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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.
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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.
An observational study involve interventions on the part of the investigator and its data is descriptive.
Case reports and case series studies describe the experience of a single patient or a group of patients with a similar diagnosis.
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