In the following video, David Williamson highlights the game-changing trial results that sent shares of Vertex Pharmaceuticals soaring 55% in a single day. Known for its blockbuster hepatitis C franchise Incivek, Vertex may have another megahit on its hands as it expands the use of cystic fibrosis treatment Kalydeco. For a closer look at Vertex and what investors should make of the market's reaction, watch the video and Fool on.

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David Williamson holds no position in any company mentioned. Click here to see his holdings and a short bio. Motley Fool newsletter services have recommended buying shares of Gilead Sciences and Vertex Pharmaceuticals. The Motley Fool has a disclosure policy. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. Try any of our Foolish newsletter services free for 30 days.