phase IV trial


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(fayze for tryle)

After a treatment has been approved and is being marketed, it is studied in a phase IV trial to evaluate side effects that were not apparent in the phase III trial. Thousands of people are involved in a phase IV trial.

For more information, see Breastcancer.org's Clinical Trials section or read about studies in Research News.

Weiss_marisa_tcm8-329674

Audio contributed by: Marisa Weiss, M.D.

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