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Compound Evidence InstituteEvidence synthesis · established 2023Graded assessments of compounds, trials, methods and supply
Document set current to 30 July 2026
Defined term · Trial design and conduct

Phase 2

Exploratory clinical development establishing dose and preliminary efficacy. Phase 2 estimates in selected populations are systematically larger than the confirmatory estimates that follow them.

Document identifier
CEI-GT-061
Series
Defined term
Version
1.0
Published
30 Jul 2026
Last reviewed
30 Jul 2026
Certainty
Not rated

§1Phase 2

§1.2Category

Trial design and conduct — Terms describing how a clinical study is constructed and run.

§1.3Related terms

  • Phase 3 — Confirmatory clinical development, adequately powered for a pre-specified primary endpoint in the population for which authorisation is sought.
  • Dose-finding — A study comparing several doses to characterise the dose–response relationship, usually conducted in phase 2 and usually not powered for a definitive efficacy conclusion…
Compound Evidence Institute · CEI-GT-061 · https://compoundevidence.com/glossary/phase-2/ · retrieved 30 July 2026
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