Except for the last several days, the past 12 months have been pretty good for stocks across the board and especially successful for Vertex Pharmaceuticals (NASDAQ: VRTX). Shares of the biotech stock surged by 42% during the 12 months ended Aug 5.

Now that it's already risen a great deal, investors are wondering if they've missed the boat on this stock.

Can Vertex Pharmaceuticals stock keep rising in the years ahead or is it too risky following a big run-up? Here's what you should know.

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Source Fool.com