Objectives: To present a snapshot of experimental cardiovascular research with a focus on geographical and temporal patterns of early termination due to poor accrual.
Setting: The Aggregate Analysis of ClinicalTrials.gov (AACT) database, reflecting ClinicalTrials.gov as of 27 March 2016.
Design: The AACT database was searched for all cardiovascular clinical trials that started from January 2006 up to December 2015.
Results: Thirteen thousand and seven hundred twenty-nine cardiovascular trials were identified. Of these, 8900 (65%) were classified as closed studies. Globally, 11% of closed trials were terminated. This proportion varied from 9.6% to 14% for trials recruiting from Europe and Americas, respectively, with a slightly decreasing trend (p=0.02) over the study period. The most common reason for trials failing to complete was poor accrual (41%). Intercontinental trials exhibited lower figures of poor accrual as the reason for their early stopping, as compared with trials recruiting in a single continent (28% vs 44%, p=0.002).
Conclusions: Poor accrual significantly challenges the successful completion of cardiovascular clinical trials. Findings are suggestive of a positive effect of globalisation of cardiovascular clinical research on the achievement of enrolment goals within a reasonable time frame.
Keywords: Clinical trials; EPIDEMIOLOGY; STATISTICS & RESEARCH METHODS.
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