Sarepta Therapeutics has a new drug in the works that could revolutionize treatment for Duchenne muscular dystrophy. This disease, characterized by a progressive weakening of the muscles, has a dismally low survival rate -- many who are afflicted live only into their teens. Results from a 36-week trial have produced promising data showing a meaningful decline in disease progression, and investors are anxiously awaiting 48-week data to be released in coming days.

As a result, the stock has gone on a huge run, with shares more than tripling since early July. This could easily be a $500 million drug in the U.S., and GlaxoSmithKline is close on Sarepta's heels developing a treatment of its own. Sarepta is the one to watch in this space, particularly as the Oct. 9 meeting of the World Muscle Society draws closer. Check out the video below to learn more.

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