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Pfizer said Thursday that its experimental gene therapy for hemophilia B significantly reduced the number of bleeds patients experienced over a year. 

Data from the 45-patient trial could set the stage for a second gene therapy to be approved for patients with the rare and serious bleeding disorder in as many years. In November, UniQure won approval for Hemgenix, the first hemophilia B gene therapy. 


“The results from this long-awaited study are great news for hemophilia B patients that soon may have access to a second durable treatment option,” Luk Vandenberghe, a gene therapy expert at Harvard, said in a text message, after reviewing the results. 

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