phase 2/phase 3 clinical trial

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.