Clinical Trial Phases
Phase II Clinical Trials
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Purpose
The primary purpose of a Phase II trial is to determine the effectiveness of a treatment and to further evaluate its safety.
Number of Participants
The treatment is administered to a larger group, usually 100-300 patients, who are closely monitored for treatment response and side effects.
Duration
Phase II trials may last from several months to 2 years.
Conclusion
If a significant number of patients (usually at least one-fifth) respond favorably to a treatment, it proceeds to Phase III. Approximately 33% of drugs and treatments proceed to the next phase.
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