Journal of Genetic Medicine

Korean Society of Medical Genetics and Genomics (대한의학유전학회)
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First trimester screening for trisomy 18 by a combination of nuchal translucency thickness and epigenetic marker level

  • Lee, Da Eun (Laboratory of Medical Genetics, Medical Research Institute, Cheil General Hospital and Women's Healthcare Center) ;
  • Kim, Shin Young (Laboratory of Medical Genetics, Medical Research Institute, Cheil General Hospital and Women's Healthcare Center) ;
  • Kim, Hyun Jin (Laboratory of Medical Genetics, Medical Research Institute, Cheil General Hospital and Women's Healthcare Center) ;
  • Park, So Yeon (Laboratory of Medical Genetics, Medical Research Institute, Cheil General Hospital and Women's Healthcare Center) ;
  • Kim, Min Hyoung (Department of Obstetrics and Gynecology, Cheil General Hospital and Women's Healthcare Center, Dankook University College of Medicine) ;
  • Han, You Jung (Department of Obstetrics and Gynecology, Cheil General Hospital and Women's Healthcare Center, Dankook University College of Medicine) ;
  • Ryu, Hyun Mee (Laboratory of Medical Genetics, Medical Research Institute, Cheil General Hospital and Women's Healthcare Center)
  • Received : 2017.05.08
  • Accepted : 2017.06.14
  • Published : 2017.06.30
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Abstract

Purpose: The aim of this study was to assess the diagnostic efficacy of noninvasive prenatal screening for trisomy 18 by assessing the levels of unmethylated-maspin (U-maspin) and fetal nuchal translucency (NT) thickness during the first trimester of pregnancy. Materials and Methods: A nested case-control study was conducted using maternal plasma samples collected from 65 pregnant women carrying 11 fetuses with trisomy 18 and 54 normal fetuses. We compared the U-maspin levels, NT thicknesses, or a combination of both in the first trimester between the case and control groups. Results: U-maspin levels and NT thickness were significantly elevated in the first trimester in pregnant women carrying fetuses with trisomy 18 when compared to those carrying normal fetuses (27.2 vs. 6.6 copies/mL, P<0.001 for U-maspin; 5.9 vs. 2.0 mm, P<0.001 for NT). The sensitivities of the U-maspin levels and NT thickness in prenatal screening for fetal trisomy 18 were 90.9% and 90.9%, respectively, with a specificity of 98.1%. The combined U-maspin levels and NT thickness had a sensitivity of 100% in prenatal screening for fetal trisomy 18, with a specificity of 98.1%. Conclusion: A combination of U-maspin levels and NT thickness is highly efficacious for noninvasive prenatal screening of fetal trisomy 18 in the first trimester of pregnancy.

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References

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