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https://www.readbyqxmd.com/read/27893163/sorafenib-and-azacitidine-as-salvage-therapy-for-relapse-of-flt3-itd-mutated-aml-after-allo-sct
#1
Christina Rautenberg, Kathrin Nachtkamp, Ariane Dienst, Pia Verena Schmidt, Claudia Heyn, Mustafa Kondakci, Ulrich Germing, Rainer Haas, Guido Kobbe, Thomas Schroeder
OBJECTIVE: Patients with acute myeloid leukemia (AML) carrying FLT3-ITD mutations (FLT3-ITD+) who relapse after allogeneic 3transplantation (allo-SCT) have a very dismal prognosis with the currently available treatment options. METHODS: We treated 8 patients with FLT3-ITD+ AML who had relapsed in median 91 days (range, 28 - 249) following allo-SCT with a combination of the multikinase inhibitor Sorafenib and the DNA methyltransferase inhibitor Azacitidine (Aza)...
November 28, 2016: European Journal of Haematology
https://www.readbyqxmd.com/read/27881871/diagnosis-and-relapse-cytogenetically-normal-acute-myelogenous-leukemia-without-flt3-itd-or-mll-ptd
#2
W Chien, Q-Y Sun, L-W Ding, A Mayakonda, S Takao, L Liu, S L Lim, K T Tan, M Garg, A De Sousa Maria Varela, J Xiao, N Jacob, K Behrens, C Stocking, M Lill, V Madan, N Hattori, G Sigal, S Ogawa, S Wakita, T Ikezoe, L-Y Shih, T Alpermann, T Haferlach, H Yang, H P Koeffler
Leukemia accepted article preview online, 24 November 2016. doi:10.1038/leu.2016.343.
November 24, 2016: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/27879203/fetal-and-neonatal-hematopoietic-progenitors-are-functionally-and-transcriptionally-resistant-to-flt3-itd-mutations
#3
Shaina N Porter, Andrew S Cluster, Wei Yang, Kelsey A Busken, Riddhi M Patel, Jiyeon A Ryoo, Jeffrey A Magee
The FLT3 Internal Tandem Duplication (FLT3(ITD)) mutation is common in adult acute myeloid leukemia (AML) but rare in early childhood AML. It is not clear why this difference occurs. Here we show that Flt3(ITD) and cooperating Flt3(ITD)/Runx1 mutations cause hematopoietic stem cell depletion and myeloid progenitor expansion during adult but not fetal stages of murine development. In adult progenitors, FLT3(ITD) simultaneously induces self-renewal and myeloid commitment programs via STAT5-dependent and STAT5-independent mechanisms, respectively...
November 23, 2016: ELife
https://www.readbyqxmd.com/read/27872058/a-randomised-assessment-of-adding-the-kinase-inhibitor-lestaurtinib-to-1st-line-chemotherapy-for-flt3-mutated-aml
#4
Steven Knapper, Nigel Russell, Amanda Gilkes, Robert K Hills, Rosemary E Gale, James D Cavenagh, Gail Jones, Lars Kjeldsen, Michael R Grunwald, Ian Thomas, Heiko Konig, Mark J Levis, Alan K Burnett
The clinical benefit of adding FLT3-directed small molecule therapy to standard first-line treatment of acute myeloid leukemia (AML) has not yet been established. As part of the UK AML15 and 17 trials, patients with previously-untreated AML and confirmed FLT3-activating mutations, mostly aged <60 years, were randomised to receive oral Lestaurtinib (CEP701), or not, following each of four cycles of induction and consolidation chemotherapy. Lestaurtinib was commenced 2 days after completing chemotherapy and administered in cycles of up to 28 days...
November 21, 2016: Blood
https://www.readbyqxmd.com/read/27872057/how-i-treat-flt3-mutated-aml
#5
Keith W Pratz, Mark Levis
FLT3-mutated acute myeloid leukemia (AML), despite not being recognized as a distinct entity in the World Health Organization (WHO) classification system, is readily recognized as a particular challenge by clinical specialists who treat acute leukemia. This is especially true with regards to the patients harboring the most common type of FLT3 mutation, the internal tandem duplication (FLT3-ITD) mutation. Here we present four patient cases from our institution and discuss how our management reflects what we have learned about this subtype of the disease...
