Sarepta Therapeutics Inc (SRPT), VIVUS, Inc. (VVUS): The Week’s Biotech Winner and Loser

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What’s the best way to choose the biotech winner and loser of the past week?

The easiest route would involve the companies with the biggest share price movements. That would make Idenix Pharmaceuticals Inc (NASDAQ:IDIX) the obvious loser with its over 30% drop after the FDA requested additional preclinical safety information for a hepatitis C drug. But that movement came from volatility that arose despite the fact that this wasn’t the first time Idenix Pharmaceuticals Inc (NASDAQ:IDIX) has faced a similar delay.

But there were two companies last week that moved over 4% on the days of their news. And the stories of Sarepta Therapeutics Inc (NASDAQ:SRPT) and VIVUS, Inc. (NASDAQ:VVUS) displayed the overall industry pattern much better.

Winner: Sarepta

Sarepta Therapeutics Inc

Sarepta Therapeutics Inc (NASDAQ:SRPT) shares have soared over 800% in the past year thanks solely to the Duchenne muscular dystrophy drug eteplirsen. DMD is a degenerative X-linked muscle disease that usually leaves the young male patients wheelchair-bound. The life expectancy is under 30.

Eteplirsen’s new data comes from a phase 2b extension study that was testing the drug against placebo using the six-minute walk, an important DMD metric. Trial patients would walk for six minutes and have the distance measured over the course of 84 weeks. Boys taking eteplirsen showed an improvement of 46.4 meters over the placebo arm. The boys also showed a relatively stable overall decline in walking distance.

Sarepta Therapeutics Inc (NASDAQ:SRPT) is overly dependent on eteplirsen’s success. But the efficacy data continues to impress and the safety profile hasn’t thrown up any warning signs. An FDA approval would serve a disease that currently has no real treatment options, and cement Sarepta Therapeutics Inc (NASDAQ:SRPT)’s developer reputation at the same time.

Loser: Vivus

VIVUS, Inc. (NASDAQ:VVUS) was a news darling last year before the launch of its obesity drug Qysmia, which limped slowly out of the gate. But the company also has the erectile dysfunction drug Stendra.

VIVUS, Inc. (NASDAQ:VVUS) reported results from a placebo-controlled study indicating that Stendra is effective within 15 minutes. The results were meant to inspire a label addition to the product, which was previously approved with a 30 minute dosage note.

Fifteen minutes is an improvement on the hour recommended for Pfizer Inc. (NYSE:PFE)’s Viagra, but there are already once-daily ED drugs available that don’t require pre-game prep time. And there’s also the pesky fact that Stendra still hasn’t launched, despite receiving FDA approval last spring and a CHMP recommendation earlier this year. That’s because VIVUS, Inc. (NASDAQ:VVUS) is hoping for a big pharma partner to  help push Stendra out into a saturated market.

But the delay could cost Stendra a shot at even a slice of that market. ED drugs will soon begin dropping off the patent cliff like lemmings. Viagra went off-patent in Europe last week, though it has a few more years of protection in the United States. ED drugs are notoriously costly and branded drugs won’t stand up against a wave of cheaper generics.

Foolish final thoughts

Sarepta Therapeutics Inc (NASDAQ:SRPT)’s share price skyrocket over the past year isn’t sustainable. But eteplirsen continues to show fantastic data in an area of unmet need, which could lead to an approval and higher pricing to counteract the low patient population.

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