Questions About Cancer? 1-800-4-CANCER

Understanding Cancer Series

  • Posted: 04/07/2006
  • Reviewed: 11/04/2010

Slide 39


Identifying Cancer-Causing Substances

Americans commonly use more than 100,000 chemicals, and this doesn't take into account mixtures or combinations of chemicals. Plus, some chemicals are altered by the atmosphere, water, or incineration.

Scientists have been working for several decades to identify substances that cause cancer. They have three ways to do this: through human studies, animal studies, and laboratory experiments.

Identifying Cancer-Causing Substances