Effect of Torcetrapib on Carotid Atherosclerosis in Familial Hypercholesterolemia
John J.P. Kastelein, M.D., Ph.D., Sander I. van Leuven, M.D., Leslie Burgess, M.D., Greg W. Evans, M.A., Jan A. Kuivenhoven, Ph.D., Philip J. Barter, M.D., Ph.D., James H. Revkin, M.D., Diederick E. Grobbee, M.D., Ph.D., Ward A. Riley, Ph.D., Charles L. Shear, Dr.P.H., William T. Duggan, Ph.D., Michiel L. Bots, M.D., Ph.D., for the RADIANCE 1 Investigators
Background Torcetrapib, an inhibitor of cholesteryl ester transferprotein, may reduce atherosclerotic vascular disease by increasinglevels of high-density lipoprotein (HDL) cholesterol.
Methods A total of 850 patients with heterozygous familial hypercholesterolemiaunderwent B-mode ultrasonography at baseline and at follow-upto measure changes in carotid intimamedia thickness.The patients completed an atorvastatin run-in period and weresubsequently randomly assigned to receive either atorvastatinmonotherapy or atorvastatin combined with 60 mg of torcetrapibfor 2 years.
Results After 24 months, in the atorvastatin-only group, themean (±SD) HDL cholesterol level was 52.4±13.5mg per deciliter and the mean low-density lipoprotein (LDL)cholesterol level was 143.2±42.2 mg per deciliter, ascompared with 81.5±22.6 mg per deciliter and 115.1±48.5mg per deciliter, respectively, in the torcetrapibatorvastatingroup. During the study, average systolic blood pressure increasedby 2.8 mm Hg in the torcetrapibatorvastatin group, ascompared with the atorvastatin-only group. The increase in maximumcarotid intimamedia thickness, the primary measure ofefficacy, was 0.0053±0.0028 mm per year in the atorvastatin-onlygroup and 0.0047±0.0028 mm per year in the torcetrapibatorvastatingroup (P=0.87). The secondary efficacy measure, annualized changein mean carotid intimamedia thickness for the commoncarotid artery, indicated a decrease of 0.0014 mm per year inthe atorvastatin-only group, as compared with an increase of0.0038 mm per year in the torcetrapibatorvastatin group(P=0.005).
Conclusions In patients with familial hypercholesterolemia,the use of torcetrapib with atorvastatin, as compared with atorvastatinalone, did not result in further reduction of progression ofatherosclerosis, as assessed by a combined measure of carotidarterial-wall thickness, and was associated with progressionof disease in the common carotid segment. These effects occurreddespite a large increase in HDL cholesterol levels and a substantialdecrease in levels of LDL cholesterol and triglycerides. (ClinicalTrials.govnumber, NCT00136981
[ClinicalTrials.gov]
.)
Source Information
From the Academic Medical Center, University of Amsterdam, Amsterdam (J.J.P.K., S.I.L., J.A.K.); Tygerberg Hospital and Stellenbosch University, Tygerberg, South Africa (L.B.); Wake Forest University, Winston-Salem, NC (G.W.E., W.A.R.); the Heart Research Institute, Sydney (P.J.B.); Pfizer, New London, CT (J.H.R., C.L.S., W.T.D.); and the Julius Center for Health Sciences and Primary Care, University Medical Center, Utrecht, the Netherlands (D.E.G., M.L.B.). Drs. Kastelein and Bots contributed equally to this article. This article (10.1056/NEJMoa071359) was published at www.nejm.org on March 26, 2007.
Address reprint requests to Dr. Kastelein at the Department of Vascular Medicine, Academic Medical Center, Meibergdreef 9, Room F4-159.2, 1105 AZ, Amsterdam, the Netherlands, or at j.j.kastelein{at}amc.uva.nl.
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