Voyage deep inside your body to see, on a cellular level, why 1 in 2 men and 1 in 3 women will be diagnosed with cancer during their lifetime. Watch a cell reproducing normally and a breast cancer cell dividing out of control. Dr. Jeremy Geffen, oncologist, and Dr. Kevin Gardner of the National Cancer Institute explain that damaged DNA causes cancer—and every cell in your body undergoes 10,000 DNA damage events each day. Dr. Candace Pert, neuroscientist, and Dr. Mark Liponis of Canyon Ranch talk about why cancer represents an immune system failure. Most of your risk for cancer is due to lifestyle factors. Watch as fat cells balloon in size and learn how they secrete cancer-inducing chemicals. View breast and colon cancer inside the body. Find out how you can dramatically decrease your risk of cancer.