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Sarepta Therapeutics Announces Eteplirsen Demonstrates Continued Stability On Walking Test Through 120 Weeks In Phase IIb Study In Duchenne Muscular Dystrophy

Sarepta Therapeutics, Inc. (NASDAQ: SRPT), a developer of innovative RNA-based therapeutics, today announced data through Week 120 from Study 202, a Phase IIb open-label extension study of eteplirsen in patients with Duchenne muscular dystrophy (DMD). Results through more than two years showed a continued stabilization of walking ability in eteplirsen-treated patients evaluable on the 6-minute walk test (6MWT). As previously reported, Study 202 met its primary endpoint of increased novel dystrophin as assessed by muscle biopsy at Week 48 and is now in the long-term extension phase in which patients continue to be followed for safety and clinical outcomes.

At 120 weeks, patients in the 30 mg/kg and 50 mg/kg eteplirsen cohorts who were able to perform the 6MWT (modified Intent-to-Treat or mITT population; n=6) experienced a decline of 13.9 meters, or less than 5 percent, from baseline in walking ability. A statistically significant treatment benefit of 64.9 meters (p ≤0.006) was observed for the mITT population compared with the placebo/delayed-treatment cohort (n=4), which initiated treatment at Week 25 following 24 weeks of placebo. After experiencing a substantial decline earlier in the study, the placebo/delayed-treatment cohort also demonstrated stabilization in walking ability for more than 1.5 years, from Week 36 through 120, the period from which meaningful levels of dystrophin were likely produced, with a decline of 9.5 meters over this timeframe. These analyses were based on the maximum 6MWT score when the test was performed on two consecutive days.

“We now have more than two years of data with eteplirsen on the 6-minute walk test, the most accepted clinical outcome measure in Duchenne muscular dystrophy, which demonstrates walking stability that we believe would not be expected based on the natural history of this disease over the same time period,” said Chris Garabedian, president and chief executive officer of Sarepta Therapeutics. “We also now have over two years of safety data with eteplirsen with no treatment-related serious adverse events which is important when considering the need for lifelong treatment of this disease.”

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