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Even for a digital publication that can publish in real time, trying to write about yo-yoing biotech stocks is nearly impossible. There’s just too much volatility. On Wednesday, the XBI biotech index plunged 7 percent. Thursday, the same index is rebounding 4 percent.

October has been bad for biotech stocks. So bad that the XBI is now negative for the year. We don’t know how stocks will behave for the rest of 2018, but we can step back and try to place this Biotech Pumpkin Melt into a broader context — pros and cons.

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