Screening mammography has been shown to reduce deaths from breast cancer among women ages 40 to 74, especially those ages 50 to 69. Cancer screening tests aim to find cancer before it causes symptoms and when it may be easier to treat successfully. An effective screening test is one that. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.