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Cancer patient Alison Cairnes poses for a portrait at the University of California San Diego in San Diego, Calif., on Aug. 15, 2017. Doctors were just guessing a decade ago when they gave Cairnes' husband a new drug they hoped would shrink his lung tumors. Now she takes it too, but the choice was no guesswork. Sophisticated gene tests suggested it would fight her gastric cancer, and they were right. (AP Photo/Gregory Bull)

Cancer patient Alison Cairnes poses for a portrait at the University of California San Diego in San Diego, Calif., on Aug. 15, 2017. Doctors were just guessing a decade ago when they gave Cairnes' husband a new drug they hoped would shrink his lung tumors. Now she takes it too, but the choice was no guesswork. Sophisticated gene tests suggested it would fight her gastric cancer, and they were right. (AP Photo/Gregory Bull)

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