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Previous studies have not found a consistent association between circulating proprotein convertase subtilisin/kexin type 9 (PCSK9) and the risk of cardiovascular events. The aim of this meta-analysis was to evaluate this association in prospective studies.Methods and Results:A systematic search of prospective studies published through October 2016 was carried out in order to identify studies that met pre-specified inclusion criteria. After independent data extraction, summary relative risks were calculated using random-effects models. On meta-analysis of 6 cohort and 1 nested case-control study, circulating PCSK9 concentration as a continuous variable was not significantly associated with the risk of cardiovascular events (overall RR, 1.12; 95% CI: 0.98-1.29; P=0.09), with significant heterogeneity (I 2 =55.1%, P heterogeneity =0.038). The highest but not middle categories of circulating PCSK9 was significantly associated with the risk of cardiovascular events. On subgroup analysis of study design, mean age at baseline, sample size, follow-up time, and pre-existing disease, there was no significant association between PCSK9 and cardiovascular events. Sensitivity analysis with various exclusion and inclusion criteria did not materially change the results.

circulation journal

Circulating Proprotein Convertase Subtilisin/Kexin Type 9 (PCSK9) Concentration and Risk of Cardiovascular Events ― Systematic Review and Meta-Analysis of Prospective Studies ―