1. Luspatercept improves hemoglobin levels and blood transfusion requirements in a study of patients with ß-thalassemia
- Author
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Piga, Antonio, Perrotta, Silverio, Gamberini, Maria Rita, Voskaridou, Ersi, Melpignano, Angela, Filosa, Aldo, Caruso, Vincenzo, Pietrangelo, Antonello, Longo, Filomena, Tartaglione, Immacolata, Borgna-Pignatti, Caterina, Zhang, Xiaosha, Laadem, Abderrahmane, Sherman, Matthew L., and Attie, Kenneth M.
- Abstract
ß-thalassemia is a hereditary disorder with limited approved treatment options; patients experience anemia and its complications, including iron overload. The study aim was to determine whether luspatercept could improve anemia and disease complications in patients with ß-thalassemia. This open-label, nonrandomized, uncontrolled study consisted of a 24-week dose-finding and expansion stage (initial stage) and a 5-year extension stage, currently ongoing. Sixty-four patients were enrolled; 33 were non–transfusion dependent (mean hemoglobin, <10.0 g/dL; <4 red blood cell [RBC] units transfused per 8 weeks), and 31 were transfusion dependent (=4 RBC units per 8 weeks). Patients received 0.2 to 1.25 mg/kg luspatercept subcutaneously every 21 days for =5 cycles (dose-finding stage) and 0.8 to 1.25 mg/kg (expansion cohort and 5-year extension). The primary end point was erythroid response, defined as hemoglobin increase of =1.5 g/dL from baseline for =14 consecutive days (without RBC transfusions) for non–transfusion-dependent patients or RBC transfusion burden reduction =20% over a 12-week period vs the 12 weeks before treatment for transfusion-dependent patients. Eighteen non–transfusion-dependent patients (58%) receiving higher dose levels of luspatercept (0.6-1.25 mg/kg) achieved mean hemoglobin increase =1.5 g/dL over =14 days vs baseline. Twenty-six (81%) transfusion-dependent patients achieved =20% reduction in RBC transfusion burden. The most common grade 1 to 2 adverse events were bone pain, headache, and myalgia. As of the cutoff, 33 patients remain on study. In this study, a high percentage of ß-thalassemia patients receiving luspatercept had hemoglobin or transfusion burden improvements. These findings support a randomized clinical trial to assess efficacy and safety. This study was registered at www.clinicaltrials.gov as #NCT01749540 and #NCT02268409.
- Published
- 2019
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