November 21, 2016: Blood
https://www.readbyqxmd.com/read/27870947/subcellular-localization-of-the-flt3-itd-oncogene-plays-a-significant-role-in-the-production-of-nox-and-p22-phox-derived-reactive-oxygen-species-in-acute-myeloid-leukemia
#6
Jennifer N Moloney, Joanna Stanicka, Thomas G Cotter
Internal tandem duplication of the juxtamembrane domain of FMS-like tyrosine kinase 3 (FLT3-ITD) receptor is the most prevalent FLT3 mutation accounting for 20% of acute myeloid leukemia (AML) patients. FLT3-ITD mutation results in ligand-independent constitutive activation of the receptor at the plasma membrane and 'impaired trafficking' of the receptor in compartments of the endomembrane system, such as the endoplasmic reticulum (ER). FLT3-ITD expressing cells have been shown to generate increased levels of reactive oxygen species (ROS), in particular NADPH oxidase (NOX)-generated ROS which act as pro-survival signals...
November 11, 2016: Leukemia Research
https://www.readbyqxmd.com/read/27863389/nt1721-a-novel-epidithiodiketopiperazine-exhibits-potent-in-vitro-and-in-vivo-efficacy-against-acute-myeloid-leukemia
#7
Claudia M Kowolik, Min Lin, Jun Xie, Larry E Overman, David A Horne
Acute myeloid leukemia (AML) is an aggressive malignancy characterized by heterogeneous genetic and epigenetic changes in hematopoietic progenitors that lead to abnormal self-renewal and proliferation. Despite high initial remission rates, prognosis remains poor for most AML patients, especially for those harboring internal tandem duplication (ITD) mutations in the fms-related tyrosine kinase-3 (FLT3). Here, we report that a novel epidithiodiketopiperazine, NT1721, potently decreased the cell viability of FLT3-ITD+ AML cell lines, displaying IC50 values in the low nanomolar range, while leaving normal CD34+ bone marrow cells largely unaffected...
November 15, 2016: Oncotarget
https://www.readbyqxmd.com/read/27835920/-acute-myeloid-leukemia
#8
Jan Braess
Acute myeloid leukemia (AML) has been genetically characterized extensively and can now be subdivided into 9 to 11 pathogenetically different subtypes according to their profile of driver mutations. In clinical practice karyotyping and molecular analysis of NPM1, cEBPa and FLT3-ITD are required for treatment stratification and potentially genotype specific treatment. Some markers such as NPM1 not only offer prognostic information but can also serve as markers of minimal residual disease and thus have the potential to guide therapy in the future...
November 2016: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/27798920/pre-transplant-quantitative-determination-of-npm1-mutation-significantly-predicts-outcome-of-ailogeneic-hematopoietic-stem-cell-transplantation-in-patients-with-normal-karyotype-aml-in-complete-remission
#9
Michal Karas, Katerina Steinerova, Daniel Lysak, Marcela Hrabetova, Alexandra Jungova, Jiri Sramek, Pavel Jindra, Jiri Polivka, Lubos Holubec
BACKGROUND/AIM: Minimal residual disease (MRD) in patients with acute myeloid leukemia (AML) before allogeneic hematopoietic stem cell transplantation (alloHSCT) can influence the results of therapy. With the aim of evaluating the potential role of pre-transplant MRD, we studied the impact of pre-transplant MRD level on the outcome of alloHSCT in patients with AML in complete remission (CR). PATIENTS AND METHODS: From 2/2005 to 9/2014, 60 patients with a median age of 54 years (range=30-66 years) with normal karyotype-AML harboring nucleophosmin 1 (NPM1) mutation [53% Fms-related tyrosine kinase receptor 3 internal tandem duplication (FLT3/ITD)-positive] in first (n=45) or second (n=15) CR underwent myeloablative (n=16) or reduced-intensity (n=44) alloHSCT (27% related, 73% unrelated)...
October 2016: Anticancer Research
https://www.readbyqxmd.com/read/27797250/flt3-itd-mutations-in-acute-myeloid-leukemia-patients-in-northeast-thailand
#10
Piyawan Kumsaen, Goonnapa Fucharoen, Chittima Sirijerachai, Su-On Chainansamit, Nittaya Wisanuyothin, Pichayanan Kuwatjanakul, Surapon Wiangnon
The FLT3-ITD mutation is one of the most frequent genetic abnormalities in acute myeloid leukemia (AML) where it is associated with a poor prognosis. The FLT3-ITD mutation could, therefore, be a potential molecular prognostic marker important for risk-stratified treatment options. We amplified the FLT3 gene at exon 14 and 15 in 52 AML patients (aged between 2 months and 74 years) from 4 referral centers (a university hospital and 3 regional hospitals in Northeast Thailand), using a simple PCR method. FLT3-ITD mutations were found in 10 patients (19...
