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There's a new sheriff in town in Silicon Valley: the FDA

Regulators raising questions about startups' products, suspecting they're promising more than they can deliver

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Founder and CEO Helmy Eltoukhy (left, with chief technology officer AmirAli Talasaz) says Guardant Health is a leading contender among firms working on "liquid biopsy" tests for cancers.

San Francisco

HELMY Eltoukhy's company is on a roll. The startup is a leading contender in the crowded field of firms working on "liquid biopsy" tests that aim to be able to tell in a single blood draw whether a person has cancer.

Venture investors are backing Guardant Health to