Researchers are investigating genes that may be related to breast cancer and they are examining whether smoking or estrogen levels influence the incidence of the disease. Still no one knows what causes breast cancer. What is known is that early detection and treatment saves lives. There are more than 1.6 million breast cancer survivors in the U.S. today. The five-year survival rate following early diagnosis and treatment is 96 percent.
For women age 40 or older, mammography is an essential part of a three-step program for detecting breast cancer. The other t
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