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BACKGROUND Although lipoprotein-associated phospholipase A2 (Lp-PLA2) levels are associated with cardiovascular events, Lp-PLA2 is physically linked to LDL cholesterol (LDL-C). Whether measures of Lp-PLA2 mass or activity continue to predict risk after LDL-C reduction by statin therapy is uncertain. METHODS Lp-PLA2 mass concentration and activity were evaluated at baseline and after treatment in the Justification for the Use of Statins in Prevention: an Intervention Trial Evaluating Rosuvastatin (JUPITER) trial comparing rosuvastatin 20 mg to placebo among 17 802 men and women without cardiovascular disease or diabetes at study entry. The relationships of Lp-PLA2 mass and activity with risk of future vascular events were evaluated in the placebo and rosuvastatin groups. RESULTS Before randomization, levels of Lp-PLA2 mass and activity correlated moderately with each other and with LDL-C. The magnitude of these correlations increased after statin therapy. Rosuvastatin reduced Lp-PLA2 mass by 33.8%, Lp-PLA2 activity by 33.2%, and LDL-C by 48.7% (all P &amp;lt; 0.0001). Among those study participants allocated to placebo, increasing quartiles of Lp-PLA2 activity (Ptrend = 0.04) but not Lp-PLA2 mass (Ptrend = 0.92) were associated with incident cardiovascular events after adjustment for LDL-C and conventional risk factors. Comparable analyses conducted among those allocated to rosuvastatin revealed no significant relationship between Lp-PLA2 levels and subsequent vascular events. The ability of rosuvastatin to reduce vascular events was not significantly modified by baseline Lp-PLA2 level. CONCLUSIONS Among JUPITER trial participants allocated to placebo, levels of Lp-PLA2 activity, but not mass, were associated with cardiovascular risk. However, Lp-PLA2 no longer predicted risk or modified clinical outcomes when participants were treated with rosuvastatin.

clinical chemistry

Relationship of Lipoprotein-Associated Phospholipase A2 Mass and Activity with Incident Vascular Events among Primary Prevention Patients Allocated to Placebo or to Statin Therapy: An Analysis from the JUPITER Trial