Results from ongoing study demonstrate increases in hemoglobin and decreases in red blood cell transfusion burden sustained for up to 24 months, with patients still active on treatment
"With beta-thalassemia patients now remaining on study for over two
years, we continue to be highly encouraged by luspatercept's long-term
efficacy results and safety profile," said
Phase 2 Results
A total of 32 transfusion-dependent beta-thalassemia patients have been treated with therapeutic dose levels of luspatercept in the ongoing study.
A 12-week fixed interval analysis was conducted to review RBC transfusion reduction during weeks 13 to 24 and weeks 37 to 48 compared to the baseline 12-week period pre-treatment in order to evaluate durability of response. The ongoing BELIEVE Phase 3 trial will use this 12-week fixed interval analysis for evaluating the proportion of patients achieving at least a 33% reduction in RBC transfusion burden.
A total of 31 non-transfusion-dependent beta-thalassemia patients have been treated with therapeutic dose levels of luspatercept in the ongoing study.
There are patients who remain on luspatercept with clinically meaningful increases in hemoglobin and reductions in RBC transfusion burden for up to 24 months.
Phase 2 Safety Summary
A total of 64 beta-thalassemia patients have been treated with luspatercept in the ongoing Phase 2 studies (all dose levels).
"Beta-thalassemia remains an area of critical medical need for many
patients around the world," said
Luspatercept is an investigational product that is not approved for use in any country.
The BELIEVE trial, a global Phase 3 study of luspatercept in transfusion-dependent beta-thalassemia patients, is fully enrolled and top-line results are expected in mid-2018.
The EHA beta-thalassemia presentation is available under the Science page of the Company's website at www.acceleronpharma.com/.
About the Phase 2 Study
Data from two open-label Phase 2 studies were presented at the conference: the base study in which patients received treatment with luspatercept for three months and the ongoing long-term safety extension study in which patients may receive treatment with luspatercept for up to an additional five years. In both the three-month base study and the long-term extension study, red blood cell (RBC) transfusion-dependent patients (≥ 4 units RBC / 8 weeks) and non-transfusion-dependent patients ( < 4 units RBC / 8 weeks) were enrolled and treated with open-label luspatercept, dosed subcutaneously once every three weeks.
The primary outcome measure of the three-month base study was the proportion of patients who have an erythroid response, defined as 1) a hemoglobin increase of ≥ 1.5 g/dL from baseline for ≥ 14 days (in the absence of RBC transfusions) in non-transfusion dependent patients, or 2) ≥ 20% reduction in RBC transfusion burden compared to pretreatment in transfusion-dependent patients. The primary outcome for the long-term extension study is to evaluate the long-term safety and tolerability of luspatercept.
Luspatercept is a modified activin receptor type IIB fusion protein that acts as a ligand trap for members in the transforming growth factor-beta superfamily involved in the late stages of erythropoiesis (red blood cell production). Luspatercept regulates late-stage erythrocyte (red blood cell) precursor cell differentiation and maturation. This mechanism of action is distinct from that of erythropoiesis stimulating agents (ESAs), which stimulate the proliferation of early-stage erythrocyte precursor cells. Acceleron and Celgene are jointly developing luspatercept as part of a global collaboration. Phase 3 clinical trials are underway to evaluate the safety and efficacy of luspatercept in patients with myelodysplastic syndromes (the "MEDALIST" study) and in patients with beta-thalassemia (the "BELIEVE" study). For more information, please visit www.clinicaltrials.gov.
Acceleron is a clinical stage biopharmaceutical company focused on the discovery, development and commercialization of innovative therapeutics to treat serious and rare diseases. Its pioneering research platform leverages the powerful biology behind the body's ability to rebuild and repair its own cells and tissues. This approach to drug discovery has generated four therapeutic candidates that are currently in clinical trials. The Company's lead therapeutic candidate, luspatercept, is being evaluated in Phase 3 studies for the treatment of the hematologic diseases myelodysplastic syndromes (MDS) and beta-thalassemia under a global partnership with Celgene. Acceleron is also advancing its ACE-083 clinical program in the field of neuromuscular disease, and has a comprehensive preclinical research effort targeting fibrotic and other serious diseases.
Cautionary Note on Forward-Looking Statements
This press release contains forward-looking statements about Acceleron's strategy, future plans and prospects, including statements regarding the development of luspatercept, the timeline for clinical development and regulatory approval of Acceleron's compounds, the expected timing for the reporting of data from ongoing trials, and the structure of Acceleron's planned or pending clinical trials. The words "anticipate," "appear," "believe," "continue," "could," "estimate," "expect," "forecast," "goal," "intend," "may," "plan," "potential," "predict," "project," "should," "target," "will," "would," and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words.
Each forward-looking statement is subject to risks and uncertainties that could cause actual results to differ materially from those expressed or implied in such statement. Applicable risks and uncertainties include the risks that preclinical testing of Acceleron's compounds and data from clinical trials may not be predictive of the results or success of ongoing or later clinical trials, that data may not be available when Acceleron expects it to be, that Acceleron or its collaboration partner, Celgene, will be unable to successfully complete the clinical development of Acceleron's compounds, that the development of Acceleron's compounds will take longer or cost more than planned, that Acceleron or Celgene may be delayed in initiating or completing any clinical trials, and that Acceleron's compounds will not receive regulatory approval or become commercially successful products.
Other risks and uncertainties include those identified under the heading
"Risk Factors" included in Acceleron's Annual Report on Form 10-K which
was filed with the
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