The accumulating data led researchers at Zeneca Group, now AstraZeneca, to wonder whether blocking EGF receptors with a drug might slow tumor growth.

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Now, AstraZeneca (nyse: AZN - news - people ) is in late-stage testing for an experimental pill called Exanta that could eventually replace warfarin.

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Renovis and AstraZeneca now have a drug called Cerovive in final-stage trials.

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