Coral calcium cures breast cancer. Coral calcium is not an effective treatment for breast cancer. The Federal Trade Commission (FTC) has taken severe legal action against several marketers of coral calcium that claim it helps cure breast cancer. It is believed that some breast cancer patients delayed getting proper medical treatment because they were misled to believe that coral calcium could treat their disease. As a reminder, diet and lifestyle changes should be used in conjunction with drugs, surgery, chemotherapy, radiation therapy, and other treatments with the help of your doctor.