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Walgreens was Theranos' largest revenue source. It cited problems that federal regulators have had with Theranos' lab testing in deciding to end the relationship.
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One year after Elizabeth Holmes topped the magazine's list of the wealthiest self-made women with a worth of $4.5 billion, Forbes now values her fortune at "nothing."
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It's legal to order diagnostic blood tests without consulting a doctor in many states. But critics say healthy patients can go down a rabbit hole of invasive assays and unnecessary treatments.
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The blood-testing startup led by Elizabeth Holmes soared on hype and celebrity boosters. Now it's under federal scrutiny. It could show that Silicon Valley's success model doesn't work in biotech.