title: Risk of chromosomal abnormalities in early spontaneous abortion after assisted reproductive technology: a meta-analysis.
abstract: BACKGROUND
  Studies on the risk of chromosomal abnormalities in early spontaneous abortion after assisted reproductive technology (ART) are relatively controversial and insufficient. Thus, to obtain a more precise evaluation of the risk of embryonic chromosomal abnormalities in first-trimester miscarriage after ART, we performed a meta-analysis of all available case-control studies relating to the cytogenetic analysis of chromosomal abnormalities in first-trimester miscarriage after ART.
  
  
  METHODS
  Literature search in the electronic databases MEDLINE, EMBASE, and Cochrane Central Register of Controlled Trials (CENTRAL) based on the established strategy. Meta-regression, subgroup analysis, and Galbraith plots were conducted to explore the sources of heterogeneity.
  
  
  RESULTS
  A total of 15 studies with 1,896 cases and 1,186 controls relevant to the risk of chromosomal abnormalities in first- trimester miscarriage after ART, and 8 studies with 601 cases and 602 controls evaluating frequency of chromosome anomaly for maternal age≥35 versus <35 were eligible for the meta-analysis. No statistical difference was found in risk of chromosomally abnormal miscarriage compared to natural conception and the different types of ART utilized, whereas the risk of fetal aneuploidy significantly increased with maternal age≥35 (OR 2.88, 95% CI: 1.74-4.77).
  
  
  CONCLUSIONS
  ART treatment does not present an increased risk for chromosomal abnormalities occurring in a first trimester miscarriage, but incidence of fetal aneuploidy could increase significantly with advancing maternal age.
authors.affiliation: Department of Obstetrics and Gynecology, First Affiliated Hospital of Guangxi Medical University, Nanning, China.
authors.forename: Jun-Zhen
authors.initials: JZ
authors.lastname: Qin
authors.forename: Li-Hong
authors.initials: LH
authors.lastname: Pang
authors.forename: Min-Qing
authors.initials: MQ
authors.lastname: Li
authors.forename: Jing
authors.initials: J
authors.lastname: Xu
authors.forename: Xing
authors.initials: X
authors.lastname: Zhou
mesh_terms: D000022:Abortion, Spontaneous / Q000235:genetics*; D000328:Adult; D002869:Chromosome Aberrations; D005260:Female; D006801:Humans; D027724:Reproductive Techniques, Assisted; D012307:Risk Factors