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Myth: You can't get breast cancer after a mastectomy.

Reality: Some women do get breast cancer after a mastectomy, sometimes at the site of the scar. Or the original cancer may have spread. For women at high risk of breast cancer who have their breasts removed as a prophylactic or preventive measure, there's still a chance, though a small one, that they can get breast cancer. After prophylactic mastectomy a woman's risk for developing breast cancer is reduced by an average of 90%.

Next: Myth: Your father's family history of breast cancer doesn't affect your risk as much as your mother's.