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According to scientists at the University of Pennsylvania, they've genetically engineered a type of white blood cells to attack cancer cells in advanced cases of leukemia.

Scientists who were not involved in the trial celebrated the results:  Dr. Lee Nadler, dean for clinical and translational research at Harvard Medical School, said, "This is a huge accomplishment.  Huge!"

Here's more: 
http://www.latimes.com/health/la-he-0811-cancer-therapy-20110811,0,1073777.story