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(Circulation. 2001;103:1191.)
© 2001 American Heart Association, Inc.
Brief Rapid Communications |
From the Center for Cardiovascular Disease Prevention (P.M.R., N.R.), Brigham and Womens Hospital, Boston, Mass; the Department of Clinical Pathology, Childrens Hospital Medical Center (N.R.), Boston, Mass; and Bayer Pharmaceuticals, Westhaven, Conn (S.P.L.).
Correspondence to Dr Paul Ridker, Brigham and Womens Hospital, 900 Commonwealth Avenue East, Boston, MA 02115. E-mail pridker{at}partners.org
| Abstract |
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Methods and ResultsWe measured CRP, LDL cholesterol (LDL-C), and HDL cholesterol (HDL-C) levels among 785 patients with primary hypercholesterolemia at baseline and after 8 weeks of therapy with either 0.4 or 0.8 mg of cerivastatin. Overall, cerivastatin resulted in a 13.3% reduction in median CRP levels (P<0.001) and a 24.5% reduction in mean CRP levels (P<0.001). Although LDL-C promptly decreased in a dose-dependent manner (mean LDL-C reduction, 37.3% for 0.4 mg and 42.2% for 0.8 mg of cerivastatin), no clear dose-response effect of cerivastatin on CRP was observed, nor was there any substantive correlation between the magnitude of change in CRP and the magnitude of change in LDL-C (r=-0.08) or the magnitude of change in HDL-C (r=-0.04). Thus, <2% of the variance in the percent change in CRP over 8 weeks could be attributed to the percent change in either of these lipid parameters. Further, there was no evidence of correlation between baseline CRP levels and baseline lipid levels or between end-of-study CRP levels and end-of-study lipid levels.
ConclusionsAmong 785 patients with primary hypercholesterolemia, CRP levels were significantly reduced within 8 weeks of initiating cerivastatin therapy in a lipid-independent manner.
Key Words: statins inflammation C-reactive protein cholesterol
| Introduction |
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Despite these observations, whether the effect of pravastatin on CRP is generalizable to other statin agents is uncertain,10 the time course of the CRP effect attributable to statins is largely unknown, and no dose-response data are available. We evaluated these issues in an 8-week randomized trial of cerivastatin given at either 0.4 or 0.8 mg daily in a cohort of 785 patients with primary hypercholesterolemia.
| Methods |
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Because the distribution of CRP is skewed rightward, median concentrations were computed at baseline and at study completion, and the significance of any difference in distributions was assessed by the Wilcoxon rank-sum test. We also computed the absolute and percent change in CRP observed over time for each study subject, a process that resulted in a normal distribution of values. Thus, paired t tests were used to evaluate the significance of any difference in mean CRP changes over time, both overall and within each dose stratum. Correlation coefficients were computed to assess any evidence of association between the change in CRP observed over time and the change observed for LDL-C or HDL-C. Log-normalized values were used to assess any correlation between baseline CRP levels and baseline levels of either LDL-C or HDL-C. All analyses were repeated according to randomized dose assignment, and all probability values are 2-tailed.
| Results |
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Table 1
displays baseline and 8-week plasma levels of LDL-C
and HDL-C for all 785 subjects evaluated. As expected, LDL-C levels
significantly decreased from a mean of 192.7 mg/dL at baseline to 112.8
mg/dL after 8 weeks (41.0% reduction,
P<0.001). Similarly, HDL-C
levels increased from a mean of 49.0 mg/dL at baseline to 52.7 mg/dL at
8 weeks (7.8% increase,
P<0.001).
|
As also shown, median CRP levels decreased from 0.15 mg/dL at baseline to 0.13 mg/dL at 8 weeks; this 13.3% reduction in median levels was attributable to cerivastatin (P<0.001). Accordingly, mean levels of CRP decreased from 0.33 mg/dL to 0.25 mg/dL, an average reduction of 24.5% (P<0.001). Although 61% of participants had a net reduction in CRP, 39% had no change or an increase in CRP, and 18 participants (2%) had a net increase in excess of 1 mg/dL, suggesting possible intercurrent infection.
