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https://www.readbyqxmd.com/read/28212557/using-high-sensitivity-sequencing-for-the-detection-of-mutations-in-btk-and-plc%C3%AE-2-genes-in-cellular-and-cell-free-dna-and-correlation-with-progression-in-patients-treated-with-btk-inhibitors
#1
Adam Albitar, Wanlong Ma, Ivan DeDios, Jeffrey Estella, Inhye Ahn, Mohammed Farooqui, Adrian Wiestner, Maher Albitar
Patients with chronic lymphocytic leukemia (CLL) that develop resistance to Bruton tyrosine kinase (BTK) inhibitors are typically positive for mutations in BTK or phospholipase c gamma 2 (PLCγ2). We developed a high sensitivity (HS) assay utilizing wild-type blocking polymerase chain reaction achieved via bridged and locked nucleic acids. We used this high sensitivity assay in combination with Sanger sequencing and next generation sequencing (NGS) and tested cellular DNA and cell-free DNA (cfDNA) from patients with CLL treated with the BTK inhibitor, ibrutinib...
February 13, 2017: Oncotarget
https://www.readbyqxmd.com/read/28202459/il-4-cxcl12-loop-is-a-key-regulator-of-lymphoid-stroma-function-in-follicular-lymphoma
#2
Shubham Pandey, Frédéric Mourcin, Tony Marchand, Saba Nayar, Marion Guirriec, Céline Pangault, Céline Monvoisin, Patricia Amé-Thomas, Fabien Guilloton, Joelle Dulong, Mark Coles, Thierry Fest, Anja Mottok, Francesca Barone, Karin Tarte
Follicular lymphoma (FL) is the most frequent indolent lymphoma and is characterized by the accumulation of germinal center-derived malignant B cells engaged in a bidirectional crosstalk with their supportive microenvironment in invaded lymph nodes (LN) and bone marrow (BM). T follicular helper cells (TFH) and infiltrating stromal cells have been shown to favor FL B-cell growth but the mechanisms of their protumoral effect and how LN/BM microenvironment is converted into a lymphoma-permissive cell niche remain poorly understood...
February 15, 2017: Blood
https://www.readbyqxmd.com/read/28202458/sensitivity-to-pi3k-and-akt-inhibitors-is-mediated-by-divergent-molecular-mechanisms-in-subtypes-of-dlbcl
#3
Tabea Erdmann, Pavel Klener, James T Lynch, Michael Grau, Petra Vočková, Jan Molinsky, Diana Tuskova, Kevin Hudson, Urszula M Polanska, Michael Grondine, Michele Mayo, Beiying Dai, Matthias Pfeifer, Kristian Erdmann, Daniela Schwammbach, Myroslav Zapukhlyak, Annette M Staiger, German Ott, Wolfgang E Berdel, Barry R Davies, Francisco Cruzalegui, Marek Trneny, Peter Lenz, Simon T Barry, Georg Lenz
Activated B-cell-like (ABC) and germinal center B-cell-like (GCB) diffuse large B-cell lymphoma (DLBCL) represent the two major molecular DLBCL subtypes. They are characterized by differences in clinical course and by divergent addiction to oncogenic pathways. To determine activity of novel compounds in these two subtypes, we conducted an unbiased pharmacologic in vitro screen. The phosphatidylinositol-3-kinase (PI3K) alpha/delta (PI3Kα/δ) inhibitor AZD8835 showed marked potency in ABC DLBCL models, whereas the protein kinase B (AKT) inhibitor AZD5363 induced apoptosis in PTEN-deficient DLBCLs irrespective of their molecular subtype...
February 15, 2017: Blood
https://www.readbyqxmd.com/read/28185174/current-treatment-of-chronic-lymphocytic-leukemia
#4
REVIEW
Krzysztof Jamroziak, Bartosz Puła, Jan Walewski
A number of new treatment options have recently emerged for chronic lymphocytic leukemia (CLL) patients, including the Bruton's tyrosine kinase (BTK) inhibitor ibrutinib, phosphatidylinositol-3-kinase (PI3K) delta isoform inhibitor idelalisib combined with rituximab, the Bcl-2 antagonist venetoclax, and the new anti-CD20 antibodies obinutuzumab and ofatumumab. Most of these agents are already included into treatment algorithms defined by international practice guidelines, but more clinical investigations are needed to answer still remaining questions...
