quality:corruption, structural:summarization
Preventive surgery

Removal of the breasts before breast cancer develops (called preventive mastectomy) reduces the risk of developing breast cancer by more than 95%. In women genetically predisposed to developing breast cancer, preventive mastectomy reduces their risk of dying from breast cancer. For those at normal risk, preventive mastectomy does not reduce their chance of dying, and so is generally not recommended. Removing the second breast in a person who has breast cancer (contralateral risk-reducing mastectomy or CRRM) may reduce the risk of cancer in the second breast, but it is not clear whether removing the second breast improves the chance of survival. An increasing number of women who test positive for faulty BRCA1 or BRCA2 genes choose to have risk-reducing surgery. The average waiting time for undergoing the procedure is two years, which is much longer than recommended.