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| | A study to compare the results of people taking a new treatment with the results of people taking the standard treatment (for example, which group has better survival rates or fewer side effects). In most cases, studies move into phase III only after a treatment seems to work in phases I and II. Phase III trials may include hundreds of people. |
| Previous Definitions: | phase I trial, phase I/II trial, phase II detoxification, phase II trial, phase II/III trial | | Next Definitions: | phase IV trial, phenethyl isothiocyanate, phenobarbital, phenol, phenothiazine |
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