In this May 31, 2013, photo, breast cancer survivor Alicia Cook holds a letter from the University of Chicago informing her that test results showed she had the BRCA genetic defect linked to breast cancer, outside her home in Chicago. New research shows genetic breast cancer is more common in black women than previously thought. (AP Photo/M. Spencer Green)

Associated Press
In this May 31, 2013, photo, breast cancer survivor Alicia Cook holds a letter from the University of Chicago informing her that test results showed she had the BRCA genetic defect linked to breast cancer, outside her home in Chicago. New research shows genetic breast cancer is more common in black women than previously thought. (AP Photo/M. Spencer Green)
In this May 31, 2013, photo, breast cancer survivor Alicia Cook holds a letter from the University of Chicago informing her that test results showed she had the BRCA genetic defect linked to breast cancer, outside her home in Chicago. New research shows genetic breast cancer is more common in black women than previously thought. (AP Photo/M. Spencer Green)
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