Principal investigator

Principal investigator (PI) refers to the person(s) in charge of a clinical trial or a scientific research grant. The principal investigator prepares and carries out the clinical trial protocol (plan for the study) or research paid for by the grant. The principal investigator also analyzes the data and reports the results of the trial or grant research.

Sourced From
National Cancer Institute (NCI) Dictionary of Cancer Terms
NIH Clinical Research Trials and You:

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