Acute kidney injury (AKI) develops up to approximately 30% of patients who undergo cardiac surgery (1), and independently associating with increased risk of morbidity and mortality (1,2). The prevention of AKI following cardiac surgery is predominantly important. Statin have been expected to reduce the development of AKI following cardiac surgery based on its anti-inflammatory effects. However, several observational cohort studies focusing on statin treatment as a preventive effect of AKI have been reported with conflicting results (3,4). Retrospective studies might have limitations of inevitable selection bias, and leading into the possibility of misleading and inconclusive results. To date, there is little evidence from randomized trials in populations receiving cardiac surgery to support the role of perioperative statin treatment to prevent AKI.Recently, Billings and colleagues conducted the prospective double-blinded randomized controlled trial of a perioperative statin for prevention of AKI following cardiac surgery (5). Their hypothesis was that perioperative statin would reduce AKI following cardiac surgery by 30% as compared to placebo with an assumed AKI incidence of 27.6% in the placebo group, a type I error probability of 0.05, and 80% power. They enrolled a total of 615 patients (199 naïve to statin treatment and 416 already taking a statin). Enrolled patients were randomized to perioperative statin treatment (80 mg of atorvastatin the day prior surgery, 40 mg of atorvastatin the morning of surgery, and 40 mg of atorvastatin daily following surgery for the duration of hospitalization) or placebo. If patients already taking statin, their pre-enrollment statin was continued until the day of surgery and resumed taking their previously prescribed statin on postoperative day 2 because of ethical issue. The primary endpoint was the incidence of AKI, which was defined as an increase of 0.3 mg/dL in serum creatinine concentration or the initiation of renal replacement therapy within 48 hours of surgery.The data and safety monitoring board recommended stopping the group naïve to statin treatment due to increased AKI among these participants with chronic kidney disease (CKD), defined as an estimated glomerular filtration rate <60 mL/min/1.73 m 2 , receiving atorvastatin. Summary of study results are shown in