All glossary terms

Trial phase

Meaning

Trial phases describe stages of clinical development. Phase 2 commonly explores activity and further evaluates safety; Phase 3 commonly evaluates benefit and risk in larger populations.

In TrialRedline

Initial coverage focuses on company-sponsored Phase 2/3 drug trials linked to US-listed companies. We keep the phase labels from ClinicalTrials.gov.

Read the original definitions

NIH: Glossary of clinical research terms