Clinical trial results expected in the weeks ahead could push shares of these small-cap drugmakers through the roof.

For decades, savvy investors have been finding stocks that can produce dramatic gains in relatively short timeframes by sifting through the biotechnology universe. In this wonky industry, positive clinical trial results can cause small-cap stocks to double in value in a single trading session.

At the moment, aTyr Pharma ( LIFE -0.39% ) , and MoonLake Immunotherapeutics ( MLTX -0.24% ) are running clinical trials that could lead to big gains for their stock prices, depending on the results.

1. aTyr Pharma

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