oronary heart disease (CHD) is the leading cause of death in developed countries, and hypercholesterolemia is an independent risk factor for the progression of atheromatous plaque. Elevated serum cholesterol is causally associated with increased risk of CHD, and a series of randomized trials [1][2][3][4][5][6] have confirmed the benefits of HMG-CoA reductase inhibitors (statins) for hypercholesterolemia in the primary and secondary prevention of CHD. A recent meta-analysis showed that statin therapy reduced the risk of major coronary events by 31% and all-cause mortality by 21%. 7 Guidelines from medical organizations, such as the National Cholesterol Education Program Adult Treatment Panel and the Japan Atherosclerosis Society, suggest that serum low-density lipoproteincholesterol (LDL-C) should be maintained below 100 mg/dl in patients with CHD; 8,9 however, a recent survey, the Lipid Treatment Assessment Project, showed that only approximately 20% of high-risk patients currently achieve Circulation Journal Vol.71, December 2007 these goals. 10 Similar data illustrating the low proportion of patients who meet cholesterol goals have been reported in Europe 11 and Japan. 12 The incidence of CHD in the Japanese population is relatively lower than that reported in Western countries, and Japanese patients with CHD do not often have accompanying moderate or marked hypercholesterolemia. [13][14][15] Despite the rapid growth in knowledge of the clinical use of statins obtained from clinical trials, it is still unclear whether a marked reduction of LDL-C in patients with CHD and mild hypercholesterolemia would further reduce the clinical events. Subgroup analysis from the Cholesterol And Recurrent Event (CARE) trials 16 indicated no additional clinical benefit of treating LDL-C below 125 mg/dl, and the Pravastatin Pooling Project 17 results support this observation. Subgroup analysis from the Pravastatin or Atorvastatin Evaluation and Infection Therapy (PROVE IT) study 18 showed no additional clinical benefit of intensive lipid-lowering therapy in patients with LDL-C levels below 125 mg/dl. By contrast, the Heart Prevention Study (HPS) indicated a clinical benefit of treating LDL-C from below 116 to below 77 mg/dl. 5 In parallel with clinical outcome trials, some trials using intravascular ultrasound (IVUS) have investigated the effects of statins on the progression of atherosclerosis. [19][20][21] The Reversal study showed a slowing of the progression of atherosclerosis during statin treatment, 20 and the ASTER-OID trial showed regression of coronary atherosclerosis if very low LDL-C levels were achieved. 21 In Japan, however, there have been few studies that show the effects of statin treatment on coronary atherosclerotic lesions. 22 Circ J 2007; 71: 1845 -1850 Background It is unclear whether a marked reduction of low-density lipoprotein-cholesterol (LDL-C) in patients with coronary heart disease (CHD) and mild hypercholesterolemia leads to less progression of atherosclerosis.
Methods and ResultsPatients with...