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Espinoza J, Calsavara VF, Kilpatrick S, Rana S, Costantine MM, Boggess K, Wylie BJ, Moore Simas TA, Louis JM, Gaw SL, Murtha A, Wiegand S, Gollin Y, Singh D, Silver RM, Durie DE, Panda B, Norwitz ER, Burd I, Plunkett B, Scott RK, Lemoine E, Thadhani R, Karumanchi SA. Plasma soluble fms-like tyrosine kinase 1 to placental growth factor ratio of 11.5 multiples of median predicts preeclampsia with severe features within 2 weeks of testing. Am J Obstet Gynecol 2024; 231:363.e1-363.e11. [PMID: 38825028 DOI: 10.1016/j.ajog.2024.05.050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 05/28/2024] [Accepted: 05/28/2024] [Indexed: 06/04/2024]
Abstract
BACKGROUND Angiogenic imbalances, characterized by an excess of antiangiogenic factors (soluble fms-like tyrosine kinase 1) and reduced angiogenic factors (vascular endothelial growth factor and placental growth factor), contribute to the mechanisms of disease in preeclampsia. The ratio of soluble fms-like tyrosine kinase 1 to placental growth factor has been used as a biomarker for preeclampsia, but the cutoff values may vary with gestational age and assay platform. OBJECTIVE This study aimed to compare multiples of the median of the maternal plasma soluble fms-like tyrosine kinase 1 to placental growth factor ratio, soluble fms-like tyrosine kinase 1, placental growth factor, and conventional clinical and laboratory values in their ability to predict preeclampsia with severe features. STUDY DESIGN We conducted a cohort study across 18 United States centers involving hospitalized individuals with hypertension between 23 and 35 weeks' gestation. Receiver operating characteristic curve analyses of maternal plasma biomarkers, highest systolic or diastolic blood pressures, and laboratory values at enrollment were performed for the prediction of preeclampsia with severe features. The areas under the curve were compared, and quasi-Poisson regression models were fitted to estimate relative risks. The primary outcome was preeclampsia with severe features within 2 weeks of enrollment. Secondary outcomes were a composite of severe adverse maternal outcomes (elevated liver enzymes, low platelets count, placental abruption, eclampsia, disseminated intravascular coagulation, and pulmonary edema) and a composite of severe adverse perinatal outcomes (birth weight below the third percentile, very preterm birth [<32 weeks' gestation], and fetal or neonatal death). RESULTS Of the 543 individuals included in the study, preeclampsia with severe features within 2 weeks was observed in 33.1% (n=180) of them. A receiver operating characteristic curve-derived cutoff of 11.5 multiples of the median for the soluble fms-like tyrosine kinase 1 to placental growth factor plasma ratio provided good sensitivity (90.6%), specificity (76.9%), positive predictive value (66.0%), negative predictive value (94.3%), positive likelihood ratio (3.91), negative likelihood ratio (0.12), and accuracy (81.4%) for preeclampsia with severe features within 2 weeks. This cutoff was used to compare test positive cases (≥ cutoff) and test negative cases (< cutoff). Preeclampsia with severe features (66.0% vs 5.7%; P<.001) and composites of severe adverse maternal (8.11% vs 2.7%; P=.006) or perinatal (41.3% vs 10.14%; P=.001) outcomes within 2 weeks were more frequent in test positive cases than in test negative cases. A soluble fms-like tyrosine kinase 1 to placental growth factor plasma ratio ≥11.5 multiples of the median was independently associated with preeclampsia with severe features (adjusted incidence rate ratio, 9.08; 95% confidence interval, 6.11-14.06; P<.001) and a composite of severe adverse perinatal outcomes (adjusted incidence rate ratio, 9.42; 95% confidence interval, 6.36-14.53; P<.001) but not with a composite of severe adverse maternal outcomes (adjusted incidence rate ratio, 2.20; 95% confidence interval, 0.95-5.54; P=.08). The area under the curve for the soluble fms-like tyrosine kinase 1 to placental growth factor plasma ratio in multiples of the median (0.91; 95% confidence interval, 0.89-0.94) for preeclampsia with severe features within 2 weeks was significantly higher (P<.001 for all comparisons) than either plasma biomarker alone or any other parameter with the exception of absolute soluble fms-like tyrosine kinase 1 to placental growth factor plasma ratio values. CONCLUSION A soluble fms-like tyrosine kinase 1 to placental growth factor plasma ratio ≥11.5 multiples of the mean among hospitalized patients with hypertension between 23 and 35 week's gestation predicts progression to preeclampsia with severe features and severe adverse perinatal outcomes within 2 weeks.
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Affiliation(s)
- Jimmy Espinoza
- Division of Fetal Intervention, Department of Obstetrics, Gynecology and Reproductive Sciences, McGovern Medical School, University of Texas Health Science Center, Houston, TX.