January 2017: Current Treatment Options in Oncology
https://www.readbyqxmd.com/read/28182323/ibrutinib-associated-bleeding-pathogenesis-management-and-risk-reduction-strategies
#5
REVIEW
Joseph J Shatzel, Sven R Olson, Derrick L Tao, Owen J T McCarty, Alexey V Danilov, Thomas G DeLoughery
Ibrutinib is an irreversible inhibitor of Bruton's tyrosine kinase (Btk) that has proven to be an effective therapeutic agent for multiple B-cell mediated lymphoproliferative disorders. Ibrutinib, however, carries an increased bleeding risk compared to standard chemotherapy. Bleeding events range from minor mucocutaneous bleeding to life-threatening hemorrhage, due in large part to the effects of ibrutinib on several distinct platelet signaling pathways. There is currently minimal data to guide clinicians regarding the use of ibrutinib in patients at high risk for bleeding or on anticoagulant or antiplatelet therapy...
February 9, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28178345/pi3k%C3%AE-inhibitor-idelalisib-in-combination-with-btk-inhibitor-ono-gs-4059-in-diffuse-large-b-cell-lymphoma-with-acquired-resistance-to-pi3k%C3%AE-and-btk-inhibitors
#6
Anella Yahiaoui, Sarah A Meadows, Rick A Sorensen, Zhi-Hua Cui, Kathleen S Keegan, Robert Brockett, Guang Chen, Christophe Quéva, Li Li, Stacey L Tannheimer
Activated B-cell-like diffuse large B-cell lymphoma relies on B-cell receptor signaling to drive proliferation and survival. Downstream of the B-cell receptor, the key signaling kinases Bruton's tyrosine kinase and phosphoinositide 3-kinase δ offer opportunities for therapeutic intervention by agents such as ibrutinib, ONO/GS-4059, and idelalisib. Combination therapy with such targeted agents could provide enhanced efficacy due to complimentary mechanisms of action. In this study, we describe both the additive interaction of and resistance mechanisms to idelalisib and ONO/GS-4059 in a model of activated B-cell-like diffuse large B-cell lymphoma...
2017: PloS One
https://www.readbyqxmd.com/read/28167659/targeting-btk-with-ibrutinib-in-relapsed-refractory-marginal-zone-lymphoma
#7
Ariela Noy, Sven de Vos, Catherine Thieblemont, Peter Martin, Christopher R Flowers, Franck Morschhauser, Graham P Collins, Shuo Ma, Morton Coleman, Shachar Peles, Stephen Smith, Jacqueline C Barrientos, Alina Smith, Brian Munneke, Isaiah Dimery, Darrin M Beaupre, Robert Chen
Marginal zone lymphoma (MZL) is a heterogeneous B-cell malignancy for which no standard treatment exists. MZL is frequently linked to chronic infection, which may induce B-cell receptor (BCR) signaling resulting in aberrant B-cell survival and proliferation. We conducted a multicenter, open-label, phase 2 study to evaluate the efficacy and safety of ibrutinib in previously treated MZL. Patients with histologically-confirmed MZL of all subtypes who received ≥1 prior therapy with an anti-CD20 antibody-containing regimen were treated with ibrutinib 560 mg orally once daily until progression or unacceptable toxicity...
February 6, 2017: Blood
https://www.readbyqxmd.com/read/28155013/targeted-therapy-in-chronic-lymphocytic-leukemia-cll
#8
REVIEW
Erin M Pettijohn, Shuo Ma
The standard of care for the treatment of chronic lymphocytic leukemia (CLL) has traditionally been chemoimmunotherapy. For patients who are unable to tolerate chemotherapy and those with high risk 17p deletions, there were previously few feasible or efficacious treatment options. Novel targeted agents for the treatment of CLL have the potential to offer long-term, durable remissions and offer promising treatment options for those in previously challenging population groups. Current targeted agents in CLL are directed against B cell receptor-associated tyrosine kinases such as BTK and SYK, the downstream PI3-kinase pathway, as well as the antiapoptotic protein BCL-2...
