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Pilot/Feasibility Study: Used to check on the time, cost and success rate of a study on a small scale to help researchers decide how or if it should be expanded to a larger group.
Phase 1: Used to find the right dosage of test drug and/or how best to deliver the drug (for example, by mouth or in a vein).
Phase 2: Used to find out if the new treatment works against the cancer and/or whether the new treatment has a good or bad effect on the person.
Phase 3: Compares the new treatment to a current one.
Phase 4: Looks at long-term safety and effectiveness of the new treatment.