Relative Risk of Breast Cancer: The National Cancer Institute estimates that women have an average lifetime risk of 13.2% (one in eight) of being diagnosed with breast cancer at some time in their lives. The chance that a woman will never develop breast cancer is 86.8% (seven in eight). Having one first-degree relative with breast cancer approximately doubles a woman’s risk of developing cancer (compared to women having no first-degree relatives with breast cancer). Having two first-degree relatives with breast cancer increases risk fivefold. What is the probability or risk of developing breast cancer in both of the scenarios? What is the relative risk? What is the attributable risk? Discuss the importance (or lack of) of these terms in describing a patient’s risk of breast cancer.