Clinical trials are critical for helping researchers and doctors find new and better ways to detect, diagnose, control, and treat diseases, including cancer. The results from clinical trials can lead to the approval of new, safe treatments that are more effective at fighting cancer than are currently available treatments. They can also discover new ways of using existing treatments. Participants who volunteer for clinical trials play a vital role in advancing knowledge about cancer, developing new tools and treatments in cancer medicine, and ultimately helping current and future cancer patients.