WEBVTT 00:00:06.667 --> 00:00:13.227 Cancer is a group of over 100 diseases characterized by abnormal, uncontrolled cell growth. 00:00:14.505 --> 00:00:20.587 In a healthy body, cells grow, die, and are replaced in a very controlled way. 00:00:20.587 --> 00:00:26.637 Damage or change in the genetic material of cells by environmental or internal factors 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 00:00:32.651 --> 00:00:40.760 or a tumor develops. Most cancer related deaths are due to metastasis: 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. 00:00:47.210 --> 00:00:52.709 Great advancements have been made, but cancer is still the leading cause of death 00:00:52.709 --> 00:00:59.157 for people under the age of 85. In the United States, one in every four people 00:00:59.157 --> 00:01:01.032 die from cancer.