This information may interest you if you have a higher risk for a certain type of cancer than most people, or you may want to learn about ways to prevent cancer. There are two types of prevention clinical trials that study ways to reduce the risk of getting cancer:

• Action studies (doing something) These focus on finding out whether actions people take, such as getting more exercise or quitting smoking, can prevent cancer.
  
  
• Agent studies (taking something) These studies (also called chemoprevention studies) focus on learning whether taking certain medicines, vitamins, minerals, or food supplements can prevent cancer.

This information focuses on agent studies designed to prevent cancer. When "cancer prevention trials or studies" are mentioned in this resource, they refer only to agent studies. If you want to learn more about other types of clinical trials, including other types of prevention studies, the resources page can help you.

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