According to the American Cancer Society, women in America have a one in eight chance of developing invasive breast cancer, and they estimate that over 1 million people in America have undiagnosed breast cancer.
Invasive breast cancer is a breast cancer that starts in the lobules or duct of the breast (LCIS and DCIS) but then spreads into other tissue within the breast and can spread into the lymph nodes under the arms. If the cancer spreads to the lymph nodes, the cancer cells can be transported via the lymphatic system to other parts of the body, causing metastatic (moving) breast cancer.
Types of Invasive Breast Cancer
There are two types of invasive breast cancer; Invasive Ductal Carcinoma (ICD) and Invasive Lobular Carcinoma (ILD), both of which occur when the cancer that is contained within either the ducts or lobules of the breast spread to surrounding tissue.
Read more about Invasive Ductal Carcinoma and Invasive Lobular Carcinoma.