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Clinical trials will generally have three or four phases. Phase 1 is a safety trial where a small number of healthy volunteers are given the treatment to see whether there are any serious side effects. If this is successful, then researchers will proceed to phase 2, testing a larger sample of people in order to discover how effective the treatment is and the best way to administer it. Phase 3 will often involve many thousands of patients, some receiving the new treatment while others have the current standard treatment, so that it can be established whether the new one is really better. A phase 4 trial may follow after a drug has been licensed.

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