clearwater (asker) Nov 6, 2007:

全文如下：
Prophylactic Surgery
The most severe option in cancer prevention is prophylactic surgery to remove tissue that could eventually become cancerous. Frequently considered in cases where women have a high environmental or genetic risk for breast, ovary or uterine cancer, prophylactic surgery is a drastic procedure that can significantly impact the chances of developing cancer. Patients who chose this option have often undergone months or years of close monitoring and testing. According to the National Cancer Institute, a preventive mastectomy may reduce the chance of breast cancer by about 90%.