| | - Vinicius F Calsavara
- Department of Computational Biomedicine, Cedars-Sinai Medical Center, Los Angeles, CA
| | - Sarah Kilpatrick
- Department of Obstetrics and Gynecology at Cedars-Sinai Medical Center, Santa Monica, CA
| | - Sarosh Rana
- Section of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Chicago Medical Center, Chicago, IL
| | - Maged M Costantine
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - Kim Boggess
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC
| | - Blair J Wylie
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Columbia University, New York, NY
| | - Tiffany A Moore Simas
- Departments of Obstetrics and Gynecology, Pediatrics, Psychiatry, and Population and Quantitative Health Sciences, UMass Chan Medical School, Worcester, MA; Department of Obstetrics and Gynecology, UMass Memorial Health - UMass Memorial Medical Center, Worcester, MA
| | - Judette M Louis
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of South Florida, Tampa, FL
| | - Stephanie L Gaw
- Division of Maternal-Fetal Medicine and Reproductive Genetics, Department of Obstetrics and Gynecology, University of California at San Francisco, San Francisco, CA
| | - Amy Murtha
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of California at San Francisco, San Francisco, CA
| | - Samantha Wiegand
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Miami Valley Hospital, Dayton, OH
| | - Yvonne Gollin
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Sharp Mary Birch Hospital for Women and Newborns, San Diego, CA
| | - Deepjot Singh
- Department of Obstetrics and Gynecology, Torrance Memorial Medical Center, Torrance, CA
| | - Robert M Silver
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Utah Medical Center, Salt Lake City, UT
| | - Danielle E Durie
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, PA
| | - Britta Panda
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Tufts Medical Center, Boston, MA
| | - Errol R Norwitz
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Tufts Medical Center, Boston, MA; Department of Obstetrics and Gynecology, Newton-Wellesley Hospital, Newton, MA
| | - Irina Burd
- Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology & Reproductive Sciences, Johns Hopkins Medical Center, Baltimore, MD
| | - Beth Plunkett
- Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology, NorthShore University Health System (Endeavor Health), Evanston, IL
| | - Rachel K Scott
- Department of Obstetrics and Gynecology, MedStar Health Research Institute, Washington, DC
| | - Elizabeth Lemoine
- Department of Obstetrics and Gynecology at University of North Carolina School of Medicine, Chapel Hill, NC
| | | | - S Ananth Karumanchi
- Department of Obstetrics and Gynecology at Cedars-Sinai Medical Center, Santa Monica, CA; Department of Medicine, Cedars-Sinai Medical Center, Santa Monica, CA
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Chen CP, Wang LK, Chern SR, Wu PS, Chen SW, Wu FT, Lee CC, Chen LF, Wang W. Prenatal diagnosis and molecular cytogenetic characterization of mosaic ring chromosome 21 associated with low PAPP-A and low PlGF in the first-trimester maternal serum screening. Taiwan J Obstet Gynecol 2022; 61:359-363. [PMID: 35361402 DOI: 10.1016/j.tjog.2022.02.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/13/2021] [Indexed: 11/30/2022] Open
Abstract
OBJECTIVE We present diagnosis and molecular cytogenetic characterization of mosaic ring chromosome 21 [r(21)]. CASE REPORT A 17-year-old, gravida 2, para 1, woman underwent amniocentesis at 17 weeks of gestation because of an abnormal result of the first-trimester maternal serum screening for Down syndrome with a free β-hCG level of 1.736 multiples of the median (MoM), a pregnancy associated plasma protein-A (PAPP-A) level of 0.275 MoM, a placental growth factor (PlGF) level of 0.281 MoM, a Down syndrome risk of 1:222 and a preeclampsia risk of 1:175. Cytogenetic analysis of cultured amniocytes revealed the result of 46,XX,r(21) (p12q22.3)[19]/45,XX,-21[13]. Array comparative genomic hybridization (aCGH) analysis of cultured amniocytes revealed the result of arr [GRCh37] 21q11.2q22.2 (15,485,008-40,625,594) × 1∼2, 21q22.2q22.3 (40,703,792-46,682,184) × 2∼3, 21q22.3 (46,761,631-48,084,156) × 1, consistent with mosaic monosomy 21 and r(21) (p12q22.3). The pregnancy was subsequently terminated, and a malformed fetus was delivered with low-set ears and hypotelorism. Postnatal cytogenetic analysis revealed a karyotype of 46,XX,r(21) (p12q22.3)[30]/45,XX,-21[8]/46,XX,idic r(21) (p12q22.3)[2] in the cord blood, 46,XX,r(21) (p12q22.3)[34]/45,XX,-21[6] in the skin, 46,XX,r(21) (p12q22.3)[37]/45,XX,-21[3] in the umbilical cord and 46,XX,dup(21) (q22.2q22.3)[32]/46,XX,r(21) (p12q22.3)[8] in the placenta. aCGH analysis of cord blood revealed the result of arr 21q11.2q22.2 (15,499,847-40,662,581) × 2.3, arr 21q22.2q22.3 (40,703,792-46,682,184) × 3.6, arr 21q22.3 (46,761,632-48,090,317) × 1, consistent with mosaic duplication of 21q11.2-q22.2 and 21q22.2-q22.3, and a 1.33-Mb 21q22.3 deletion encompassing the genes of COL18A1, SLC19A1, PCBP3, COL6A1, COL6A2, FTCD, LSS, MCM3AP, YBEY, PCNT, DIP2A, S100B and PRMT2. CONCLUSION Mosaic r(21) at amniocentesis may be associated with monosomy 21, idic r(21) and dup(21), and low PAPP-A and low PlGF in the first-trimester maternal serum screening.
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Affiliation(s)
- Chih-Ping Chen
- Department of Obstetrics and Gynecology, MacKay Memorial Hospital, Taipei, Taiwan; Department of Medical Research, MacKay Memorial Hospital, Taipei, Taiwan; School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung, Taiwan; Institute of Clinical and Community Health Nursing, National Yang Ming Chiao Tung University, Taipei, Taiwan; Department of Obstetrics and Gynecology, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan.
| | - Liang-Kai Wang
- Department of Obstetrics and Gynecology, MacKay Memorial Hospital, Taipei, Taiwan
| | - Schu-Rern Chern
- Department of Medical Research, MacKay Memorial Hospital, Taipei, Taiwan
| | | | - Shin-Wen Chen
- Department of Obstetrics and Gynecology, MacKay Memorial Hospital, Taipei, Taiwan
| | - Fang-Tzu Wu
- Department of Obstetrics and Gynecology, MacKay Memorial Hospital, Taipei, Taiwan
| | - Chen-Chi Lee
- Department of Obstetrics and Gynecology, MacKay Memorial Hospital, Taipei, Taiwan
| | - Li-Feng Chen
- Department of Obstetrics and Gynecology, MacKay Memorial Hospital, Taipei, Taiwan
| | - Wayseen Wang
- Department of Medical Research, MacKay Memorial Hospital, Taipei, Taiwan
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Mazer Zumaeta A, Wright A, Syngelaki A, Maritsa VA, Bardani E, Nicolaides KH. Screening for trisomy at 11-13 weeks' gestation: use of pregnancy-associated plasma protein-A, placental growth factor or both. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2020; 56:408-415. [PMID: 32621353 DOI: 10.1002/uog.22140] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 06/24/2020] [Indexed: 06/11/2023]
