Mammography to screen asymptomatic women for breast cancer.

Despite the lack of absolute confirmation from a properly controlled clinical trial, there is now sufficient evidence to permit the working assumption that screening mammography beginning at age 40 will play a substantial role in controlling breast cancer. An analysis of available data indicates that the benefits of mammographic screening far exceed potential risk, and that earlier detection of cancer will actually add years to life rather than simply permit an earlier diagnosis. American radiologists are now challenged to provide screening mammography in an easily accessible and inexpensive form, so that it is effectively available to all women over age 40.