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What are clinical trial phases?

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Clinical trials are conducted in phases, each designed to find out specific information. Each new phase of a clinical trial builds on information from previous stages.

Participants may be eligible for clinical trials in different phases, depending on their overall condition. Most clinical trial participants take part in phases III and IV.

Reviewed by Nayana Ambardekar on October 28, 2017

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What are the phases of a clinical trial?

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