1 00:00:06,667 --> 00:00:13,227 Cancer is a group of over 100 diseases characterized by abnormal, uncontrolled cell growth. 2 00:00:14,505 --> 00:00:20,587 In a healthy body, cells grow, die, and are replaced in a very controlled way. 3 00:00:20,587 --> 00:00:26,637 Damage or change in the genetic material of cells by environmental or internal factors 4 00:00:26,637 --> 00:00:32,651 sometimes results in cells that do not die and continue to multiply until a mass of cancer cells 5 00:00:32,651 --> 00:00:40,760 or a tumor develops. Most cancer related deaths are due to metastasis: 6 00:00:40,760 --> 00:00:47,210 malignant cells that penetrate into the circulatory system and establish colonies in other parts of the body. 7 00:00:47,210 --> 00:00:52,709 Great advancements have been made, but cancer is still the leading cause of death 8 00:00:52,709 --> 00:00:59,157 for people under the age of 85. In the United States, one in every four people 9 00:00:59,157 --> 00:01:01,032 die from cancer.