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 Alnylam Pharmaceuticals , a biopharmaceutical company developing treatments based on RNA interference, vaulted 19% higher after the company announced positive top-line data for ALN-TTRsc.

So what: In early-stage trials, initial data showed that a subcutaneous treatment targeting TTR-mediated amyloidosis achieved statistical significant results by knocking down serum TTR levels in patients by greater than 80%. The true excitement comes from the quickness of subcutaneous injection as compared to intravenous injection, and the fact that most patients are more willing to get medication subcutaneously than through an IV. Alnylam anticipates beginning a phase 2 trial for ALN-TTRsc later this year and, if all goes well, initiate a phase 3 trial sometime next year.


Now what: Both of Alnylam's TTR-mediated amyloidosis drugs have shown considerable promise in trials -- ALN-TTR02, an intravenous application to treat familial amyloidotic polyneuropathy (FAP), and ALN-TTRsc for familial amyloidotic cardiomyopathy (FAC). There are four times as many cases of FAC worldwide, so it's not hard to understand why investors are excited about this early stage news. As for me, I still remain skeptical of Alnylam's valuation at these levels. My suggestion would be to watch Alnylam closely, but do it from a safe distance!

It's no secret that biotech stocks like Alnylam Pharmaceuticals have been soaring recently, but the best investment strategy is to pick great companies and stick with them for the long term. The Motley Fool's free report "3 Stocks That Will Help You Retire Rich" not only shares stocks that could help you build long-term wealth, but also winning strategies that every investor should know. Click here to grab your free copy today.

The article Why Alnylam Pharmaceuticals Shares Soared originally appeared on Fool.com.

Fool contributor 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. Try any of our Foolish newsletter services free for 30 days. We Fools may not 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.

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