Active clinical trials for "Trisomy 18 Syndrome"

The purpose of this study is to collect blood samples from women carrying a vanishing twin pregnancy to further develop Natera's non-invasive prenatal screening test to provide information about possible chromosomal conditions for the living twin

Each year, 450,000 Canadian women become pregnant and, as a result of their participation in prenatal screening for Down syndrome, approximately 10,000 of them will have an amniocentesis (i.e. sampling of liquid surrounding the fetus) and of those, 315 will be found to carry a baby with Down syndrome and 70 normal pregnancies will be lost from complications of the procedure. It has been discovered recently that, during pregnancy, there is fetal DNA in maternal blood in sufficient quantities to be analysed and methods have been proposed to detect the presence or not of a fetus with Down syndrome using maternal blood. The introduction of genomic blood testing as proposed in the context of this project could lead to increased detection of Down syndrome, less invasive screening with 9700 amniocentesis avoided each year in Canada, improving the peace of mind of pregnant women, and preventing the accidental loss of 70 normal fetuses, at a lower overall cost than current practice. However, these methods still need to be validated before being appropriately introduced in routine care. The study hypothesis is that new genomics-based non-invasive methods using fetal-DNA in maternal blood during pregnancy can be more effective than current prenatal screening methods for fetal aneuploidy. This project will carry out an independent study that will validate the performance and utility of different new genomic technologies for screening in pregnant women using maternal blood. The team of researchers will compare the real-life performance of different non-invasive assays and strategies to screen for fetal aneuploidy, and identify an evidence-based cost-effective approach for implementation of this new technology in the Canadian health care system. The deliverables of this project will enable decision makers, pregnant women and their partner to make informed choices pertaining to prenatal genetic screening and diagnosis, such as screening for Down syndrome, and reduce the risk to pregnancies associated with amniocentesis.

The purpose of this study is to evaluate the performance of the IONA® test which is a non-invasive prenatal test (NIPT) for Down's syndrome and other chromosomal abnormalities in twin pregnancies, from a maternal blood sample.

This study will evaluate the clinical performance of massively parallel sequencing (MPS) using the MaterniT21 PLUS LDT in the detection of fetal aneuploidy in circulating cfDNA extracted from a maternal blood sample obtained from women pregnant with a multiple gestation who were at increased risk for fetal aneuploidy.

This prospective blinded study will assess the diagnostic capability of an informatics enhanced SNP based technology (Parental Support) to identify pregnant women who are carrying a fetus with an aneuploidy from fee floating DNA in the maternal blood.

This study will document the detection rate and false positive rate as well as failure rate of a new prenatal screening approach ('Smart NIPT') as described at www.vanadisdx.com and implemented in an academic laboratory with limited molecular testing experience. Testing will be performed on samples from a general risk pregnancy population, with additional high-risk cases added to improve confidence in the detection rate. Additional characteristics of this non-NGS test such as turn-around time, costs (equipment, training, per test), results reporting, fetal sex, fetal fraction, and quality measures will also be examined.

The objectives of the clinical study are to demonstrate the accuracy of our new NATUS diagnostic method to determine the genetic health of the developing fetuses in a multiple gestation pregnancy from a maternal blood sample. The long term goal of this study will be the development of a method of minimally invasive prenatal diagnosis that has a higher sensitivity and lower false positive rate in the intended population (e.g. multiple gestation pregnancies) than any currently available screening tests. This will result in fewer unnecessary amniocenteses and CVS procedures, which are associated with a risk of miscarriage.

Blood samples collected will be shipped to the sponsor's laboratory to establish analytical performance characteristics of the ADVIA Centaur® Pregnancy Associated Plasma Protein A (PAPP-A) and ADVIA Centaur® Free Beta Human Chorionic Gonadotropin (Free βhCG) assays.

This study will explore how maternal plasma circulating cell free DNA (ccfDNA) can be used as a primary screening test for Down syndrome as part of routine clinical care in the general pregnancy population. Plasma ccfDNA testing is currently recommended only for use as a secondary screen for 'high-risk' women (i.e., women whose risk factors for trisomy make them candidates for invasive testing such as chorionic villous sampling or amniocentesis). Because most women in this 'high-risk' category are carrying unaffected fetuses, many 'unnecessary' procedures are completed in order to identify the few women whose fetuses have a chromosomal disorder. This creates expense, anxiety, and most importantly, loss of unaffected fetuses due to procedure related miscarriage. Plasma DNA testing is now being used to reduce significantly the number of women with unaffected fetuses undergoing invasive testing. Applying such testing as a 'first-line' screen has not been well-explored, despite calls from several clinical professional societies to do so. The investigators intent is to introduce, under carefully monitored conditions, ccfDNA testing through Rhode Island primary prenatal practices to the general pregnancy population. Education/orientation of prenatal care providers, their staffs, and their patients will be carefully orchestrated, and implementation issues identified and addressed. Telephone surveys of consented patients will elicit responses to their understanding of the test, their satisfaction with the process, and a comparison of their experience with serum screening in a prior pregnancy. Knowledge gained from this study will help validate new screening paradigms involving ccfDNA testing. The study is not designed to estimate Down syndrome detection rates with any confidence, but can provide information on uptake rates, failure rates, screen positive rates, and the decision-making of women with positive test results.

The purpose of this study is to collect maternal blood samples from pregnant women carrying a fetus with a confirmed diagnosis of chromosomal abnormality or genetic disorder including microdeletions in order to further develop a non-invasive prenatal screening test based on fetal DNA isolated from maternal blood.