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Statin therapy on glycaemic control in type 2 diabetes: a meta-analysis
Yi Zhou1, Yang Yuan, Rong-Rong Cai
1The Affiliated ZhongDa Hospital of Southeast University, Department of Endocrinology, No. 87 DingJiaQiao Road, Nanjing, 210009, PR China. zhouyi521520@163.com
Objective:
Randomised controlled trials (RCTs) indicate that statin therapy has cardiovascular benefit among patients with type 2 diabetes. Recently, statins were reported to increase risk of diabetes by 9%. The aim was to investigate by a meta-analysis whether statins deteriorate glycaemic control in type 2 diabetes.
Methods:
Medline, EMBASE and Cochrane Central Register of Controlled Trials from 1966 to 2012 were searched for RCTs of statins. Included were only trials with type 2 diabetes.
Main Outcome Measures:
The I(2) statistic was used to measure heterogeneity between trials and calculated mean differences for glycaemic parameters with random-effect meta-analysis.
Results:
26 eligible studies were identified with 3232 participants. Statin therapy had no remarkable influence on HbA1c (WMD 0.04%, 95% CI -0.08 to 0.16, I² = 45.7%, n = 3070), FPG (2.25 mg/dl, 95% CI -3.50 to 7.99, I² = 46%, n = 1176), BMI, fasting insulin or HOMA-IR. However, subgroup analysis showed significant, detrimental effect of atorvastatin on HbA1c, whereas simvastatin presented an ameliorative effect. Meta-regression presented that neither baseline age nor relative reduction in LDL-cholesterol concentrations accounted for residual heterogeneity.
Conclusion:
Statin therapy showed non-significant effect on glycaemic control in type 2 diabetes. Statin therapy need not change among them with moderate or high cardiovascular risk or existing cardiovascular disease.
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