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phase 2/phase 3 clinical trial

(fayz …/fayz ... KLIH-nih-kul TRY-ul)
A study that tests how well a new treatment works for a certain type of cancer or other disease and compares the new treatment with a standard treatment. Phase 2/phase 3 clinical trials may also provide more information about the safety and side effects of the new treatment. Combining phases 2 and 3 may allow research questions to be answered more quickly or with fewer patients. Also called phase II/III clinical trial.
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