2016: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/27797237/frequency-of-flt3-itd-d835-gene-mutations-in-acute-myelogenous-leukemia-a-report-from-northeastern-iran
#11
Abolghasem Allahyari, Masoud Sadeghi, Hossein Ayatollahi, Hamed Najjaran Yazdi, Mohammad Tavakol
BACKGROUND: FLT3 is mutated in about 1/3 of acute myelogenous leukemia (AML) patients. The aim of the present study was to report the prevalence of FLT3 mutations and comparison with prognostic factors in AML patients in the Northeastern of Iran. MATERIALS AND METHODS: This cross-sectional study concerned 100 AML cases diagnosed based on bone marrow aspiration and peripheral blood. DNA for every AML patient was extracted and underwent PCR with FLT3-ITD primers. RESULTS: The mean age at diagnosis was 28...
2016: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/27778197/outcome-of-flt3-itd-positive-acute-myeloid-leukemia-impact-of-allogeneic-stem-cell-transplantation-and-tyrosine-kinase-inhibitor-treatment
#12
Maximilian Fleischmann, Ulf Schnetzke, Karin G Schrenk, Volker Schmidt, Herbert G Sayer, Inken Hilgendorf, Andreas Hochhaus, Sebastian Scholl
BACKGROUND: Activating mutations of the receptor tyrosine kinase FLT3 (fms-related tyrosine kinase 3) reflect the most frequent molecular aberration in acute myeloid leukemia (AML). In particular, FLT3 internal tandem duplications (FLT3-ITD) are characterized by an unfavorable prognosis and allogeneic stem cell transplantation (allogeneic SCT) in first complete remission is recommended. In case of imminent or frank relapse following allogeneic SCT, treatment with FLT3 tyrosine kinase inhibitors (TKI) constitutes a promising clinical approach to induce hematologic remission without conventional chemotherapy...
October 24, 2016: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/27775694/inhibition-of-flt3-in-aml-a-focus-on-sorafenib
#13
A Antar, Z K Otrock, J El-Cheikh, M A Kharfan-Dabaja, G Battipaglia, R Mahfouz, M Mohty, A Bazarbachi
FMS-like tyrosine kinase 3 (FLT3) is one of the most commonly mutated genes in AML. FLT3 is mutated in ~30% of patients with AML, either by internal tandem duplications (FLT3-ITD) of the juxta-membrane domain or by a point mutation, usually involving the tyrosine kinase domain. Several FLT3 tyrosine kinase inhibitors are being evaluated in multiple studies aiming at improving outcomes. The most widely used is sorafenib, a potent multikinase inhibitor approved for hepatocellular carcinoma and renal cell carcinoma...
October 24, 2016: Bone Marrow Transplantation
https://www.readbyqxmd.com/read/27773927/mzh29-is-a-novel-potent-inhibitor-that-overcomes-drug-resistance-flt3-mutations-in-acute-myeloid-leukemia
#14
B Xu, Y Zhao, X Wang, P Gong, W Ge
More than one-third of patients with acute myeloid leukemia (AML) harbor aberrant mutations in Fms-like tyrosine kinase 3 (FLT3). Among them, the internal tandem duplication (ITD) mutation predicts poor prognosis. MZH29 is a novel FLT3 inhibitor synthesized in our laboratory that showed that cellular and kinase assays sustained inhibitory effects on wild-type and mutant FLT3, including the FLT3-ITD, FLT3-D835H/Y/V and FLT3-K663Q mutants. More importantly, MZH29 retained its potent inhibitory effect against the FLT3-ITD/F691L mutation, a drug resistance mutation against the well-known FLT3 inhibitor, AC220...
November 18, 2016: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/27766571/strong-correlation-between-the-expression-levels-of-hdac4-and-sirt6-in-hematological-malignancies-of-the-adults
#15
Zsuzsanna Gaál, Éva Oláh, László Rejtő, Ferenc Erdődi, László Csernoch
Histone deacetylase enzymes, confirmed to have important role in the pathogenesis of leukemia, are promising targets of epigenetic treatment. However, in acute myeloid leukemia, our knowledge on their expression levels is limited, and controversial data have been published about their potential oncogenic or tumorsuppressor properties in solid tumors. In our study, the expression levels of HDAC4 and SIRT6 were evaluated via Western blot analysis in 45 bone marrow samples (2 uninfiltrated and 43 concerned by different kinds of hematological malignancies), including 32 specimens obtained from patients with newly diagnosed AML...
