When malignant (cancer) cells form in the tissues of the breast
it is called breast cancer. Infiltrating (invasive) ductal carcinoma,
or IDC, starts in a milk passage or duct, breaks through the wall
of the duct, and invades the fatty tissue of the breast and can
spread to other parts of the body. IDC accounts for about 80 percent
of invasive breast cancer. Infiltrating (invasive) lobular carcinoma,
or ILC, starts in the milk glands or lobules and can spread to other
parts of the body. ILC accounts for about 10 percent of of invasive
breast cancers. Ductal carcinoma in situ, or DCIS, is the most common
type of noninvasive breast cancer and is confined to the milk ducts.
Nearly all women with cancer at this stage can be cured.