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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.