Abstract
OBJECTIVE Serum pregnancy-associated plasma protein-A (PAPP-A) and placental growth factor (PlGF) at 11-13 weeks' gestation are reduced in pregnancies with fetal trisomy and in those that subsequently develop pre-eclampsia (PE). In screening for trisomy, the established biochemical marker is PAPP-A, whereas in screening for PE, the preferred marker is PlGF. The objective of this study was to examine the impact of replacing PAPP-A by PlGF in first-trimester screening for trisomies 21, 18 and 13 by maternal age, fetal nuchal translucency thickness (NT) and free β-human chorionic gonadotropin (β-hCG). METHODS This was a prospective screening study in singleton pregnancies for trisomies 21, 18 and 13 by a combination of maternal age, fetal NT and serum PAPP-A and free β-hCG at 11-13 weeks' gestation in which we also measured PlGF. Multiples of the median (MoM) values were calculated for PAPP-A, free β-hCG and PlGF. The dataset was split randomly into training and test datasets of roughly equal size, and the parameters for PlGF obtained from the training dataset were used in risk calculation for the test dataset. Standardized detection rates were computed by obtaining the likelihood ratios for biochemistry and fetal NT for trisomy-21, -18 and -13 pregnancies in the sample and then applying these to each year of maternal age from 12 to 50 to estimate the age-specific detection rates. These were then weighted according to the maternal age distributions of trisomy-21, -18 and -13 pregnancies in England and Wales in 2018. Similarly, standardized false-positive rates (FPR) were computed by obtaining the likelihood ratios for biochemistry and NT, as appropriate, in normal pregnancies in the sample and then applying these to each year of maternal age from 12 to 50 to estimate the age-specific FPRs. A modeling approach was used to assess the performance of screening according to gestational age at biochemical testing. RESULTS The study population of 71 266 pregnancies included 70 858 (99.4%) with normal fetal karyotype or birth of a phenotypically normal neonate and 263 with trisomy 21, 109 with trisomy 18 and 36 with trisomy 13. There are five main findings of this study. First, the performance of screening for trisomy by the first-trimester combined test or the combined test in which PAPP-A is replaced by PlGF is substantially better at 11 than at 13 weeks' gestation; for example, the detection rates of trisomy 21 by the combined test were 94%, 90% and 84%, at 5% FPR, when testing was carried out at 11, 12 and 13 weeks, respectively, and the corresponding values in screening by a test in which PAPP-A is replaced by PlGF were 90%, 87% and 86%, respectively. Second, in trisomy-21 pregnancies, the deviation of median PAPP-A MoM from normal decreases with increasing gestational age, whereas the deviation in PlGF does not change with gestational age. Third, the performance of screening for trisomy 21 during the 11th and 12th gestational weeks is superior if screening includes PAPP-A rather than PlGF, whereas during the 13th week the performance is slightly higher with the use of PlGF rather than PAPP-A. Fourth, in our population with mean gestational age at testing of 12.7 weeks, screening by maternal age, fetal NT, serum free β-hCG and serum PAPP-A predicted 88%, 96% and 97% of cases of fetal trisomies 21, 18 and 13, respectively, at a FPR of 5%; the respective values in screening by a test in which PAPP-A is replaced by PlGF were 85%, 96% and 96%. Fifth, addition of serum PlGF does not improve the prediction of trisomy provided by maternal age, fetal NT and serum free β-hCG and PAPP-A. CONCLUSION In first-trimester screening for trisomy, the preferred biochemical marker is PAPP-A rather than PlGF, especially when biochemical testing is carried out during the 11th week of gestation or earlier. However, if PlGF was to be used rather than PAPP-A, the same detection rate can be achieved but at a higher FPR. This may be an acceptable compromise to minimize cost and achieve effective screening for both trisomy and PE. © 2020 International Society of Ultrasound in Obstetrics and Gynecology.
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Affiliation(s)
- A Mazer Zumaeta
- Harris Birthright Research Centre for Fetal Medicine, King's College Hospital, London, UK
| | - A Wright
- Institute of Health Research, University of Exeter, Exeter, UK
| | - A Syngelaki
- Harris Birthright Research Centre for Fetal Medicine, King's College Hospital, London, UK
| | - V A Maritsa
- Harris Birthright Research Centre for Fetal Medicine, King's College Hospital, London, UK
| | - E Bardani
- Harris Birthright Research Centre for Fetal Medicine, King's College Hospital, London, UK
| | - K H Nicolaides
- Harris Birthright Research Centre for Fetal Medicine, King's College Hospital, London, UK
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Badeghiesh A, Volodarsky-Perel A, Lasry A, Hemmings R, Gil Y, Balayla J. Use of Placental Growth Factor for Trisomy 21 Screening in Pregnancy: A Systematic Review. AJP Rep 2020; 10:e234-e240. [PMID: 33094011 PMCID: PMC7571571 DOI: 10.1055/s-0040-1713785] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2020] [Accepted: 03/05/2020] [Indexed: 11/03/2022] Open
Abstract
Background Prenatal serum screening is an important modality to screen for aneuploidy in pregnancy. The addition of placental growth factor (PLGF) to screen for trisomy 21 remains controversial. Objective To determine whether the addition of PLGF to combined serum aneuploidy screening improves detection rates (DRs) for trisomy 21. Study Design We performed a systematic review of the literature until October 2019 to determine the benefits of adding PLGF to prenatal screening. We performed a goodness-of-fit test and retrieved the coefficient of determinations ( R 2 ) as a function of false positive rates (FPRs), providing mean-weighted improvements in the DRs after accounting for PLGF levels. Results We identified 51 studies, of which 8 met inclusion criteria (834 aneuploidy cases and 105,904 euploid controls). DRs were proportional to FPR across all studies, ranging from 59.0 to 95.3% without PLGF and 61.0 to 96.3% with PLGF (FPR 1-5%). Goodness-of-fit regression analysis revealed a logarithmic distribution of DRs as a function of the FPR, with R 2 = 0.109 (no PLGF) and R 2 = 0.06 (PLGF). Two-sample Kolmogorov-Smirnov's test reveals a p -value of 0.44. Overall, addition of PLGF improves DRs of 3.3% for 1% FPR, 1.7% for 3% FPR, and 1.4% for 5% FPR, respectively. Conclusion Addition of PLGF to prenatal screening using serum analytes mildly improves trisomy 21 DRs as a function of FPRs.
