primary endpoint

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The main result measured at the end of a study to see if a given treatment has worked. For example, researchers might look at survival or risk of recurrence as primary endpoints. The study then compares these factors in the treatment group and the control group. The primary endpoints need to be determined before the study begins.

For more information, visit Breastcancer.org's Clinical Trials pages.

Audio contributed by: Marisa Weiss, M.D.