By Targeting Each Patient's Unique Tumor, Precision Medicine Is Crushing Once-Untreatable Cancers. But Only a Fraction of Patients Currently Benefit. Can Medicine Close the Gap?

The days when cancer patients received one-size-fits-all regimens of chemotherapy and radiation may soon be a thing of the past. Instead, doctors are taking a far more nuanced view of what drugs and treatments will work on which patients and on what different kinds of cancers. The idea of this so-called precision medicine, or personalized medicine, is that ultimately doctors will use genetic tests—of both the patient and the cancer tumor—to determine the exact drugs or treatments that have the best chance of working.

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