Treatment trials test new treatments (like a new cancer drug, new approaches to surgery or radiation therapy, new combinations of treatments, or new methods such as gene therapy). See Taking Part in Cancer Treatment Research Studies.
Prevention trials test new approaches, such as medicines, vitamins, minerals or other supplements that doctors believe may lower the risk of a certain type of cancer. These trials look for the best way to prevent cancer in people who have never had cancer or to prevent cancer from coming back or a new cancer from occurring in people who have already had cancer. See If You Want To Find Ways To Prevent Cancer...Learn About Prevention Clinical Trials for more information.
Screening trials test the best way to find cancer, especially in its early stages. See Understanding Screening Trials for additional information.
Quality of Life trials (also called Supportive Care trials) explore ways to improve comfort and quality of life for cancer patients. See Understanding Supportive Care Trials for additional information.