Nearly all patients treated with a one-time gene therapy shot for hemophilia B (HB) were able to discontinue full-dose bleeding prophylaxis, a new industry-funded phase 3 study finds, and annual bleed rates (ABR) fell by 64% after the lead-in period.
The report on the gene therapy treatment, known as etranacogene dezaparvovec (EtranaDez), was released at the Feb. 2-4, 2022, annual meeting of the European Association of Hemophilia and Allied Disorders.
In an interview, study lead author Wolfgang Miesbach, MD, PhD, of University Hospital Frankfurt in Germany, touted the decline in ABR. "This statistically significant reduction not only met the primary endpoint for non-inferiority but also demonstrates clear superiority of etranacogene dezaparvovec to prophylaxis in the lead-in period," he said. "In addition to that, the quality of life improved significantly, [and] there was an overall favorable safety profile."
Hemophilia B is much rarer than hemophilia A. In a 2020 report, the CDC estimated that type A accounted for less than a quarter of the 29,761-32,985 cases of U.S. males who had hemophilia from 2012-2018. The rest had type B. Most of the males with hemophilia were white (81.2%) and fairly young (just 20.6% were older than 39).
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