February 2, 2017: Current Hematologic Malignancy Reports
https://www.readbyqxmd.com/read/28154084/lymphocyte-activation-gene-3-a-novel-therapeutic-target-in-chronic-lymphocytic-leukemia
#9
Mika Shapiro, Yair Herishanu, Ben-Zion Katz, Nili Dezorella, Clare Sun, Sigi Kay, Aaron Polliack, Irit Avivi, Adrian Wiestner, Chava Perry
A novel therapeutic approach in cancer, attempting to stimulate host anti-tumor immunity, involves blocking of immune checkpoints. LAG3 is an immune checkpoint receptor expressed on activated/exhausted T-cells. When engaged by MHC class II molecules, LAG3 negatively regulates T-cell function thereby contributing to tumor escape. Intriguingly, a soluble LAG3 variant activates both immune and malignant MHC class II-presenting cells. In this study, we examined the role of LAG3 in the pathogenesis of chronic lymphocytic leukemia, an MHC class II-presenting malignancy, and show that chronic lymphocytic leukemia cells express and secrete LAG3...
February 2, 2017: Haematologica
https://www.readbyqxmd.com/read/28147336/dual-inhibition-of-histone-deacetylases-and-phosphoinositide-3-kinase-enhances-therapeutic-activity-against-b-cell-lymphoma
#10
Patrizia Mondello, Enrico Derenzini, Zahra Asgari, John Philip, Elliott J Brea, Venkatraman Seshan, Ronald C Hendrickson, Elisa de Stanchina, David A Scheinberg, Anas Younes
Phosphoinositide 3-kinase (PI3K) and Myc are known to cooperate in promoting the survival and growth of a variety of B-cell lymphomas. While currently there are no small molecule inhibitors of Myc protein, histone deacetylase (HDAC) inhibitors have been shown to reduce levels of Myc protein by suppressing its transcription. We assessed the efficacy of CUDC-907, a new rationally designed dual inhibitor of PI3K and HDACs, in a panel of lymphoma cell lines. CUDC-907 treatment resulted in a dose- and time-dependent growth inhibition and cell death of DLBCL cell lines, irrespective of the cell of origin...
January 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28146266/how-i-manage-patients-with-hairy-cell-leukaemia
#11
REVIEW
Philip A Thompson, Farhad Ravandi
Patients with hairy cell leukaemia (HCL) have highly favourable outcomes after purine analogue therapy. However, most patients subsequently relapse and require re-treatment. A minority of patients develop purine analogue-refractory disease. Targeted therapies have improved outcomes for such patients. Recently, the BRAF V600E mutation was identified in most patients with classical HCL, resulting in constitutive mitogen-activated protein kinase pathway activation; impressive responses are achieved in heavily pre-treated patients with BRAF inhibition...
February 1, 2017: British Journal of Haematology
https://www.readbyqxmd.com/read/28141917/enhanced-bruton-s-tyrosine-kinase-activity-in-peripheral-blood-b-lymphocytes-of-autoimmune-disease-patients
#12
Odilia B J Corneth, Gwenny M P Verstappen, Sandra M J Paulissen, Marjolein J W de Bruijn, Jasper Rip, Melanie Lukkes, Jan Piet van Hamburg, Erik Lubberts, Hendrika Bootsma, Frans G M Kroese, And Rudi W Hendriks
OBJECTIVE: Bruton's tyrosine kinase (BTK) transmits crucial survival signals from the B cell receptor (BCR) in B cells. Pharmacological BTK inhibition effectively diminishes disease symptoms in mouse models of autoimmunity and, conversely, transgenic BTK overexpression induces systemic autoimmunity in mice. We investigated BTK expression and activity in human B cells in the context of autoimmune disease. METHODS: Using intracellular flow cytometry, we quantified BTK expression and phosphorylation in peripheral blood B cell subsets in patients with rheumatoid arthritis (RA; n=30) and primary Sjogren's Syndrome (pSS; n=26) and matched healthy controls...
