Performance of prenatal cfDNA screening for sex chromosomes

K. Martin, P. Dar, C. MacPherson, M. Egbert, Z. Demko, S. Parmar, K. Hashimoto, S. Haeri, F. Malone, R. J. Wapner, A. S. Roman, A. Khalil, R. Faro, R. Madankumar, N. Strong, R. M. Silver, N. Vohra, Jon Hyett, M. Rabinowitz, C. KaoH. Hakonarson, B. Jacobsson, M. E. Norton

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: The aim of this study was to assess the performance of cell-free DNA (cfDNA) screening to detect sex chromosome aneuploidies (SCAs) in an unselected obstetrical population with genetic confirmation. Methods: This was a planned secondary analysis of the multicenter, prospective SNP-based Microdeletion and Aneuploidy RegisTry (SMART) study. Patients receiving cfDNA results for autosomal aneuploidies and who had confirmatory genetic results for the relevant sex chromosomal aneuploidies were included. Screening performance for SCAs, including monosomy X (MX) and the sex chromosome trisomies (SCT: 47,XXX; 47,XXY; 47,XYY) was determined. Fetal sex concordance between cfDNA and genetic screening was also evaluated in euploid pregnancies. Results: A total of 17,538 cases met inclusion criteria. Performance of cfDNA for MX, SCTs, and fetal sex was determined in 17,297, 10,333, and 14,486 pregnancies, respectively. Sensitivity, specificity, and positive predictive value (PPV) of cfDNA were 83.3%, 99.9%, and 22.7% for MX and 70.4%, 99.9%, and 82.6%, respectively, for the combined SCTs. The accuracy of fetal sex prediction by cfDNA was 100%. Conclusion: Screening performance of cfDNA for SCAs is comparable to that reported in other studies. The PPV for the SCTs was similar to the autosomal trisomies, whereas the PPV for MX was substantially lower. No discordance in fetal sex was observed between cfDNA and postnatal genetic screening in euploid pregnancies. These data will assist interpretation and counseling for cfDNA results for sex chromosomes.
Original languageEnglish
Article number100879
Number of pages9
JournalGenetics in Medicine
Volume25
Issue number8
DOIs
Publication statusPublished - Aug 2023

Open Access - Access Right Statement

Published by Elsevier Inc. on behalf of American College of Medical Genetics and Genomics. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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