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Alexion Pharmaceuticals(NASDAQ: ALXN) stock has been on a big roll over the last few months. However, it hasn't been enough to outperform the S&P 500 index -- and Alexion's shares are still in negative territory year to date.
But Alexion provided good news to investors with its second-quarter results announced before the market opened on Thursday. Here are the highlights from the Q2 update.