It is easy enough to kill cancer cells with large doses of radiation, but in most cases it is difficult to destroy the diseased cells without killing too many of the patient's healthy cells at the same time. And in leukemia, or "blood cancer," selective radiation has long seemed impossible because the target cells are diffused throughout the body.
Now, a promising solution to that formidable problem is being tested by medical-research teams at Brookhaven National Laboratory on Long Island and at the University of Washington in Seattle. The doctors insert two...
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