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Affiliation(s)
- Ahmad Badeghiesh
- Department of Obstetrics and Gynecology, McGill University, Montreal, Quebec, Canada
| | - Alexander Volodarsky-Perel
- Department of Obstetrics and Gynecology, McGill University, Montreal, Quebec, Canada.,Lady Davis Research Institute, Jewish General Hospital, Montreal, Quebec, Canada
| | - Ariane Lasry
- Department of Obstetrics and Gynecology, McGill University, Montreal, Quebec, Canada
| | - Robert Hemmings
- Department of Obstetrics and Gynecology, McGill University, Montreal, Quebec, Canada.,Department of Obstetrics and Gynecology, CIUSS Ouest de l'Ile, Montreal, Quebec, Canada
| | - Yaron Gil
- Department of Obstetrics and Gynecology, McGill University, Montreal, Quebec, Canada
| | - Jacques Balayla
- Department of Obstetrics and Gynecology, McGill University, Montreal, Quebec, Canada
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Alldred SK, Takwoingi Y, Guo B, Pennant M, Deeks JJ, Neilson JP, Alfirevic Z. First trimester ultrasound tests alone or in combination with first trimester serum tests for Down's syndrome screening. Cochrane Database Syst Rev 2017; 3:CD012600. [PMID: 28295158 PMCID: PMC6464518 DOI: 10.1002/14651858.cd012600] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Down's syndrome occurs when a person has three, rather than two copies of chromosome 21; or the specific area of chromosome 21 implicated in causing Down's syndrome. It is the commonest congenital cause of mental disability and also leads to numerous metabolic and structural problems. It can be life-threatening, or lead to considerable ill health, although some individuals have only mild problems and can lead relatively normal lives. Having a baby with Down's syndrome is likely to have a significant impact on family life.Non-invasive screening based on biochemical analysis of maternal serum or urine, or fetal ultrasound measurements, allows estimates of the risk of a pregnancy being affected and provides information to guide decisions about definitive testing.Before agreeing to screening tests, parents need to be fully informed about the risks, benefits and possible consequences of such a test. This includes subsequent choices for further tests they may face, and the implications of both false positive and false negative screening tests (i.e. invasive diagnostic testing, and the possibility that a miscarried fetus may be chromosomally normal). The decisions that may be faced by expectant parents inevitably engender a high level of anxiety at all stages of the screening process, and the outcomes of screening can be associated with considerable physical and psychological morbidity. No screening test can predict the severity of problems a person with Down's syndrome will have. OBJECTIVES To estimate and compare the accuracy of first trimester ultrasound markers alone, and in combination with first trimester serum tests for the detection of Down's syndrome. SEARCH METHODS We carried out extensive literature searches including MEDLINE (1980 to 25 August 2011), Embase (1980 to 25 August 2011), BIOSIS via EDINA (1985 to 25 August 2011), CINAHL via OVID (1982 to 25 August 2011), and The Database of Abstracts of Reviews of Effects (the Cochrane Library 2011, Issue 7). We checked reference lists and published review articles for additional potentially relevant studies. SELECTION CRITERIA Studies evaluating tests of first trimester ultrasound screening, alone or in combination with first trimester serum tests (up to 14 weeks' gestation) for Down's syndrome, compared with a reference standard, either chromosomal verification or macroscopic postnatal inspection. DATA COLLECTION AND ANALYSIS Data were extracted as test positive/test negative results for Down's and non-Down's pregnancies allowing estimation of detection rates (sensitivity) and false positive rates (1-specificity). We performed quality assessment according to QUADAS criteria. We used hierarchical summary ROC meta-analytical methods to analyse test performance and compare test accuracy. Analysis of studies allowing direct comparison between tests was undertaken. We investigated the impact of maternal age on test performance in subgroup analyses. MAIN RESULTS We included 126 studies (152 publications) involving 1,604,040 fetuses (including 8454 Down's syndrome cases). Studies were generally good quality, although differential verification was common with invasive testing of only high-risk pregnancies. Sixty test combinations were evaluated formed from combinations of 11 different ultrasound markers (nuchal translucency (NT), nasal bone, ductus venosus Doppler, maxillary bone length, fetal heart rate, aberrant right subclavian artery, frontomaxillary facial angle, presence of mitral gap, tricuspid regurgitation, tricuspid blood flow and iliac angle 90 degrees); 12 serum tests (inhibin A, alpha-fetoprotein (AFP), free beta human chorionic gonadotrophin (ßhCG), total hCG, pregnancy-associated plasma protein A (PAPP-A), unconjugated oestriol (uE3), disintegrin and metalloprotease 12 (ADAM 12), placental growth factor (PlGF), placental growth hormone (PGH), invasive trophoblast antigen (ITA) (synonymous with hyperglycosylated hCG), growth hormone binding protein (GHBP) and placental protein 13 (PP13)); and maternal age. The most frequently evaluated serum markers in combination with ultrasound markers were PAPP-A and free ßhCG.Comparisons of the 10 most frequently evaluated test strategies showed that a combined NT, PAPP-A, free ßhCG and maternal age test strategy significantly outperformed ultrasound markers alone (with or without maternal age) except nasal bone, detecting about nine out of every 10 Down's syndrome pregnancies at a 5% false positive rate (FPR). In both direct and indirect comparisons, the combined NT, PAPP-A, free ßhCG and maternal age test strategy showed superior diagnostic accuracy to an NT and maternal age test strategy (P < 0.0001). Based on the indirect comparison of all available studies for the two tests, the sensitivity (95% confidence interval) estimated at a 5% FPR for the combined NT, PAPP-A, free ßhCG and maternal age test strategy (69 studies; 1,173,853 fetuses including 6010 with Down's syndrome) was 87% (86 to 89) and for the NT and maternal age test strategy (50 studies; 530,874 fetuses including 2701 Down's syndrome pregnancies) was 71% (66 to 75). Combinations of NT with other ultrasound markers, PAPP-A and free ßhCG were evaluated in one or two studies and showed sensitivities of more than 90% and specificities of more than 95%.High-risk populations (defined before screening was done, mainly due to advanced maternal age of 35 years or more, or previous pregnancies affected with Down's syndrome) showed lower detection rates compared to routine screening populations at a 5% FPR. Women who miscarried in the over 35 group were more likely to have been offered an invasive test to verify a negative screening results, whereas those under 35 were usually not offered invasive testing for a negative screening result. Pregnancy loss in women under 35 therefore leads to under-ascertainment of screening results, potentially missing a proportion of affected pregnancies and affecting test sensitivity. Conversely, for the NT, PAPP-A, free ßhCG and maternal age test strategy, detection rates and false positive rates increased with maternal age in the five studies that provided data separately for the subset of women aged 35 years or more. AUTHORS' CONCLUSIONS Test strategies that combine ultrasound markers with serum markers, especially PAPP-A and free ßhCG, and maternal age were significantly better than those involving only ultrasound markers (with or without maternal age) except nasal bone. They detect about nine out of 10 Down's affected pregnancies for a fixed 5% FPR. Although the absence of nasal bone appeared to have a high diagnostic accuracy, only five out of 10 affected Down's pregnancies were detected at a 1% FPR.
