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No best answer has yet been selected by qaz13. Once a best answer has been selected, it will be shown here.
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.