Early phase 1
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Early phase 1 (formerly listed as Phase 0) refers to a phase of research used to describe exploratory trials conducted before traditional phase 1 trials to investigate how or whether a drug affects the body. They involve very limited human exposure to the drug and have no therapeutic or diagnostic goals.

Sourced From
ClinicalTrials.gov Glossary of Common Site Terms
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NCATS Toolkit for Patient-Focused Therapy Development: Educating Your Disease Community

Phase 0 (formerly)
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