January 31, 2017: Arthritis & Rheumatology
https://www.readbyqxmd.com/read/28140585/discovery-of-2-3-acrylamido-4-methylphenyl-amino-n-2-methyl-5-3-4-5-trimethoxybenzamido-phenyl-4-methylamino-pyrimidine-5-carboxamide-chmfl-bmx-078-as-a-highly-potent-and-selective-type-ii-irreversible-bone-marrow-kinase-in-the-x-chromosome-bmx-kinase-inhibitor
#13
Xiaofei Liang, Fengchao Lv, Beilei Wang, Kailin Yu, Hong Wu, Ziping Qi, Zongru Jiang, Cheng Chen, Aoli Wang, Weili Miao, Wenchao Wang, Zhenquan Hu, Juan Liu, Xiaochuan Liu, Zheng Zhao, Li Wang, Shanchun Zhang, Zi Ye, Chu Wang, Tao Ren, Yinsheng Wang, Qingsong Liu, Jing Liu
BMX is a member of TEC family non-receptor tyrosine kinase and is involved in a variety of critical physiological and pathological processes. Through combination of irreversible inhibitor design and type II inhibitor design approaches, we have discovered a highly selective and potent type II irreversible BMX kinase inhibitor compound 41 (CHMFL-BMX-078), which exhibited an IC50 of 11 nM by formation of a covalent bond with cysteine 496 residue in the DFG-out inactive conformation of BMX. It displayed a high selectivity profile (S score(1)=0...
January 31, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28138560/leukemia-cell-proliferation-and-death-in-chronic-lymphocytic-leukemia-patients-on-therapy-with-the-btk-inhibitor-ibrutinib
#14
Jan A Burger, Kelvin W Li, Michael J Keating, Mariela Sivina, Ahmed M Amer, Naveen Garg, Alessandra Ferrajoli, Xuelin Huang, Hagop Kantarjian, William G Wierda, Susan O'Brien, Marc K Hellerstein, Scott M Turner, Claire L Emson, Shih-Shih Chen, Xiao-Jie Yan, Dominik Wodarz, Nicholas Chiorazzi
BACKGROUND. Ibrutinib is an effective targeted therapy for patients with chronic lymphocytic leukemia (CLL) that inhibits Bruton's tyrosine kinase (BTK), a kinase involved in B cell receptor signaling. METHODS. We used stable isotopic labeling with deuterated water ((2)H2O) to measure directly the effects of ibrutinib on leukemia cell proliferation and death in 30 patients with CLL. RESULTS. The measured average CLL cell proliferation ("birth") rate before ibrutinib therapy was 0.39% of the clone per day (range 0...
January 26, 2017: JCI Insight
https://www.readbyqxmd.com/read/28131592/the-role-of-chromatographic-and-chiroptical-spectroscopic-techniques-and-methodologies-in-support-of-drug-discovery-for-atropisomeric-drug-inhibitors-of-bruton-s-tyrosine-kinase
#15
Jun Dai, Chunlei Wang, Sarah C Traeger, Lorell Discenza, Mary T Obermeier, Adrienne A Tymiak, Yingru Zhang
Atropisomers are stereoisomers resulting from hindered bond rotation. From synthesis of pure atropisomers, characterization of their interconversion thermodynamics to investigation of biological stereoselectivity, the evaluation of drug candidates subject to atropisomerism creates special challenges and can be complicated in both early drug discovery and later drug development. In this paper, we demonstrate an array of analytical techniques and systematic approaches to study the atropisomerism of drug molecules to meet these challenges...
March 3, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28122968/phosphoprotein-profiles-of-candidate-markers-for-early-cellular-responses-to-low-dose-%C3%AE-radiation-in-normal-human-fibroblast-cells
#16
Ji-Hye Yim, Jung Mi Yun, Ji Young Kim, In Kyung Lee, Seon Young Nam, Cha Soon Kim
Ionizing radiation causes biological damage that leads to severe health effects. However, the effects and subsequent health implications caused by exposure to low-dose radiation are unclear. The objective of this study was to determine phosphoprotein profiles in normal human fibroblast cell lines in response to low-dose and high-dose γ-radiation. We examined the cellular response in MRC-5 cells 0.5 h after exposure to 0.05 or 2 Gy. Using 1318 antibodies by antibody array, we observed ≥1.3-fold increases in a number of identified phosphoproteins in cells subjected to low-dose (0...
