Classification
trial phase
tri·al phase
Definitions related to trial phase:
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(phase) A step in the clinical research and development of a therapy from initial clinical trials to post-approval studies. NOTE: Clinical trials are generally categorized into four (sometimes five) phases. A therapeutic intervention may be evaluated in two or more phases simultaneously in different trials, and some trials may overlap two different phases.CDISC TerminologyClinical Data Interchange Standards Consortium (CDISC), 2021
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Any defined stage in the lifecycle of a clinical trial.CDISC TerminologyClinical Data Interchange Standards Consortium (CDISC), 2021
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Clinical trials are broken into three or four phases: Phase I tests a new drug or treatment for safety in a small group; Phase II expands the study to a larger group of people; Phase III expands the study to an even larger group of people to measure whether the treatment actually benefits patients, and whether its benefits exceed its risks; and Phase IV takes place after the drug or treatment has been licensed and marketed.NCI ThesaurusU.S. National Cancer Institute, 2021
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