The surgery looked like any other operation to remove a tumor. When doctors turned off the lights, however, parts of the patient's chest started to glow. A spot over his heart shined purplish-pink. Another spot lit up in his lung.Doctors at the Hospital of the University of Pennsylvania were using dyes that glow in the dark to help find cancer.Dr. Sunil Singhal at the Philadelphia hospital told the Associated Press that using glowing dyes is a big aid during surgery."We can be sure we're not taking too much [tissue] or too little," he said.The new dyes are experimental. There are several long-term studies that are aimed at getting the approval of the Food and Drug Administration.The drug company Johnson & Johnson recently invested $40 million in a method that uses one of the dyes. Money from the federal government also has supported some of the work.Paula Jacobs, an imaging
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