Cancer During our lives, cells in our bodies divide and replace themselves every second. Cancer starts when a cell is somehow changed so that it multiplies out of control. A tumor is a mass, composed of a cluster of such abnormal cells: Most cancers form tumors, but not all tumors are cancerous. Harmless, or noncancerous, tumors such as freckles and moles stop growing and do not spread to other parts of the body, and do …showed first 75 words of 2573 total…

…showed last 75 words of 2573 total…Encyclopedia Stockwell, Serena. "Cancer", Compton’s Interactive encyclopedia. 1972 "Cancer," Bookshelf. 1995 "Cancer," Encarta. 1995 "Cancer," Symptoms Illness & Surgery. 1994 "Cancer ," Home Medical Advisor. 1994 Internet Punn, Steven. "Cancer," Cancer Guide, Feb 25, 1999, www.http://cancerguide.org/ Community Service American Cancer Society, EPA, Ca, Cancer Information Service- 1-800-422-6237 The Health Library Health care Center, Stanford California. Interview Chueng, Byron- Personal Interview. Menlo Park, Ca, February 22nd, 1999 Magazines "Cancer," The Health Library. Pamphlets "Occupational Cancer," The Cancer Foundation of America.