Update on the clinical trial landscape: analysis of ClinicalTrials.gov registration data, 2000-2020.

Trials · 2022 · PMC9540299 · PMID 36203212

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a notable trendno p-value reported

A notable trend observed in this analysis was the decline in phase 1–4 trials and the increase in trials without FDA-defined phases, indicated as “Phase N/A” in ClinicalTrials.gov.

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