Doctors hunt for hidden cancers with glowing dyes
(World News Science)

PHILADELPHIA (AP) - It was an ordinary surgery to remove a tumor - until doctors turned off the lights and the patient`s chest started to glow. A spot over his heart shined purplish pink. Another shimmered in a lung. They were hidden cancers revealed by fluorescent dye, an advance that soon may transform how hundreds of thousands of operations are done each year. Surgery has long been the best way to cure cancer. If the disease recurs, it`s usually because stray tumor cells were left behind or others lurked undetected. Yet there`s no good way for surgeons to tell what is cancer and what is not. They look and feel for defects, but good and bad tissue often seem the same. ......