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Toll like receptor 2 (TLR2) signaling promotes apoptosis of premalignant hematopoietic stem and progenitor cells in a mouse model of myelodysplastic syndrome

The myelodysplastic syndromes (MDS) are hematopoietic stem cell (HSC) disorders characterized by ineffective hematopoiesis and a high risk of leukemic transformation. The only curative treatment is stem cell transplantation; thus new therapies are needed. Multiple studies have shown a correlation between MDS and enhanced toll like receptor 2 (TLR2) signaling, suggesting this might contribute to disease pathogenesis. In fact, an inhibitory TLR2 antibody is currently in clinical trial for use in MDS (OPN-305, Opsona Therapeutics).
Source: Experimental Hematology - Category: Hematology Authors: Source Type: research

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Abstract Despite the curative potential of allogeneic stem cell transplantation (allo-SCT) in patients with acute myeloid leukemia (AML) and myelodysplastic syndromes (MDS), many patients will relapse. Until recently therapeutic options mainly consisted of palliative care, chemotherapy, donor lymphocyte infusions and second transplantation in selected cases. Still many patients either do not tolerate intensive therapies or do not achieve durable remissions and will finally succumb. Given this unmet medical need the hypomethylating agents (HMA), Azacitidine (Aza) and Decitabine (DAC) have been tested as salvage the...
Source: International Journal of Hematology - Category: Hematology Authors: Tags: Int J Hematol Source Type: research
Publication date: Available online 9 November 2017 Source:Seminars in Cancer Biology Author(s): Christian Flotho, Sebastian Sommer, Michael Lübbert Myelodysplastic syndrome (MDS) is a clonal bone marrow disorder, typically of older adults, which is characterized by ineffective hematopoiesis, peripheral blood cytopenias and risk of progression to acute myeloid leukemia. Juvenile myelomonocytic leukemia (JMML) is an aggressive myeloproliferative neoplasm occurring in young children. The common denominator of these malignant myeloid disorders is the limited benefit of conventional chemotherapy and a particular responsiv...
Source: Seminars in Cancer Biology - Category: Cancer & Oncology Source Type: research
M, Arnold R, De Witte T, Robin M, Kröger N Abstract No standard exists for the treatment of myelodysplastic syndrome relapsing after allogeneic stem cell transplantation. We performed a retrospective registry analysis of outcome and risk factors in 698 patients, treated with different strategies. Median overall survival from relapse was 4.7 months (4.1-5.3), 2-year survival was 17.7% (14.8-21.2%). Shorter remission after transplantation (p
Source: Haematologica - Category: Hematology Authors: Tags: Haematologica Source Type: research
Conclusions: This first-in-pediatric trial of epigenetic priming in patients with newly diagnosed AML demonstrates that decitabine pre-treatment followed by standard combination chemotherapy is well tolerated in children with newly diagnosed AML. Morphologic complete responses were similar in both treatment arms. MRD at Day 30 following induction therapy suggests a deeper remission in patients receiving decitabine. No differences were observed between treatment arms in hematologic toxicities although decitabine-treated patients were noted to have more gastrointestinal toxicities, anorexia and hypophosphatemia. Decitabine P...
Source: GEO: Gene Expression Omnibus - Category: Genetics & Stem Cells Tags: Methylation profiling by array Homo sapiens Source Type: research
Summary A disease risk index (DRI) has been defined for stratifying heterogeneous cohorts of patients undergoing allogeneic haematopoietic stem cell transplantation (HSCT). This index defines 4 distinct groups with different outcomes, dividing patients by disease type and status and considering cytogenetics for acute myeloid leukaemia and myelodysplastic syndromes (MDS). Recently, the DRI has been refined to include rare diseases and improve MDS stratification by blast percentage and response to prior therapy. Previous reports on DRI include only a small number of UCBT recipients. The current study aims to determine the ap...
Source: British Journal of Haematology - Category: Hematology Authors: Tags: Research Paper Source Type: research
AbstractChronic myelomonocytic leukemia (CMML) is a myeloid malignancy which shares clinical and morphologic features of myelodysplastic syndromes (MDS) and myeloproliferative neoplasms (MPNs) and is classified by the WHO as an MDS/MPN. The defining feature of CMML is clonal hematopoiesis that results in peripheral monocytosis. The benefit of early treatment is currently unclear, and treatment may be held until the disease exhibits accelerated blast counts or the patient becomes symptomatic. Optimal treatments for CMML are not well defined. Conventional treatments include hydroxyurea, cytarabine, and hypomethylating agents...
Source: Current Hematologic Malignancy Reports - Category: Hematology Source Type: research
Secondary myelodysplastic syndrome (MDS)/acute myeloid leukemia (AML) is a rare but devastating complication of solid tumor treatment involving high-dose topoisomerase II inhibitor and alkylator chemotherapy. For relapsed or elderly MDS and AML patients ineligible for hematopoietic stem cell transplantation, epigenetic therapies, including DNA methyltransferase inhibitors and histone deacetylase inhibitors, have been utilized as palliative therapy, offering a well-tolerated approach to disease stabilization, prolonged survival, and quality of life. Literature on the use of epigenetic therapies for both primary and relapsed...
Source: Journal of Pediatric Hematology Oncology - Category: Hematology Tags: Original Articles Source Type: research
Allogeneic stem cell transplant (ASCT) with HLA matched donors is increasingly used for older patients with AML/MDS. It remains unclear if haploidentical transplantation (haploSCT) is a suitable option for older patients with this disease. We analyzed 43 patients with AML/MDS (median age 61 years) who underwent a haploSCT at our institution. All the patients received a fludarabine-melphalan-based reduced-intensity conditioning regimen and post-transplant cyclophosphamide-based GVHD prophylaxis. Except one patient who had early death, the remaining 42 patients (98%) engrafted donor cells.
Source: Biology of Blood and Marrow Transplantation - Category: Hematology Authors: Source Type: research
Bone Marrow Transplantation, Published online: 11 September 2017; doi:10.1038/bmt.2017.171
Source: Bone Marrow Transplantation - Category: Hematology Authors: Source Type: research
Validation of the revised IPSS at transplant in patients with myelodysplastic syndrome/transformed acute myelogenous leukemia receiving allogeneic stem cell transplantation: a retrospective analysis of the EBMT chronic malignancies working party Bone Marrow Transplantation advance online publication, September 11 2017. doi:10.1038/bmt.2017.171 Authors: C Scheid, L de Wreede, A van Biezen, C Koenecke, G Göhring, L Volin, J Maertens, J Finke, J Passweg, D Beelen, J J Cornelissen, M Itälä-Remes, P Chevallier, N Russell, E Petersen, N Milpied, C Richard Espiga, A Peniket, J Sierra, G Mufti, C Crawley, J H Ve...
Source: Bone Marrow Transplantation - Category: Hematology Authors: Source Type: research
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