Millions of U.S. workers are exposed to substances that have tested as carcinogens in animal studies. Cancer is a group of different diseases that have the same feature, the uncontrolled growth and spread of abnormal cells. Each different type of cancer may have its own set of causes.
Many factors play a role in the development of cancer.
The importance of these factors is different for different types of cancer. A person's risk of developing a particular cancer is influenced by a combination of factors that interact in ways that are not fully understood. In many cases, these factors may act together or in sequence to cause cancer. Policy Some links on this page are to files and are identified. Adobe Acrobat Reader is needed to view these files.