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Affiliation(s)
- S Kate Alldred
- The University of LiverpoolDepartment of Women's and Children's HealthFirst Floor, Liverpool Women's NHS Foundation TrustCrown StreetLiverpoolUKL8 7SS
| | - Yemisi Takwoingi
- University of BirminghamInstitute of Applied Health ResearchEdgbastonBirminghamUKB15 2TT
| | - Boliang Guo
- University of NottinghamSchool of MedicineCLAHRC, C floor, IHM, Jubilee CampusUniversity of Nottingham, Triumph RoadNottinghamEast MidlandsUKNG7 2TU
| | - Mary Pennant
- Cambridgeshire County CouncilPublic Health DirectorateCambridgeUK
| | - Jonathan J Deeks
- University of BirminghamInstitute of Applied Health ResearchEdgbastonBirminghamUKB15 2TT
| | | | - Zarko Alfirevic
- The University of LiverpoolDepartment of Women's and Children's HealthFirst Floor, Liverpool Women's NHS Foundation TrustCrown StreetLiverpoolUKL8 7SS
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Tørring N. First trimester combined screening – focus on early biochemistry. Scandinavian Journal of Clinical and Laboratory Investigation 2016; 76:435-47. [DOI: 10.1080/00365513.2016.1200131] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Niels Tørring
- Department of Clinical Biochemistry, Aarhus University Hospital, Aarhus, Denmark
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Schneuer FJ, Bower C, Holland AJA, Tasevski V, Jamieson SE, Barker A, Lee L, Majzoub JA, Nassar N. Maternal first trimester serum levels of free-beta human chorionic gonadotrophin and male genital anomalies. Hum Reprod 2016; 31:1895-903. [PMID: 27496947 DOI: 10.1093/humrep/dew150] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Accepted: 05/26/2016] [Indexed: 02/06/2023] Open
Abstract
STUDY QUESTION Are maternal first trimester levels of serum free-beta hCG associated with the development of hypospadias or undescended testis (UDT) in boys? SUMMARY ANSWER Overall, first trimester maternal levels of serum free-beta hCG are not associated with hypospadias or UDT. However, elevated levels were found in severe phenotypes (proximal hypospadias and bilateral UDT) suggesting an altered pathway of hormonal release in early pregnancy. WHAT IS KNOWN ALREADY Human chorionic gonadotrophin peaks in first trimester of pregnancy stimulating fetal testosterone production, which is key to normal male genital development. Endocrine-disrupting insults early in pregnancy have been associated with increased risk of common genital anomalies in males such as hypospadias and UDT. One plausible etiological pathway is altered release of hCG. STUDY DESIGN, SIZE, DURATION We conducted a record-linkage study of two separate populations of women attending first trimester aneuploidy screening in two Australian states, New South Wales (NSW) and Western Australia (WA), in 2006-2009 and 2001-2003, respectively. PARTICIPANTS/MATERIALS, SETTING, METHODS Included were women who gave birth to a singleton live born male infant. There were 12 099 boys from NSW and 10 518 from WA included, of whom 90 and 77 had hypospadias; and 107 and 109 UDT, respectively. Serum levels of free-beta hCG were ascertained from laboratory databases and combined with relevant birth outcomes and congenital anomalies via record linkage of laboratory, birth, congenital anomalies and hospital data. Median and quartile levels of gestational age specific free-beta hCG multiple of the median (MoM) were compared between affected and unaffected boys. Logistic regression was used to evaluate the association between levels of free-beta hCG MoM and hypospadias or UDT, stratified by suspected placental dysfunction and co-existing anomalies. Where relevant, pooled analysis was conducted. MAIN RESULTS AND THE ROLE OF CHANCE There was no difference in median hCG levels amongst women with an infant with hypospadias (NSW = 0.88 MoM, P = 0.83; WA = 0.84 MoM, P = 0.76) or UDT (NSW = 0.89 MoM, P = 0.54; WA = 0.95 MoM, P = 0.95), compared with women with an unaffected boy (NSW = 0.92 MoM; WA = 0.88 MoM). Low (<25th centile) or high (>75th centile) hCG levels were not associated with hypospadias or UDT, nor when stratifying by suspected placental dysfunction and co-existing anomalies. However, there was a tendency towards high levels for severe types, although confidence intervals were wide. When combining NSW and WA results, high hCG MoM levels (>75th centile) were associated with increased risk of proximal hypospadias (odds ratio (OR) 4.34; 95% CI: 1.08-17.4) and bilateral UDT (OR 2.86; 95% CI: 1.02-8.03). LIMITATIONS, REASONS FOR CAUTION There were only small numbers of proximal hypospadias and bilateral UDT in both cohorts and although we conducted pooled analyses, results reported on these should be interpreted with caution. Gestational age by ultrasound may have been inaccurately estimated in small and large for gestational age fetuses affecting hCG MoM calculation in those pregnancies. Despite the reliability of our datasets in identifying adverse pregnancy outcomes, we did not have pathology information to confirm tissue lesions in the placenta and therefore our composite outcome should be considered as a proxy for placental dysfunction. WIDER IMPLICATIONS OF THE FINDINGS This is one of the largest population-based studies examining the association between maternal first trimester serum levels of free-beta hCG and genital anomalies-hypospadias and UDT; and the first to compare specific phenotypes by severity. Overall, our findings does not support the hypothesis that alteration in maternal hCG levels is associated with the development of male genital anomalies; however, high hCG free-beta levels found in severe types suggest different underlying etiology involving higher production and secretion of hCG. These findings require further exploration and replication. STUDY FUNDING/COMPETING INTERESTS This work was funded by the National Health and Medical Research Council (NHMRC) grant APP1047263. N.N. is supported by a NHMRC Career Development Fellowship APP1067066. C.B. was supported by a NHMRC Principal Research Fellowship #634341. The funding agencies had no role in the design, analysis, interpretation or reporting of the findings. There are no competing interests. TRIAL REGISTRATION NUMBER Not applicable.
