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- cancer comes from cells in a part in the body that begin to grow out of control - normal body cells grow, divide, and die in a set system and pattern - as humans grow older the cell division slow down... cells in adults only divide to replace old or dying cells or to repair injuries - cancer cells continue to grow and divide- instead of dying they outlive the normal cells and form new abnormal cells - the damage in the cancer cells that make them abnormal comes from damage in their DNA - most normal cells with damaged DNA are easily repaired by the body - cancer cells the DNA is not repaired by the body - damage can come from genetics... or exposure to something... in the environment or an action (like smoking) - most cancer forms as a tumor - some cancers don't form tumors and instead involve the blood and blood-forming organs to circulate through tissues where they go - sometimes cancer cells go to other parts of the body where they can grow and replace the normal tissue there (metastasis) - cancer is always named by the place in which the cancer forms (regardless of where they travel to) - though cancer cells may form tumors- not all tumors are cancerous- non-cancerous tumors do not travel or spread to other places in the body - cancer is difficult because different types of cancers act differently... they grow at different rates and respond to different treatments... which is why treatment is so difficult and different cancers require different types of treatment - cancer is the second leading cause of death in the United States - 1/2 of all me and 1/3 of all women in the US will develop cancer during their life - lowering the risk of developing most cancers can be accomplished by making changes in a person lifestyle (quitting smoking... eating better) - the sooner cancer is found and the quicker treatment starts the better chance the patient has for living. http://www.cancer.org/docroot/CRI/content/CRI_2_4_1x_What_Is_Cancer.asp
 * What is cancer?**
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