Genetics or family history of breast cancer in a first-degree relative with breast cancer doubles a woman's risk. Having two first-degree relatives increases a woman's risk threefold. The personal history of a person who has had breast cancer is three to four times more likely to develop a new cancer. White women are slightly more likely to develop breast cancer than African American women, but African American women are more likely to die from this cancer. However, in women under 45, breast cancer is more common among African Americans