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Affiliation(s)
- F J Schneuer
- Menzies Centre for Health Policy, School of Public Health, University of Sydney, Sydney, NSW 2006, Australia
| | - C Bower
- Telethon Kids Institute, The University of Western Australia, Crawley, Western Australia 6009, Australia
| | - A J A Holland
- Discipline of Paediatrics and Child Health, The Children's Hospital at Westmead, Sydney Medical School, University of Sydney, Sydney, NSW 2145, Australia
| | - V Tasevski
- Pathology North, NSW Health Pathology, Royal North Shore Hospital, St Leonards, NSW 2065, Australia
| | - S E Jamieson
- Telethon Kids Institute, The University of Western Australia, Crawley, Western Australia 6009, Australia
| | - A Barker
- Department of Paediatric Surgery, Princess Margaret Hospital for Children, Subiaco, Western Australia 6008, Australia
| | - L Lee
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - J A Majzoub
- Division of Endocrinology, Boston Children's Hospital, and Harvard Medical School, CLSB 16028, 300 Longwood Avenue, Boston, MA 02115, USA
| | - N Nassar
- Menzies Centre for Health Policy, School of Public Health, University of Sydney, Sydney, NSW 2006, Australia
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Palomaki GE, Eklund EE, Neveux LM, Lambert Messerlian GM. Evaluating first trimester maternal serum screening combinations for Down syndrome suitable for use with reflexive secondary screening via sequencing of cell free DNA: high detection with low rates of invasive procedures. Prenat Diagn 2015; 35:789-96. [PMID: 25967109 DOI: 10.1002/pd.4609] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2014] [Revised: 04/22/2015] [Accepted: 04/24/2015] [Indexed: 12/15/2022]
Abstract
OBJECTIVES Examine primary Down syndrome screening using combinations of first trimester serum markers, with and without sequencing of cell free DNA as a secondary reflexive test. METHODS Samples from 40 Down syndrome cases were matched with five control samples and tested for PAPP-A, free β, AFP, inhibin-A and PlGF. Results were converted to weight-adjusted multiples of the median (MoM) and population parameters computed. Monte Carlo simulation modeled Down syndrome detection and false positive rates for various marker combinations. After reflexive DNA testing, the revised detection and false positive rates were also computed. RESULTS At a primary false positive rate of 20%, the baseline combination (maternal age, PAPP-A and free β) detected 86.9%. Adding AFP or PlGF increased detection to 89.8% and 89.5%, respectively. Adding AFP and PlGF, AFP and inhibin-A, or all three markers, detected 93.7%, 94.1% and 95.5%, respectively. Modeling reflexive cf DNA testing results in little loss in detection (1%), but false positive rates fall to 0.2%. CONCLUSION First trimester reflexive testing does not require nuchal translucency measurements, and has high detection and very low rates of invasive procedures. However, timing of DNA sample collection and the costs of sample collection and DNA testing need to be considered before implementation.
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Affiliation(s)
- Glenn E Palomaki
- Division of Medical Screening and Special Testing, Department of Pathology and Laboratory Medicine, Women and Infants Hospital, Providence, RI, USA.,Department of Pathology and Laboratory Medicine, Alpert School of Medicine, Brown University, Providence, RI, USA
| | - Elizabeth E Eklund
- Division of Medical Screening and Special Testing, Department of Pathology and Laboratory Medicine, Women and Infants Hospital, Providence, RI, USA
| | - Louis M Neveux
- Division of Medical Screening and Special Testing, Department of Pathology and Laboratory Medicine, Women and Infants Hospital, Providence, RI, USA
| | - Geralyn M Lambert Messerlian
- Division of Medical Screening and Special Testing, Department of Pathology and Laboratory Medicine, Women and Infants Hospital, Providence, RI, USA.,Department of Pathology and Laboratory Medicine, Alpert School of Medicine, Brown University, Providence, RI, USA
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9
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Huang T, Dennis A, Meschino WS, Rashid S, Mak-Tam E, Cuckle H. First trimester screening for Down syndrome using nuchal translucency, maternal serum pregnancy-associated plasma protein A, free-β human chorionic gonadotrophin, placental growth factor, and α-fetoprotein. Prenat Diagn 2015; 35:709-16. [DOI: 10.1002/pd.4597] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 02/25/2015] [Accepted: 03/26/2015] [Indexed: 12/22/2022]
Affiliation(s)
- Tianhua Huang
- Genetics Program; North York General Hospital; Toronto Ontario Canada
| | - Alan Dennis
- Genetics Program; North York General Hospital; Toronto Ontario Canada
| | - Wendy S. Meschino
- Genetics Program; North York General Hospital; Toronto Ontario Canada
- Department of Paediatrics; University of Toronto; Toronto Ontario Canada
| | - Shamim Rashid
- Genetics Program; North York General Hospital; Toronto Ontario Canada
| | - Ellen Mak-Tam
- Genetics Program; North York General Hospital; Toronto Ontario Canada
| | - Howard Cuckle
- Department of Obstetrics and Gynecology; Columbia University Medical Center; New York NY USA
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10
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Chambers AE, Mills WE, Mercadé I, Crovetto F, Crispi F, Bodi LRR, Pugia M, Mira A, Lasalvia L, Banerjee S, Casals E, Gratacos E. The utility of circulating LHCGR as a predictor of Down's syndrome in early pregnancy. BMC Pregnancy Childbirth 2014; 14:197. [PMID: 24906955 PMCID: PMC4061320 DOI: 10.1186/1471-2393-14-197] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2014] [Accepted: 05/29/2014] [Indexed: 12/11/2022] Open
Abstract
Background Previous studies showed that soluble LHCGR/hCG-sLHCGR concentrations in serum or plasma combined with PAPP-A and free βhCG significantly increased the sensitivity of Down’s syndrome screen at early pregnancy without altering the false positive rate. The goal of the present study was to further examine the role of sLHCGR forms as combinatorial markers and to investigate whether sLHCGR could serve as an independent biomarker for Down’s syndrome in first trimester pregnancy screens. Methods The PAPP-A, free βhCG, and hCG-sLHCGR concentrations together with nuchal translucency (NT) were measured in 40 Down’s and 300 control pregnancies. The sLHCGR concentration was analysed in 40 Down’s and 206 control pregnancies. Results The hCG-LHCGR in combination with PAPP-A and free βhCG increased the detection rate (DR) by 35% without altering the false positive rate (FPR). The sLHCGR: hCG-sLHCGR ratio alone detected 80% of Down’s pregnancies in first trimester screening, with a false positive rate of 0.5%. Conclusions While measurement of sLHCGR forms in combination with PAPP-A and free βhCG significantly increases the detection rate of Down’s syndrome at first trimester, the ratio of sLHCGR: hCG-sLHCGR acts as an independent marker with a detection rate that is significantly higher than the existing biochemical markers individually for prenatal first trimester screening of Down’s syndrome.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Subhasis Banerjee
- Origin Biomarkers, Biocity Scotland, Bo'Ness Road, Newhouse, Lanarkshire ML1 5UH, UK.
