IE 398 Recitation-8 - 30.04.2010 IE 398 Systems Thinking...

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30.04.2010 IE 398 Systems Thinking Spring 2010 Recitation 8 Breast cancer is currently the biggest single cause of mortality for women in developed countries. Breast cancer incidence and aggressiveness vary with the age of the patient. The disease usually starts with a small growth or lump in the breast tissue. In its early stages such a growth is usually benign. If left untreated, it will enlarge and often become malignant, invading adjacent tissue and ultimately spreading to other parts of the body –so- called metastasis. The rate of progression varies from person to person and with age. The age specific incidence of breast cancer rises steadily from the mid twenties through the reproductive years. At menopause there is a temporary drop, after which the rate climbs again. About 95% of all potentially cancerous growths discovered at a preinvasive stage can be cured. It is thus crucial that it can be detected as early as possible. In the 1970s screening trials were made in Sweden, England, and the USA in an effort to reduce breast cancer mortality. It is now
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IE 398 Recitation-8 - 30.04.2010 IE 398 Systems Thinking...

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