Knowing you have the BRCA1 gene means you can prevent breast cancer. About five percent of women in the United states who have breast cancer are thought to carry the mutant BRCA1 gene. Women who carry this gene have an 85 percent lifetime risk of developing breast cancer. Researchers are now developing a screening test to allow these women to be identified. Once they are identified, they will need to be closely monitored by their doctors.
Prophylactic mastectomies protect against breast cancer in high risk women.
Breast tissue extends up towards the neck, the armpits, and the chest wall. Risk of developing breast cancer remains as long as there is breast tissue in the body. A diagnosis of LCIS means you will definitely develop breast cancer. Prophylactic mastectomy does not prevent the development of breast cancer. Women with LCIS should be monitored with frequent breast exams by their doctor and have yearly mammograms.