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11
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Jørgensen JM, Hedley PL, Gjerris M, Christiansen M. Including ethical considerations in models for first-trimester screening for pre-eclampsia. Reprod Biomed Online 2014; 28:638-43. [PMID: 24631382 DOI: 10.1016/j.rbmo.2014.01.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2012] [Revised: 11/01/2013] [Accepted: 01/22/2014] [Indexed: 10/25/2022]
Abstract
Recent efforts to develop reliable and efficient early pregnancy screening programmes for pre-eclampsia have focused on combining clinical, biochemical and biophysical markers. The same model has been used for first-trimester screening for fetal aneuploidies i.e. prenatal diagnosis (PD), which is routinely offered to all pregnant women in many developed countries. Some studies suggest combining PD and pre-eclampsia screening, so women can be offered testing for a number of conditions at the same clinical visit. A combination of these tests may be practical in terms of saving time and resources; however, the combination raises ethical issues. First-trimester PD and pre-eclampsia screening entail qualitative differences which alter the requirements for disclosure, non-directedness and consent with regard to the informed consent process. This article explores the differences related to the ethical issues raised by PD and pre-eclampsia in order to elucidate which factors are relevant to deciding the type of information and consent required in each context from the perspective of the ethical principles of beneficence and autonomy. Furthermore, it argues that ensuring respect for patient autonomy is context dependent and, consequently, pre-eclampsia screening and PD should be performed independently of one another.
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Affiliation(s)
- J M Jørgensen
- Department of Biochemistry, Immunology and Genetics, Statens Serums Institut, Copenhagen, Denmark; Department of Biomedical Sciences, University of Copenhagen, Denmark.
| | - P L Hedley
- Department of Biochemistry, Immunology and Genetics, Statens Serums Institut, Copenhagen, Denmark; Department of Biomedical Sciences, University of Stellenbosch, Cape Town, South Africa.
| | - M Gjerris
- Danish Centre for Bioethics and Risk Assessment, Institute of Food and Resource Economics, Faculty of Science, University of Copenhagen, Denmark.
| | - M Christiansen
- Department of Biochemistry, Immunology and Genetics, Statens Serums Institut, Copenhagen, Denmark.
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12
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Nucci M, Poon LC, Demirdjian G, Darbouret B, Nicolaides KH. Maternal serum placental growth factor (PlGF) isoforms 1 and 2 at 11-13 weeks' gestation in normal and pathological pregnancies. Fetal Diagn Ther 2014; 36:106-16. [PMID: 24457972 DOI: 10.1159/000357842] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 11/28/2013] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To compare the maternal serum concentration of placental growth factor-1 (PlGF-1) and PlGF-2 at 11-13 weeks' gestation in normal pregnancies and in those complicated by preeclampsia (PE), delivery of small for gestational age (SGA) neonates and fetal trisomies 21, 18 and 13. METHODS Serum PlGF-1 and PlGF-2 were measured in 270 pathological pregnancies (PE, n = 80; SGA, n = 80; trisomy 21, n = 44; trisomy 18, n = 38; trisomy 13, n = 28) and 590 normal controls. The values were expressed as multiple of the median (MoM) after adjustment for maternal characteristics and corrected for adverse pregnancy outcomes and the median MoM values in each pathological pregnancy were compared to the normal group. RESULTS There were significant contributions to PlGF-1 and PlGF-2 from gestational age, smoking and racial origin. In addition, there were significant contributions to PlGF-1 from parity and method of conception. The median MoM of PlGF-1 and PlGF-2 was significantly decreased in PE (0.783 and 0.916 MoM), SGA (0.891 and 0.851 MoM), trisomy 21 (0.609 and 0.749 MoM), trisomy 18 (0.529 and 0.730 MoM) and trisomy 13 (0.373 and 0.699 MoM). CONCLUSIONS In pathological pregnancies, except SGA, the decrease in serum PlGF-1 at 11-13 weeks' gestation is more marked than the decrease in PlGF-2.
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Affiliation(s)
- Marta Nucci
- Harris Birthright Research Centre of Fetal Medicine, King's College Hospital, London, UK
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13
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Johnson J, Pastuck M, Metcalfe A, Connors G, Krause R, Wilson D, Cuckle H. First-trimester Down syndrome screening using additional serum markers with and without nuchal translucency and cell-free DNA. Prenat Diagn 2013; 33:1044-9. [DOI: 10.1002/pd.4194] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 06/21/2013] [Accepted: 07/02/2013] [Indexed: 12/12/2022]
Affiliation(s)
- J Johnson
- Obstetrics and Gynecology; University of Calgary; Calgary AB Canada
| | - M Pastuck
- Coordinator, Early Risk Assessment Program; Calgary AB Canada
| | - A Metcalfe
- Obstetrics and Gynecology; University of British Columbia; Vancouver BC Canada
| | - G Connors
- Obstetrics and Gynecology; University of Calgary; Calgary AB Canada
| | - R Krause
- Calgary Laboratory Services; Calgary AB Canada
| | - D Wilson
- Obstetrics and Gynecology; University of Calgary; Calgary AB Canada
| | - H Cuckle
- Obstetrics and Gynecology; Columbia University Medical Center; New York NY USA
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14
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Donalson K, Turner S, Morrison L, Liitti P, Nilsson C, Cuckle H. Maternal serum placental growth factor and α
-fetoprotein testing in first trimester screening for Down syndrome. Prenat Diagn 2013; 33:457-61. [DOI: 10.1002/pd.4087] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kim Donalson
- Biochemistry Department; Royal Victoria Infirmary; Newcastle UK
| | - Steve Turner
- Biochemistry Department; Royal Victoria Infirmary; Newcastle UK
| | - Lesley Morrison
- Biochemistry Department; Royal Victoria Infirmary; Newcastle UK
| | - Päivi Liitti
- Wallac Oy; a subsidiary of PerkinElmer Inc; Turku Finland
| | | | - Howard Cuckle
- Obstetrics & Gynecology; Medical College of Columbia University; New York USA
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15
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Kagan KO, Hoopmann M, Abele H, Alkier R, Lüthgens K. First-trimester combined screening for trisomy 21 with different combinations of placental growth factor, free β-human chorionic gonadotropin and pregnancy-associated plasma protein-A. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2012; 40:530-535. [PMID: 22611005 DOI: 10.1002/uog.11173] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/30/2012] [Indexed: 06/01/2023]
