title: The level of ADAM12-S in maternal serum is an early first-trimester marker of fetal trisomy 18.
abstract: BACKGROUND
  ADAM12-S is a pregnancy-associated insulin-like growth factor binding protein-3 (IGFBP-3) and IGFBP-5 protease present in human gestational serum. Recently, maternal serum levels of ADAM12-S were found to be markedly reduced during the first trimester of pregnancies with a Down syndrome (DS) fetus. On the basis of this finding, it was suggested that ADAM12-S might be a useful maternal serum marker of fetal chromosomal disease.
  
  
  OBJECTIVE
  Retrospective examination of the use of ADAM12-S as a marker for fetal trisomy 18.
  
  
  METHODS
  Serum samples were obtained from ten women during the first semester of their pregnancies with fetuses that had trisomy 18. An ELISA was used to determine the levels of ADAM12 in maternal serum. Results were compared to ADAM12-S levels, previously measured in the serum of 170 women carrying normal pregnancies during the first trimester.
  
  
  RESULTS
  In all cases, the ADAM12-S concentration in maternal serum samples was lower in trisomy 18 pregnancies than in normal pregnancies, with a median multiple of the median (MoM) of 0.28 (p < 0.001)
  
  
  CONCLUSIONS
  A reduced concentration of ADAM12-S in maternal serum is a promising marker for foetal trisomy 18, as well as for DS.
authors.affiliation: Department of Clinical Biochemistry, Statens Serum Institut, Copenhagen, Denmark.
authors.forename: Jennie
authors.initials: J
authors.lastname: Laigaard
authors.forename: Michael
authors.initials: M
authors.lastname: Christiansen
authors.forename: Camilla
authors.initials: C
authors.lastname: Fröhlich
authors.forename: Bent Nøorgaard
authors.initials: BN
authors.lastname: Pedersen
authors.forename: Bent
authors.initials: B
authors.lastname: Ottesen
authors.forename: Ulla M
authors.initials: UM
authors.lastname: Wewer
mesh_terms: D051722:ADAM Proteins; D000328:Adult; D015415:Biomarkers / Q000097:blood; D002887:Chromosomes, Human, Pair 18; D042241:Early Diagnosis; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D008565:Membrane Proteins / Q000097:blood*; D008666:Metalloendopeptidases / Q000097:blood*; D011247:Pregnancy / Q000097:blood*; D011261:Pregnancy Trimester, First; D011296:Prenatal Diagnosis / Q000379:methods*; D012189:Retrospective Studies; D014314:Trisomy
chemical_list: D015415:Biomarkers; D008565:Membrane Proteins; D051722:ADAM Proteins; C098660:ADAM15 protein, human; D008666:Metalloendopeptidases