Cancer is a group of diseases which causes cells in the body to change and grow out of control.
Most cancers are named after the part of the body where they first begin. Breast cancer begins in the breast tissue. The breast is made up of lobules, ducts and fatty, connective and lymphatic tissue. An estimated 192,000 new cases of invasive breast cancer will be diagnosed in women in the year 2001. 46,400 women will die from breast cancer in the year 2001.