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Spark Therapeutics and Pfizer Inc. announced that the U.S. Food and Drug Administration (FDA) has granted breakthrough therapy designation to SPK-9001, the lead investigational candidate in the companies' SPK-FIX program, in development for the treatment of hemophilia B. SPK-9001, a novel bio-engineered adeno-associated virus (AAV) capsid expressing a codon-optimized, high-activity human factor IX variant, is being investigated in an ongoing Phase 1/2 trial as a potential one-time therapy.