RT Book, Section A1 Chan, June M. A1 Feiger, David A1 Kenfield, Stacey A2 McAninch, Jack W. A2 Lue, Tom F. SR Print(0) ID 1172803379 T1 Introduction to Clinical Research Design T2 Smith & Tanagho's General Urology, 19e YR 2020 FD 2020 PB McGraw Hill PP New York, NY SN 9781259834332 LK accessmedicine.mhmedical.com/content.aspx?aid=1172803379 RD 2024/04/18 AB What is a clinical trial? A clinical trial is a type of research study designed to evaluate the effect of an intervention on a health-related outcome in humans. The intervention can take many forms—medical therapies, behavior changes, or educational materials or websites. The outcome of interest can also be defined in a wide variety of ways—overall survival, disease progression, a body measure (eg, cholesterol level, weight), quality of life or well-being, behavioral change, or other factors. Clinical trials are done to evaluate new approaches to prevention, screening, diagnosis, or treatment.