point mutations of

The JAK2 V617F activating tyrosine kinase mutation is an infrequent event in both "atypical" myeloproliferative disorders and myelodysplastic syndromes.

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A somatic mutation in the JH2 autoinhibitory domain of the Janus kinase 2 (JAK2) tyrosine kinase was recently described in polycythemia vera, essential thrombocythemia, and myelofibrosis with myeloid metaplasia. The prevalence of this mutation in either "atypical" myeloproliferative disorders (MPDs)

Phase 1 study of PTK787/ZK 222584, a small molecule tyrosine kinase receptor inhibitor, for the treatment of acute myeloid leukemia and myelodysplastic syndrome.

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PTK787/ZK 222584 (PTK/ZK) is an oral angiogenesis inhibitor targeting vascular endothelial growth factor (VEGF) receptor tyrosine kinases, including VEGFR-1/Flt-1, VEGFR-2/KDR, VEGFR-3/Flt-4, the platelet-derived growth factor receptor tyrosine kinase and the c-kit protein tyrosine kinase. The

A phase II study of the oral VEGF receptor tyrosine kinase inhibitor vatalanib (PTK787/ZK222584) in myelodysplastic syndrome: Cancer and Leukemia Group B study 10105 (Alliance).

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BACKGROUND Angiogenesis is implicated in the pathophysiology and progression of myelodysplastic syndromes (MDS). Vatalanib (PTK787/ZK222584; Novartis and Schering AG) inhibits receptor tyrosine kinases of vascular endothelial growth factor, platelet derived growth factor and c-Kit. We examined

Phase IIB trial of oral Midostaurin (PKC412), the FMS-like tyrosine kinase 3 receptor (FLT3) and multi-targeted kinase inhibitor, in patients with acute myeloid leukemia and high-risk myelodysplastic syndrome with either wild-type or mutated FLT3.

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OBJECTIVE Mutations leading to constitutive activation of the FMS-like tyrosine kinase 3 receptor (FLT3) occur in blasts of 30% of patients with acute myeloid leukemia (AML). Midostaurin (PKC412; N-benzoylstaurosporin) is a multitargeted tyrosine kinase inhibitor, with demonstrated activity in

[Myelodysplastic syndrome with Philadelphia negative+8 clonal chromosomal abnormalities after tyrosine kinase inhibitors therapy for chronic myeloid leukemia: a case report and literature].

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The JAK2 V617F tyrosine kinase mutation in myelodysplastic syndromes (MDS) developing myelofibrosis indicates the myeloproliferative nature in a subset of MDS patients.

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The implication of 'unknown significance' variants in next-generation sequencing in diagnosis and donor selection for allogenic haematopoietic stem cell transplantation. Report of a case of myelodysplastic syndrome with a polymorphism in the tyrosine kinase 2 (TYK2) gene.

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De novo Philadelphia chromosome positive myelodysplastic syndrome: Report of two cases with brief literature review.

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Myelodysplastic syndromes (MDSs) are characteristically defined by the presence of specific karyotypic abnormalities, based on which they have been prognosticated. Translocation t(9;22)(q34;q11.2) (Philadelphia positive [Ph +ve]) and corresponding BCR-ABL fusion transcript is the defining parameter

Acquisition of FLT3 or N-ras mutations is frequently associated with progression of myelodysplastic syndrome to acute myeloid leukemia.

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The role of internal tandem duplication of fms-like tyrosine kinase 3 (FLT3/ITD), mutations at tyrosine kinase domain (FLT3/TKD) and N-ras mutations in the transformation of myelodysplastic syndrome (MDS) to AML was investigated in 82 MDS patients who later progressed to AML; 70 of them had paired

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