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Clinical trials generate data on safety and efficacy. Clinical trials are closely supervised by appropriate regulatory authorities. All studies involving a medical or therapeutic intervention on patients may not be approved by a supervising ethics committee before permission is granted to run the trial.
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A protocol is a document that describes the objective(s), design, methodology, statistical considerations, and organization of a trial. The protocol usually also gives the background and rationale for the trial, but these could be provided in other protocol referenced documents.
Clinical study is any investigation in human subjects intended to discover or verify the clinical, pharmacological and/or other pharmacodynamic effects of an investigational product(s), and/or to identify any adverse reactions to an investigational product(s), and/or to study absorption, distribution, metabolism, and excretion of an investigational product(s) with the object of ascertaining its safety and/or efficacy. The terms clinical trial and clinical study are synonymous.
Research means a systematic investigation, including research development, testing and evaluation, designed to develop or contribute to generalizable knowledge.
For a primary research, data does not exist at the beginning of the study and a researcher has to collect the data using appropriate methods.
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