title: The D/I polymorphism in the angiotensin-converting enzyme gene and chronic obstructive pulmonary disease risk: a meta-analysis.
abstract: BACKGROUND
  The deletion/insertion (D/I) polymorphism in the angiotensin-converting enzyme (ACE) gene has been implicated in susceptibility of chronic obstruction pulmonary disease (COPD), but a number of studies have reported inconclusive results. The aim of this study is to investigate the relationship between the D/I polymorphism in the ACE gene and COPD risk by meta-analysis.
  
  
  METHODS
  We searched Pubmed database, Embase database, CNKI database and Wanfang database, covering all studies until October 10, 2011. Statistical analysis was performed by using the software Revman4.2 and STATA 10.0.
  
  
  RESULTS
  A total of 710 COPD cases and 862 controls in 10 case-control studies were included in this study. The results suggested that the DD homozygote carriers did not have an increased or decreased risk of COPD when compared with the heterozygote DI and II homozygote carriers. However, in the subgroup analysis by race, significant increased risks were found in Asian DD homozygote carriers (OR = 2.6 and 95% CI = 1.47-4.57 for DD vs. DI+II) but not in Caucasian DD homozygote carriers (OR = 0.91, 95%CI = 0.69-1.22, P = 0.54 for DD vs. DI+II).
  
  
  CONCLUSIONS
  This meta-analysis suggested that the ACE gene is a COPD susceptible gene in Asian populations. Future studies are needed to validate our conclusions..
authors.affiliation: Department of Respiratory Medicine , The 452 Military Hospital of China, Chengdu, Sichuan 610041, China. lxb166@yeah.net
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Li
authors.forename: Na
authors.initials: N
authors.lastname: Wei
authors.forename: Zhangjun
authors.initials: Z
authors.lastname: Wu
authors.forename: Zhanzhong
authors.initials: Z
authors.lastname: Qi
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.forename: Qiuling
authors.initials: Q
authors.lastname: Chen
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Xia
authors.forename: Shuo
authors.initials: S
authors.lastname: Li
mesh_terms: D000368:Aged; D044466:Asian People / Q000235:genetics; D016022:Case-Control Studies; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D054643:INDEL Mutation; D008297:Male; D008875:Middle Aged; D007703:Peptidyl-Dipeptidase A / Q000235:genetics*; D011110:Polymorphism, Genetic; D029424:Pulmonary Disease, Chronic Obstructive / Q000208:ethnology / Q000235:genetics*; D044465:White People / Q000235:genetics
chemical_list: C488034:ACE protein, human; D007703:Peptidyl-Dipeptidase A