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Home >Information for Patients > Dictionary Index
Dictionary of Cancer Terms
View in Spanish: Ensayo de fase IV
Phase IV trial
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.
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.
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