http://youtu.be/SGaQ0WwZ_0I Visit http://www.cancercenter.com/what-is-cancer/ to learn more about this complex disease, how it's treated and how to manage side effects. One in two men and one in three women will be diagnosed with cancer. But what is cancer? Cancer experts at Cancer Treatment Centers of America outline how cancer develops, the most common forms, how it's treated and how to manage treatment side effects. They also discuss what the future holds for cancer treatment. What is cancer? Watch this five-minute video that explains cancer in everyday terms.