Please ensure Javascript is enabled for purposes of website accessibility

Why Sarepta Therapeutics Inc. Stock Collapsed

By Sean Williams – Jul 10, 2014 at 2:09PM

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More

Sarepta shares dive following the release of long-term data on eteplirsen. Find out what two factors contributed to this tumble and what they might mean for investors.

Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Sarepta Therapeutics (SRPT -0.56%), a clinical-stage biopharmaceutical company primarily focused on developing therapies to treat Duchenne muscular dystrophy (DMD), tumbled as much as 28% after the company reported fresh data at the 144-week mark for its phase 2b long-term study involving eteplirsen for DMD.

So what: Two factors are playing into today's monstrous stumble in Sarepta shares. First, the data showed that patients treated with eteplirsen experienced an average decline in walking ability (based on the six-minute-walk-test (6MWT) of 33.2 meters from baseline. By comparison, a statistically significant benefit of 75.1 meters was observed relative to the placebo group. Despite the statistical significance, this was a marked drop-off from the 13.9 meter decline noted at the 120-week mark in January. Even though the benefit between eteplirsen and the placebo grew wider (which would be construed as a good thing), the more than 19-meter decline in a 24-week assessment period could place a cap on eteplirsen's benefit period.

Secondly, an article published, and since corrected, by The Wall Street Journal implied that Sarepta would delay the filing of its new drug application based on today's data. This actually wasn't the case as Sarepta's press release notes that it remains on track to file its NDA before the year is out and will use this additional phase 2b data from the 144 week mark as further evidence to eteplirsen's efficacy.

Now what: It's not hard to understand why investors have been so hypercritical of Sarepta considering the failure of Prosensa's drisapersen in a previous phase 3 study after it performed so well in a prior phase 2 study. This big concern from today's data is merely whether or not there's a time benefit limit for eteplirsen. Either way it would appear that investors are generally overreacting to today's news as the data thus far has demonstrated a statistically significant benefit to placebo with a favorable risk profile. Of course, that doesn't mean eteplirsen will be approved by the Food and Drug Administration, which has expressed skepticism that increased dystrophin production can be a viable efficacy endpoint. Still, I remain slightly more optimistic than pessimistic at the moment and expect Sarepta to file its NDA before the end of the year.

Sean Williams has no material interest in any companies mentioned in this article. You can follow him on CAPS under the screen name TMFUltraLong, track every pick he makes under the screen name TrackUltraLong, and check him out on Twitter, where he goes by the handle @TMFUltraLong.

The Motley Fool has no position in any of the stocks mentioned. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.

Premium Investing Services

Invest better with The Motley Fool. Get stock recommendations, portfolio guidance, and more from The Motley Fool's premium services.