A breast malignancy that has grown and spread beyond the duct or lobule where it originated is called invasive breast cancer. Approximately four out of every five cases of invasive breast cancer originate in the ducts of the breast (invasive ductal carcinoma, or IDC). 

Less common are invasive cancers that begin in the lobules (invasive lobular carcinoma, or ILC).

Your breast cancer treatment will be designed to match your specific diagnosis. 

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