A lot of us have heard a lot about breast cancer, but what exactly is it? Breast cancer is a lump of cells that rapidly grow and divide in various parts of the breast and breast tissue. 80% of breast cancer is formed in the hollow areas of the mammary ducts, the other 20% occurs in the lobules. Cancerous tumors usually grow very slowly and can actually be present for 10 years before being detectable by a self examination. However, a lump does not necessarily mean you have evasive cancer. It is very important to understand the difference between carcinoma in situ and invasive breast cancer.

