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Neopterin, a marker of stimulated cellular immune response, is increased in unstable angina, acute myocardial infarction and possibly stable coronary artery disease. 3-Hydroxy-3-methylglutarylcoenzyme A (HMG-CoA) reductase inhibitors (statins) have antiinflammatory properties, but their effect on neopterin largely unknown. Neopterin was measured in 232 patients undergoing elective coronary angiography and compared to the degree of atherosclerosis, use of concomitant medications and demographics. Neopterin was lower in subjects using statins (n = 66) compared to those not taking statins (median (range): 6.65 (4.1-18.3) vs. 7.70 (3.6-29.1) nmol/l, p &lt; 0.0001). This association was also found in the subgroup of patients with coronary artery disease (1-3-vessel disease, n = 164; 6.60 (4.1-18.3) vs. 7.80 (3.6-29.1) nmol/l, p = 0.0012), whereas only a slight tendency toward lower neopterin levels was found in the group without atherosclerosis (6.90 (5.1-16.0) vs. 7.60 (4.0-18.5) nmol/l, p = 0.17). In patients with coronary atherosclerosis, neopterin concentrations were lower in smokers (n = 105) compared to nonsmokers (7.20 (3.6-29.1) vs. 7.90 (4.4-18.6) nmol/l, p &lt; 0.02), confirming previous observations. However, use of statins was associated with lower neopterin levels in both nonsmokers and smokers (6.70 (4.1-18.3) vs. 7.60 (3.6-29.1) nmol/l, p &lt; 0.05, and 6.20 (5.2-16.0) vs. 7.80 (4.4-18.6) nmol/l, p &lt; 0.05, respectively). Overall, similar serum neopterin concentrations were found in patients with coronary atherosclerosis and those without. In accordance with their antiinflammatory effects, the use of statins is associated with lower neopterin levels in patients undergoing elective coronary angiography. Clin Chem Lab Med 2003; 41(10):13141319

HMG-CoA Reductase Inhibitors Are Associated with Decreased Serum Neopterin Levels in Stable Coronary Artery Disease