Cancer is a term for diseases in which abnormal cells divide without control. Cancer can spread through the bloodstream and invade nearby tissues. It can spread into the lymphatic system into other parts of one's body. There are numerous types of cancer. Cancer that begins in the skin or in tissues that line or cover internal organs is carcinoma. Leukemia is a form of cancer that begins in blood forming tissue such as bone marrow and will ............ http://www.capturecancer.com/breast-cancer-symptoms-2.html