title: Prevention and treatment of dementia or Alzheimer's disease by statins: a meta-analysis.
abstract: OBJECTIVE
  3-Hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (statins) are thought to reduce the amount of Abeta peptides by reducing cholesterol from blood and/or cerebrospinal fluid. We performed this meta-analysis to evaluate the preventive and treatment effects of statins on dementia and Alzheimer disease onset.
  
  
  METHODS
  Relevant studies were systematically identified, and data were abstracted according to predefined criteria. We used a fixed-effects model and a random-effects model to compute pooled relative risks and to assess statistical heterogeneity.
  
  
  RESULTS
  The pooled crude odds ratios in statin users as compared with nonusers were 0.67 (95% confidence interval CI 0.54-0.82) in the dementia group and 0.81 (95% CI 0.64-1.02) in the Alzheimer group. The pooled adjusted relative risks calculated by random-effects model were 0.77 (95% CI 0.45-1.30) in the dementia group and 0.81 (95% CI 0.56-1.16) in the Alzheimer group.
  
  
  CONCLUSIONS
  Statin use did not show a beneficial effect on the risk of dementia or Alzheimer's disease. Further study and independent confirmation of the association between statin use and dementia and Alzheimer's disease in larger clinical trials are warranted.
authors.affiliation: Division of Clinical Trial Design and Management, Translational Research Center, Kyoto University Hospital, Kyoto, Japan. zhoubbin@kuhp.kyoto-u.ac.jp
authors.forename: Bin
authors.initials: B
authors.lastname: Zhou
authors.forename: Satoshi
authors.initials: S
authors.lastname: Teramukai
authors.forename: Masanori
authors.initials: M
authors.lastname: Fukushima
mesh_terms: D000544:Alzheimer Disease / Q000517:prevention & control* / Q000628:therapy; D003704:Dementia / Q000517:prevention & control* / Q000628:therapy; D006801:Humans; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000627:therapeutic use*; D015233:Models, Statistical; D016017:Odds Ratio
chemical_list: D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors