Reform Gaining Huge Numbers Of Votes...
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For more on marking an answer as the "Best Answer", please visit our FAQ.I would say the difference is, for eg.. If you had a known condition ie. Breast cancer and was given a drug eg.Herceptin that would be a clinical trial as in the patient has a condition and you are testing the response to a new drug. If someone just tests a drug they have no physical symptoms/condition which the drug is been tested for. Healthy volunteers against patients with established disease.