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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Tang, Rebecca Y. K. Zhang, Xiuqing Lam, Helena Tang, Mary H. Y. Nicolaides, Kypros H. Chiu, Rossa W. K. Minekawa, Ryoko To, William W. K. Leung, Wing C. Wang, Jun Au-yeung, Sidney K. C. Lo, Y. M. Dennis Lau, Tze K. Zheng, Yama W. L. Leung, Tak Y. Oudejans, Cees B. M. Akolekar, Ranjit Lun, Fiona M. F. Kung, Yu Y. Go, Attie T. J. I. Van Vugt, John M. G. Chan, K. C. Allen Sun, Hao Lau, Elizabeth T. |
| Description | Author Affiliation: Chiu RW ( Centre for Research into Circulating Fetal Nucleic Acids, Li Ka Shing Institute of Health Sciences, Department of Chemical Pathology, The Chinese University of Hong Kong, Hong Kong SAR, China.); |
| Abstract | Objectives To validate the clinical efficacy and practical feasibility of massively parallel maternal plasma DNA sequencing to screen for fetal trisomy 21 among high risk pregnancies clinically indicated for amniocentesis or chorionic villus sampling. Design Diagnostic accuracy validated against full karyotyping, using prospectively collected or archived maternal plasma samples. Setting Prenatal diagnostic units in Hong Kong, United Kingdom, and the Netherlands. Participants 753 pregnant women at high risk for fetal trisomy 21 who underwent definitive diagnosis by full karyotyping, of whom 86 had a fetus with trisomy 21. Intervention Multiplexed massively parallel sequencing of DNA molecules in maternal plasma according to two protocols with different levels of sample throughput: 2-plex and 8-plex sequencing. Main outcome measures Proportion of DNA molecules that originated from chromosome 21. A trisomy 21 fetus was diagnosed when the z score for the proportion of chromosome 21 DNA molecules was >3. Diagnostic sensitivity, specificity, positive predictive value, and negative predictive value were calculated for trisomy 21 detection. Results Results were available from 753 pregnancies with the 8-plex sequencing protocol and from 314 pregnancies with the 2-plex protocol. The performance of the 2-plex protocol was superior to that of the 8-plex protocol. With the 2-plex protocol, trisomy 21 fetuses were detected at 100% sensitivity and 97.9% specificity, which resulted in a positive predictive value of 96.6% and negative predictive value of 100%. The 8-plex protocol detected 79.1% of the trisomy 21 fetuses and 98.9% specificity, giving a positive predictive value of 91.9% and negative predictive value of 96.9%. Conclusion Multiplexed maternal plasma DNA sequencing analysis could be used to rule out fetal trisomy 21 among high risk pregnancies. If referrals for amniocentesis or chorionic villus sampling were based on the sequencing test results, about 98% of the invasive diagnostic procedures could be avoided. |
| ISSN | 09598138 |
| e-ISSN | 17561833 |
| Journal | BMJ (British Medical Journal) |
| Volume Number | 342 |
| Language | English |
| Publisher | British Medical Journal Publishing Group |
| Publisher Date | 2011-01-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Down Syndrome Diagnosis Prenatal Diagnosis Sequence Analysis, DNA Case-Control Studies DNA Blood Karyotyping Maternal Age Pregnancy ROC Curve Sensitivity And Specificity Sex Determination Processes Multicenter Study Validation Studies Medicine |
| Content Type | Text |
| Resource Type | Article |
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