Having breast cancer means that some cells in your breast are growing abnormally. Learning about the different types and stages of breast cancer can help you take an active role in your treatment.
Your entire body is made of living tissue. This tissue is made up of tiny cells. You can't see these cells with the naked eye. Normal cells reproduce (divide) in a controlled way. When you have cancer, some cells become abnormal, changing shape. These cells may divide quickly and spread into other parts of the body.
Normal breast tissue is made of healthy cells. They reproduce new cells that look the same.
Noninvasive breast cancer (carcinoma in situ) occurs when cancer cells are only in the ducts.
Invasive breast cancer occurs when abnormal cells move out of the ducts or lobules into the surrounding breast tissue.
Metastasis occurs when cancer cells move into the lymph nodes or bloodstream and travel to another part of the body.
Date Last Reviewed: 2007-01-15T00:00:00-07:00
Date Last Modified: 2003-06-01T00:00:00-06:00
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