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Early detection of breast cancer.

Breast cancer is the most common malignancy in North American women. The incidence rate is increasing by about 2% annually, while the mortality rate has remained stable for 50 years. Screening by physical examination and mammography can decrease the mortality rate in women over 50 by 30%. The screening process is rewarding, but meticulous attention to detail is required in both the physical and mammographic assessment in order to define significant abnormalities.