Abstract
OBJECTIVE To examine placental growth factor (PlGF) in euploid and trisomy 21 pregnancies at 11-13 weeks' gestation and to model the impact on first-trimester combined screening. METHODS PlGF was measured in 509 (409 euploid and 100 trisomic) fetal serum samples derived from prospective first-trimester combined screening for trisomy 21 at 11-13 weeks' gestation. The serum samples were stored at -80°C, following the measurement of free β-human chorionic gonadotropin (β-hCG) and pregnancy-associated plasma protein-A (PAPP-A) levels, for median time spans of 0.9 and 4.1 years in the euploid and trisomy 21 pregnancies, respectively. The effect of additional PlGF measurement at the time of combined screening was investigated by simulating fetal nuchal translucency (NT) measurements and multiples of the median (MoM) values for PAPP-A, free β-hCG and PlGF for 20,000 euploid and 20,000 trisomy 21 pregnancies. Patient-specific combined risks were calculated based on maternal age and fetal NT in addition to free β-hCG, PAPP-A and PlGF, PAPP-A and PlGF or free β-hCG and PlGF, and detection and false-positive rates were calculated. RESULTS Median PlGF-MoM was 1.0 (95% confidence interval (CI), 0.96-1.04) in euploid fetuses and significantly lower, at 0.73 (95% CI, 0.70-0.76), in trisomy-21 fetuses (P < 0.0001). There was no significant dependency between PlGF-MoM and either gestational age at the time of blood sampling (r = 0.087, P = 0.392) or sample storage time (r = 0.028, P = 0.785). Modeled detection and false-positive rates for first-trimester combined screening (based on maternal and gestational age, fetal NT and maternal serum biochemistry) without PlGF were 85% and 2.7% for a fixed risk cut-off of 1:100. The addition of PlGF increased the detection rate to 87% and reduced the false-positive rate to 2.6%. Screening by maternal age and fetal NT in combination with PlGF and PAPP-A or in combination with PlGF and free β-hCG provided detection rates of 82% and 79%, with false-positive rates of 2.7% and 3.0%, respectively. CONCLUSION In pregnancies with trisomy 21 PlGF is reduced. The impact on the overall screening performance for trisomy 21 is low and does not justify the measurement of PlGF solely for trisomy 21 screening. However, as PlGF is measured with the aim of assessing the risk for pre-eclampsia, further improvement in screening for trisomy 21 can be considered as an added benefit.
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Affiliation(s)
- K O Kagan
- Department of Obstetrics and Gynecology, University of Tuebingen, Tuebingen, Germany.
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Antenatal screening for Down syndrome using serum placental growth factor with the combined, quadruple, serum integrated and integrated tests. PLoS One 2012; 7:e46955. [PMID: 23056541 PMCID: PMC3463523 DOI: 10.1371/journal.pone.0046955] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Accepted: 09/07/2012] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE To estimate the value of first or second trimester placental growth factor (PlGF) as an additional antenatal screening marker for Down syndrome. DESIGN Nested case-control study. SETTING Antenatal screening service. POPULATION OR SAMPLE 532 Down syndrome pregnancies and 1,155 matched unaffected pregnancies. METHODS Stored maternal serum samples (-40°C) were assayed for PlGF. Monte Carlo simulation was used to estimate the screening performance of PlGF with the Combined, Quadruple, serum Integrated and Integrated tests. MAIN OUTCOME MEASURES Median PlGF levels in affected and unaffected pregnancies and screening performance (detection rates [DR] for specified false-positive rates [FPR] and vice versa). RESULTS First trimester median PlGF was 15%, 28% and 39% lower in Down syndrome than unaffected pregnancies at 11, 12 and 13 completed weeks' gestation respectively (all p<0.001). Second trimester median PlGF was 31% lower at 14 weeks (p<0.001), and the difference decreased (6% lower at 17 weeks). At a 90% DR with first trimester markers measured at 13 weeks, adding PlGF decreased the FPR from 11.1 to 5.1% using the Combined test, 9.3% to 4.5% using the serum Integrated test, and 3.4% to 1.5% using the Integrated test (or 1.5 to 1.4% with first trimester markers measured at 11 weeks). Adding PlGF to the Quadruple test (measured at 15 weeks) decreased the FPR from 10.0% to 9.6% at a 90% DR. CONCLUSIONS First trimester PlGF measurements improve the performance of antenatal screening for Down syndrome using the Combined, serum Integrated and Integrated tests. Second trimester PlGF measurements are of limited value.
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Cowans NJ, Kisanga MC, Spencer K. Maternal serum placental growth factor in second trimester trisomy 21 pregnancies. Prenat Diagn 2012; 32:117-21. [PMID: 22418953 DOI: 10.1002/pd.2904] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE To investigate the levels of placental growth factor (PlGF) in second trimester maternal serum in trisomy 21 cases and euploid controls - an unclear subject in the published literature. METHODS Second trimester maternal serum samples from 17 recent (since 2005) and 74 older trisomy 21 cases and 542 euploid controls were extracted from frozen storage and retrospectively analysed for PlGF using a DELFIA Xpress immunoassay platform. Results were converted to multiples of median (MoM) for comparison. RESULTS The control group had a PlGF MoM of 0.99, the recent trisomy 21 cases had a PlGF MoM of 1.13 and the older cases a PlGF MoM of 1.11; however, the differences between trisomy 21 cases and controls were not significant. CONCLUSION Although we have found no significant change in the second trimester levels of PlGF in trisomy 21 pregnancies, there remains wide disagreement within the literature on the behaviour of this marker during pregnancies of this syndrome.
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Affiliation(s)
- N J Cowans
- Prenatal Screening Unit, Department of Clinical Biochemistry, King George Hospital, Barley Lane, Goodmayes, Essex, United Kingdom
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Pandya P, Wright D, Syngelaki A, Akolekar R, Nicolaides KH. Maternal Serum Placental Growth Factor in Prospective Screening for Aneuploidies at 8–13 Weeks’ Gestation. Fetal Diagn Ther 2012; 31:87-93. [DOI: 10.1159/000335684] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Accepted: 12/11/2011] [Indexed: 11/19/2022]
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Ranta JK, Marttala J, Laitinen P, Kultti J, Kauhanen O, Romppanen J, Hämäläinen E, Heinonen S, Pulkki K, Ryynänen M. First trimester biochemistry at different maternal ages. Clin Chem Lab Med 2012; 50:549-55. [DOI: 10.1515/cclm.2011.785] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Accepted: 10/19/2011] [Indexed: 11/15/2022]
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