As of data cutoff, the annualized bleeding rate (ABR) has been reduced by 96 percent and the annualized infusion rate (AIR) reduced by 99 percent
Both participants who began a tapering course of steroids have completed their regimen
Data as of
As of the data cutoff, nine of the 10 infused participants have not taken factor IX concentrates to prevent or control bleeding events since vector administration. As previously reported, one participant with severe joint disease has self-administered precautionary infusions for persistent knee pain. The mean steady-state factor IX activity level post 12 weeks treatment for the 10 participants was a sustained 33 percent (range as of the data cutoff: 14 to 81 percent). In the study to date, no serious adverse events have been reported, including no factor IX inhibitors and no thrombotic events. These data represent more than 2,400 cumulative patient days of exposure from the start of the trial.
Two of the 10 participants experienced an asymptomatic, transient elevation in liver enzymes, or decline in FIX activity, potentially indicative of an immune response to the Spark100 vector capsid, that occurred several weeks post infusion. Both participants received a tapering dose of oral corticosteroids, after which their alanine aminotransferase (ALT) levels returned to baseline. The activity level of one of these participants has stabilized at approximately 15 percent for more than nine weeks post corticosteroid use. The other participant had a factor IX activity level between 70 to 80 percent at completion of steroid use.
“The additional preliminary data continue to support our initial observations that a single intravenous administration of SPK-9001 has resulted in consistent and sustained levels of factor IX activity for trial participants,” said Katherine A. High, M.D., president and chief scientific officer at
These data from the Phase 1/2 clinical trial of SPK-9001 will be presented during a poster session on
About Hemophilia B
Hemophilia, a rare genetic bleeding disorder that causes the blood to take a long time to clot because of a deficiency in one of several blood clotting factors, is almost exclusively found in males. People with hemophilia are at risk for excessive and recurrent bleeding from modest injuries, which have the potential to be life threatening. People with severe hemophilia often bleed spontaneously into their muscles or joints. The incidence of hemophilia B is one in 25,000 male births. People with hemophilia B have a deficiency in clotting factor IX, a specific protein in the blood. Hemophilia B also is called congenital factor IX deficiency or Christmas disease. The current standard of care requires recurrent intravenous infusions of either plasma-derived or recombinant factor IX to control and prevent bleeding episodes. There exists a significant need for novel therapeutics to treat people living with hemophilia.
About the SPK-FIX Program and SPK-9001
About Spark Therapeutics
Spark Cautionary Note on Forward-looking Statements
This release contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995, including statements regarding the company's SPK-FIX program. Any forward-looking statements are based on management's current expectations of future events and are subject to a number of risks and uncertainties that could cause actual results to differ materially and adversely from those set forth in, or implied by, such forward-looking statements. These risks and uncertainties include, but are not limited to, the risk that: (i) our lead SPK-FIX product candidate, SPK-9001, may not produce sufficient data in our Phase 1/2 clinical trial to warrant further development; and (ii) our overall collaboration with Pfizer may not be successful. For a discussion of other risks and uncertainties, and other important factors, any of which could cause our actual results to differ from those contained in the forward-looking statements, see the "Risk Factors" section, as well as discussions of potential risks, uncertainties and other important factors, in our Annual Report on Form 10-K, our Quarterly Reports on Form 10-Q and other filings we make with the
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