In preliminary research that's been dubbed "remarkable," "dramatic" and "sensational," doctors made the most common type of leukemia disappear in two patients, and reduced cancer cells by 70 percent in a third.
Researchers at the University of Pennsylvania transformed patients' own white blood cells into "serial killers" capable of annihilating cancer cells within the body. The two patients who experienced full recovery are still in remission more than a year later.
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