January 24, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28114285/hsp90-stabilizes-b-cell-receptor-kinases-in-a-multi-client-interactome-pu-h71-induces-cll-apoptosis-in-a-cytoprotective-microenvironment
#17
A Guo, P Lu, J Lee, C Zhen, G Chiosis, Y L Wang
Chronic lymphocytic leukemia (CLL) is characterized by the accumulation of B cells in the hematopoietic system and lymphoid tissues. Although inhibitors targeting the B-cell receptor (BCR) pathway have been successful in the treatment of the disease, the underlying mechanisms leading to BCR over-activity in CLL are not fully understood. In this study, we found that HSP90, a highly conserved molecular chaperone, is overexpressed in CLL compared with resting B cells. HSP90 overexpression is accompanied by the overexpression of several BCR kinases including LYN, spleen tyrosine kinase, Bruton tyrosine kinase and AKT...
January 23, 2017: Oncogene
https://www.readbyqxmd.com/read/28112746/risk-factors-for-treatment-failure-after-allogeneic-transplantation-of-patients-with-cll-a-report-from-the-european-society-for-blood-and-marrow-transplantation
#18
J Schetelig, L C de Wreede, M van Gelder, N S Andersen, C Moreno, A Vitek, M Karas, M Michallet, M Machaczka, M Gramatzki, D Beelen, J Finke, J Delgado, L Volin, J Passweg, P Dreger, A Henseler, A van Biezen, M Bornhäuser, S O Schönland, N Kröger
For young patients with high-risk CLL, BTK-/PI3K-inhibitors or allogeneic stem cell transplantation (alloHCT) are considered. Patients with a low risk of non-relapse mortality (NRM) but a high risk of failure of targeted therapy may benefit most from alloHCT. We performed Cox regression analyses to identify risk factors for 2-year NRM and 5-year event-free survival (using EFS as a surrogate for long-term disease control) in a large, updated EBMT registry cohort (n= 694). For the whole cohort, 2-year NRM was 28% and 5-year EFS 37%...
January 23, 2017: Bone Marrow Transplantation
https://www.readbyqxmd.com/read/28111464/bruton-s-tyrosine-kinase-inhibition-increases-bcl-2-dependence-and-enhances-sensitivity-to-venetoclax-in-chronic-lymphocytic-leukemia
#19
J Deng, E Isik, S M Fernandes, J R Brown, A Letai, M S Davids
Although the BTK inhibitor ibrutinib has transformed the management of patients with chronic lymphocytic leukemia (CLL), it does not induce substantial apoptosis in vitro, and as such the mechanisms underlying its ability to kill CLL cells are not well understood. Acalabrutinib, a more specific BTK inhibitor now in development, also appears to be highly effective in CLL, but the connection of its mechanism with CLL cell death is also unclear. Using dynamic BH3 profiling, we analyzed alterations in the function of the mitochondrial apoptotic pathway induced by ibrutinib and acalabrutinib...
February 14, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/28101242/screening-and-analysis-of-breast-cancer-genes-regulated-by-the-human-mammary-microenvironment-in-a-humanized-mouse-model
#20
Mingjie Zheng, Jue Wang, Lijun Ling, Dandan Xue, Shui Wang, Yi Zhao
Tumor microenvironments play critical regulatory roles in tumor growth. Although mouse cancer models have contributed to the understanding of human tumor biology, the effectiveness of mouse cancer models is limited by the inability of the models to accurately present humanized tumor microenvironments. Previously, a humanized breast cancer model in severe combined immunodeficiency mice was established, in which human breast cancer tissue was implanted subcutaneously, followed by injection of human breast cancer cells...
December 2016: Oncology Letters
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