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Associated Press
FILE - This undated file image provided in 2007 by the Duke University Department of Medicine shows a right breast MRI from a 55-year-old woman with extreme breast density. The superimposed arrow points to a 2 cm rapidly enhancing lesion which was later confirmed by biopsy to be invasive breast cancer. Doctors have successfully dropped the first "smart bomb" on breast cancer, using a drug to deliver a toxic payload to tumor cells while leaving healthy ones alone, doctors plan to report Sunday, June 3, 2012. (AP Photo/Duke University Department of Medicine, File)

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