Statins and risk of incident diabetes: a collaborative meta-analysis of randomised statin trials. That's the name of a recent study.
From the study:
INTERPRETATION: Statin therapy is associated with a slightly increased risk of development of diabetes, but the risk is low both in absolute terms and when compared with the reduction in coronary events. Clinical practice in patients with moderate or high cardiovascular risk or existing cardiovascular disease should not change.
Link: http://www.ncbi.nlm.nih.gov/pubmed/20167359