The effects of both low-dose (0.4 mg) and high-dose (0.8 mg)
cerivastatin on LDL-C, HDL-C, and CRP are displayed in
Table 2
and in the
Figure
.
Both doses of cerivastatin led to significant reductions in LDL-C and
elevations of HDL-C and, as expected, a dose-response effect was
observed for LDL-C (mean LDL reduction, 37.3% for 0.4 mg of
cerivastatin and 42.2% for 0.8 mg of cerivastatin;
P<0.001). In contrast, there
was no clear dose-response effect of cerivastatin on CRP levels (median
CRP reduction, 11.1% for 0.4 mg of cerivastatin and 13.3% for 0.8 mg
of cerivastatin;
P=NS).
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We performed several additional analyses designed to address whether the change in CRP observed over time might be related to changes in lipid levels associated with cerivastatin use. In the total cohort, no substantive correlation was observed between the magnitude of change in CRP and the magnitude of change in LDL-C (r=-0.08), or between the magnitude of change in CRP and the magnitude of change in HDL-C (r=-0.04). Indeed, <2% of the variance in the percent change in CRP over time could be attributed to the percent change in either lipid parameter. This lack of correlation was observed both at low and high doses of cerivastatin. Similarly, we observed minimal evidence of correlation between baseline CRP levels and baseline lipid levels and between end-of-study CRP levels and end-of-study lipid levels (all r values <0.1).
| Discussion |
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We think these data have clinical relevance and importantly extend prior observations. First, the magnitude of reduction in median CRP levels observed in this study of cerivastatin (13.3%) is very similar to the magnitude of reduction in median CRP levels previously observed in the CARE trial of pravastatin (17.4%)9 and in data from our group in the Air Force/Texas Coronary Atherosclerosis Prevention Study (AFCAPS/TexCAPS) of lovastatin (median reduction, 14.8%). Thus, on the basis of the consistency of these 3 studies, which together include serial CRP evaluation in >7000 patients, it seems that the effects of statins on CRP may represent a class effect.
Second, as also observed in the CARE trial of pravastatin and in the AFCAPS/TexCAPS trial of lovastatin, the change in CRP observed in the current study of cerivastatin was not related to the change in LDL-C achieved by this agent. Thus, <2% of the variance in the percent change in CRP could be accounted for by the percent change in LDL-C. This latter observation is important because it supports the hypothesis that mechanisms in addition to LDL reduction may be important for statin therapy. Because primary prevention studies have consistently found that individuals with low LDL-C but high CRP levels are at high vascular risk, these data also support the hypothesis that statin therapy might be effective even in the absence of overt hyperlipidemia, an issue in need of direct testing in future clinical trials.
Finally, the current data demonstrate that the effect of statins on CRP is present after as early as 8 weeks; these data expand on prior work that showed effects either at 1 year or at 5 years.9 In addition to the mechanistic implications of these data, the fact that CRP levels decline as early as 8 weeks also has implications for the timing of the initiation of statin therapy in several clinical settings, and again supports the hypothesis that plaque stabilization may be a critical mechanism of effect for these agents.
To date, the specific pathways by which statins reduce CRP and exert anti-inflammatory effects remain uncertain. However, intensive research efforts have demonstrated that statins impact several different components of the inflammatory cascade.13 With specific regard to cerivastatin, reduced macrophage content within atherosclerotic plaque has been demonstrated with this agent,14 as has direct suppression of the growth of macrophages and their subsequent expression of matrix metalloproteinases and tissue factor.15 Other studies suggest that statins may have important anti-inflammatory effects at the level of the vessel wall, data which are particularly intriguing given the recent demonstration that CRP can directly induce the expression of several cellular adhesion molecules critical to early atherogenesis.7
| Acknowledgments |
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Received November 21, 2000; revision received December 31, 2000; accepted January 18, 2001.
| References |
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