October 20, 2016: Pathology Oncology Research: POR
https://www.readbyqxmd.com/read/27760406/synergistic-cell-death-in-flt3-itd-positive-acute-myeloid-leukemia-by-combined-treatment-with-metformin-and-6-benzylthioinosine
#16
Himalee S Sabnis, Heath L Bradley, Shweta Tripathi, Wen-Mei Yu, William Tse, Cheng-Kui Qu, Kevin D Bunting
Current therapy for acute myeloid leukemia (AML) primarily includes high-dose cytotoxic chemotherapy with or without allogeneic stem cell transplantation. Targeting unique cellular metabolism of cancer cells is a potentially less toxic approach. Monotherapy with mitochondrial inhibitors like metformin have met with limited success since escape mechanisms such as increased glycolytic ATP production, especially in hyperglycemia, can overcome the metabolic blockade. As an alternative strategy for metformin therapy, we hypothesized that the combination of 6-benzylthioinosine (6-BT), a broad-spectrum metabolic inhibitor, and metformin could block this drug resistance mechanism...
October 5, 2016: Leukemia Research
https://www.readbyqxmd.com/read/27748370/dock2-interacts-with-flt3-and-modulates-the-survival-of-flt3-expressing-leukemia-cells
#17
M Wu, M Hamaker, L Li, D Small, A S Duffield
The FMS-like tyrosine kinase-3 (FLT3) gene is the most commonly mutated gene in acute myeloid leukemia (AML), and patients carrying internal tandem duplication (ITD) mutations have a poor prognosis. Long-term inhibition of FLT3 activity in these patients has been elusive. To provide a more complete understanding of FLT3 biology, a mass spectroscopy-based screen was performed to search for FLT3-interacting proteins. The screen identified dedicator of cytokinesis 2 (DOCK2), which is a guanine nucleotide exchange factor for Rho GTPases, and its expression is limited to hematolymphoid cells...
November 4, 2016: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/27748301/nucleophosmin-mutation-analysis-in-acute-myeloid-leukaemia-immunohistochemistry-as-a-surrogate-for-molecular-techniques
#18
Anita Chopra, Sushant Soni, Haraprasad Pati, Dev Kumar, Rahul Diwedi, Deepak Verma, Garima Vishwakama, Sameer Bakhshi, Suman Kumar, Ajay Gogia, Rajive Kumar
BACKGROUND & OBJECTIVES: Mutation of nucleophosmin (NPM1) gene in the absence of FLT3-ITD (FMS related tyrosine kinase 3 - internal tandem duplications) mutation carries a good prognosis in cytogenetically normal acute myeloid leukaemia (AML). NPM1, a multifunctional nucleolar phosphoprotein that shuttles between nucleus and cytoplasm, gets trapped in the cytoplasm when mutated. Immunohistochemical (IHC) demonstration of its aberrant cytoplasmic location (NPMc+) has been suggested as a simple substitute for the standard screening molecular method...
June 2016: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/27748272/high-fms-like-tyrosine-kinase-3-flt3-receptor-surface-expression-predicts-poor-outcome-in-flt3-internal-tandem-duplication-itd-negative-patients-in-adult-acute-myeloid-leukaemia-a-prospective-pilot-study-from-india
#19
Surender Kumar Sharawat, Vinod Raina, Lalit Kumar, Atul Sharma, Radhika Bakhshi, Sreenivas Vishnubhatla, Ritu Gupta, Sameer Bakhshi
BACKGROUND & OBJECTIVES: Mutations in fms-like tyrosine kinase 3 (FLT3) receptor have significant role in assessing outcome in patients with acute myeloid leukaemia (AML). Data for FLT3 surface expression in relation to FLT3 internal tandem duplication (ITD) status and outcome are not available from India. The objective of the current study was to investigate adult patients with AML for FLT3 expression and FLT3 ITD mutation, and their association with long-term outcome. METHODS: Total 51 consecutive de novo AML patients aged 18-60 yr were enrolled in the study...
May 2016: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/27736291/clinical-significance-of-galectin-3-in-patients-with-adult-acute-myeloid-leukemia-a-retrospective-cohort-study-with-long-term-follow-up-and-formulation-of-risk-scoring-system
#20
Na Gao, Wen-Zheng Yu, Nong-Jian Guo, Xue-Xia Wang, Jian-Rong Sun
Galectin-3 plays an increasingly important role in development and progression of tumor. However, little is known about the clinical impact of galectin-3 in non-acute promyelocytic leukemia (non-M3 AML). Peripheral blood of 298 patients with primary non-M3 AML and 30 normal donors was collected for measurement of galectin-3. Galectin-3 levels were significantly higher compared with the control group (p < .001). Patients with higher galectin-3 levels had lower CR rates (p = .001) and 1-year overall survival (OS) rates (p = ...
October 13, 2016: Leukemia & Lymphoma
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