Circulation Journal Official Journal of the Japanese Circulation Society http://www. j-circ.or.jp hronic kidney disease (CKD) and renal replacement treatment are important global public health problems associated with a high risk of cardiovascular disease (CVD) and high health-care costs. 1,2 Dyslipidemia is one of the risk factors (the others are hypertension, diabetes, and smoking) associated with the development and progression of CKD. 3,4 Clinical trials have indicated the powerful effects of 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (statins) on lipid lowering, which is independently associated with the decrease of all cause mortality and cardiovascular mortality. 5,6 Several studies and meta-analyses have shown the renoprotective effects of statins. 7-12 The roles of 2 strong statins (rosuvastatin [RSV] and atorvastatin [ATV]) on renal function, however, still need to be clarified considering the conflicting results.In the PLANET 1 and PLANET 2 trials, diabetic and nondiabetic patients with moderate proteinuria were assigned to RSV or ATV for 1 year. 13,14 It was found that ATV significantly reduced proteinuria without affecting glomerular filtration rate (GFR), whereas RSV was associated with a significant decline in GFR and had no effect on proteinuria. In contrast, Abe et al reported that RSV reduced proteinuria significantly in patients with diabetic nephropathy, 15 and another study by Sawara et al showed that RSV had beneficial roles both on GFR and proteinuria in CKD patients. 16 The previous meta-analysis by Sandhu et al reported significant decrease in the rate of GFR reduction by a mean of 1.22 ml · min -1 · year -1 and meta-regression showed that ATV was associated with a significantly larger beneficial effect on the rate of decline in GFR than other statins. 9 A Cochrane systematic review by Navaneethan et al, however, showed that statins did not improve the decline in renal function as measured by cre- Background: Several clinical trials have reported inconsistent findings for the effects of rosuvastatin (RSV) and atorvastatin (ATV) on renal function. The aim of this meta-analysis was to investigate the effects of these 2 statins on glomerular filtration rate (GFR) and proteinuria respectively, and determine which is better.