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      A Phase 3 Trial of Luspatercept in Patients with Transfusion-Dependent β-Thalassemia

      Author(s): 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1
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      Journal: New England Journal of Medicine
      Publisher: Massachusetts Medical Society

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          Abstract

          Patients with transfusion-dependent β-thalassemia need regular red-cell transfusions. Luspatercept, a recombinant fusion protein that binds to select transforming growth factor β superfamily ligands, may enhance erythroid maturation and reduce the transfusion burden (the total number of red-cell units transfused) in such patients.

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          Thalassaemia.

          Ali Taher, Maria Domenica Cappellini, David J. Weatherall (2017)
          Inherited haemoglobin disorders, including thalassaemia and sickle-cell disease, are the most common monogenic diseases worldwide. Several clinical forms of α-thalassaemia and β-thalassaemia, including the co-inheritance of β-thalassaemia with haemoglobin E resulting in haemoglobin E/β-thalassaemia, have been described. The disease hallmarks include imbalance in the α/β-globin chain ratio, ineffective erythropoiesis, chronic haemolytic anaemia, compensatory haemopoietic expansion, hypercoagulability, and increased intestinal iron absorption. The complications of iron overload, arising from transfusions that represent the basis of disease management in most patients with severe thalassaemia, might further complicate the clinical phenotype. These pathophysiological mechanisms lead to an array of clinical manifestations involving numerous organ systems. Conventional management primarily relies on transfusion and iron-chelation therapy, as well as splenectomy in specific cases. An increased understanding of the molecular and pathogenic factors that govern the disease process have suggested routes for the development of new therapeutic approaches that address the underlying chain imbalance, ineffective erythropoiesis, and iron dysregulation, with several agents being evaluated in preclinical models and clinical trials.
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            Transforming growth factor-β superfamily ligand trap ACE-536 corrects anemia by promoting late-stage erythropoiesis.

            Rajasekhar Suragani, Samuel M Cadena, Sharon Cawley … (2014)
            Erythropoietin (EPO) stimulates proliferation of early-stage erythrocyte precursors and is widely used for the treatment of chronic anemia. However, several types of EPO-resistant anemia are characterized by defects in late-stage erythropoiesis, which is EPO independent. Here we investigated regulation of erythropoiesis using a ligand-trapping fusion protein (ACE-536) containing the extracellular domain of human activin receptor type IIB (ActRIIB) modified to reduce activin binding. ACE-536, or its mouse version RAP-536, produced rapid and robust increases in erythrocyte numbers in multiple species under basal conditions and reduced or prevented anemia in murine models. Unlike EPO, RAP-536 promoted maturation of late-stage erythroid precursors in vivo. Cotreatment with ACE-536 and EPO produced a synergistic erythropoietic response. ACE-536 bound growth differentiation factor-11 (GDF11) and potently inhibited GDF11-mediated Smad2/3 signaling. GDF11 inhibited erythroid maturation in mice in vivo and ex vivo. Expression of GDF11 and ActRIIB in erythroid precursors decreased progressively with maturation, suggesting an inhibitory role for GDF11 in late-stage erythroid differentiation. RAP-536 treatment also reduced Smad2/3 activation, anemia, erythroid hyperplasia and ineffective erythropoiesis in a mouse model of myelodysplastic syndromes (MDS). These findings implicate transforming growth factor-β (TGF-β) superfamily signaling in erythroid maturation and identify ACE-536 as a new potential treatment for anemia, including that caused by ineffective erythropoiesis.
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              Global epidemiology of haemoglobin disorders and derived service indicators

              Bernadette Modell, Matthew Darlison (2008)
              To demonstrate a method for using genetic epidemiological data to assess the needs for equitable and cost-effective services for the treatment and prevention of haemoglobin disorders. We obtained data on demographics and prevalence of gene variants responsible for haemoglobin disorders from online databases, reference resources, and published articles. A global epidemiological database for haemoglobin disorders by country was established, including five practical service indicators to express the needs for care (indicator 1) and prevention (indicators 2-5). Haemoglobin disorders present a significant health problem in 71% of 229 countries, and these 71% of countries include 89% of all births worldwide. Over 330 000 affected infants are born annually (83% sickle cell disorders, 17% thalassaemias). Haemoglobin disorders account for about 3.4% of deaths in children less than 5 years of age. Globally, around 7% of pregnant women carry b or a zero thalassaemia, or haemoglobin S, C, D Punjab or E, and over 1% of couples are at risk. Carriers and at-risk couples should be informed of their risk and the options for reducing it. Screening for haemoglobin disorders should form part of basic health services in most countries.
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                Author and article information

                Journal
                Title: New England Journal of Medicine
                Abbreviated Title: N Engl J Med
                Publisher: Massachusetts Medical Society
                ISSN (Print): 0028-4793
                ISSN (Electronic): 1533-4406
                Publication date Created: March 26 2020
                Publication date (Print): March 26 2020
                Volume: 382
                Issue: 13
                Pages: 1219-1231
                Affiliations
                [1 ]From the Department of Clinical Sciences and Community, University of Milan, IRCCS Ca’ Granda Foundation Maggiore Policlinico Hospital, Milan (M.D.C.), Centro della Microcitemia e Anemie Congenite e del Dismetabolismo del Ferro, E.O. Ospedali Galliera, Genoa (G.L.F.), Ospedale Pediatrico Microcitemico A. Cao, Azienda Ospedaliera G. Brotzu, Cagliari (R.O.), Ematologia e Oncologia Pediatrica, Università della Campania L. Vanvitelli, Caserta (S.P.), and the Department of Clinical and Biological Sciences,...
                Article
                DOI: 10.1056/NEJMoa1910182
                PubMed ID: 32212518
                SO-VID: 4d571bfc-9c60-485e-b5b3-c370aa9f5222
                Copyright © © 2020
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                http://www.nejmgroup.org/legal/terms-of-use.htm

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