Unlike invasive forms of breast cancer, DCIS (ductal carcinoma in situ), is a pre-cancerous condition in which the cancer cells are still contained within the breast ducts, and the surrounding fatty tissue has not been invaded.
By contrast, invasive cancers occur when cancer cells move beyond a contained area, a duct or lobule, into the surrounding fatty tissue. As invasive cancers become more advanced, the cancer cells can spread through the blood or lymphatic system to other organs in the body.
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