Biotech stocks have been struggling for more than two years. However, some companies with significant clinical and/or regulatory milestones have been able to overcome this trend and deliver impressive returns for investors.

In December, Bluebird Bio (NASDAQ: BLUE) and Structure Therapeutics (NASDAQ: GPCR) both have important events that could boost their stock prices in a big way. Here's what investors need to know right now.

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Source Fool.com