Invasive breast cancer (also called infiltrating breast cancer) has spread to the normal tissues within or surrounding the breast, or to other parts of the body through the blood and lymph systems.
There are two main types of invasive breast cancer:
Sometimes, breast cancer can be both invasive and noninvasive: some of the cancer cells have grown into normal tissue and some has remained in the ducts or lobules. This type of cancer is treated as an invasive cancer. In some invasive breast cancers, malignant cells may be present in both the ducts and lobues. This type of “mixed tumor” breast cancer is usually treated as ductal carcinoma.
Invasive breast cancer is the most common type of breast cancer among American women. According to the American Cancer Society, 207,090 new cases of invasive breast cancer were diagnosed in women in 2010.
There are also several subtypes of invasive breast cancer, including:
Treatment for invasive breast cancer usually involves some combination of breast-conserving surgery or mastectomy, radiation therapy, chemotherapy, hormone therapy and/or targeted therapy. The specific treatments involved and the order of the therapies largely depends on the stage and characteristics of the tumor.