Breast cancer occurs when abnormal cells grow out of control in one or both breasts. They can invade nearby tissues and form a mass, called a malignant tumor. The cancer cells can spread (metastasize) to the lymph nodes and other parts of the body.
The exact cause of breast cancer is not known. Female hormones and increasing age play a part. The chances that you will develop breast cancer increase as you age. Family history also plays a role in the development of breast cancer. You are more likely to have breast cancer if your mother, father, or sister has breast cancer. If you have a strong family history of breast or ovarian cancer, you may want to be tested for these genes.
Breast cancer is many women's worst fear. But experts have made great progress in treating cancer. If it is found early, breast cancer can often be cured, and it is not always necessary to remove the breast.
October 2009
Sources: Healthwise
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