Randomized Controlled Clinical Study to Assess the Benefit of Non-invasive PGT-A, by the Analysis of Spent Blastocyst Media, as a Tool for Embryo Prioritization in Infertile Patients Undergoing Assisted Reproduction.
试验速览
- 阶段
- 不适用
- 状态
- 终止
- 发起方
- Igenomix
- 入组人数
- 296
- 试验地点
- 16
- 主要终点
- Ongoing pregnancy rate
研究概览
简要总结
Chromosomal aneuploidies are linked with spontaneous miscarriages and abnormal offspring in human pregnancies. In addition, some types of aneuploidies are reported to prevent implantation. Thus, there is a need to identify the embryos with highest implantation potential on in vitro fertilization (IVF) programs.
Since embryo morphology and kinetics have a weak association with embryo ploidy, trophectoderm biopsy plus Next-Generation Sequencing (NGS) is becoming a very popular approach to determine the embryo chromosomal status. This technique is called Preimplantation Genetic Testing for Aneuploidy (PGT-A). Although shown to be efficient, it is invasive for the embryo, requires specific technical skills and it remains expensive. Therefore, the development of a non-invasive, rapid and cheaper method for assessing embryo ploidy status would represent a progress in the field of IVF.
The non-invasive approach has been explored by some groups that analyzed the Spent Blastocyst Medium (SBM) where the embryo was incubated up to the time of transfer or freezing. In daily routine, this media is discarded after finishing the culture of the embryo. Importantly, though, this media reportedly contains traces of embryonic cell-free DNA (cfDNA) that can represent the genetic load of the embryo.
On the basis of that, the hypothesis of this study is that embryo prioritization according to the analysis of the embryonic cfDNA in the SBM could improve ongoing pregnancy rate in 10 percentual points compared to standard blastocyst transfer based on morphology.
详细描述
Current Preimplantation Genetic Testing for Aneuploidy (PGT-A) techniques analyze the full chromosome content of a single or few cells with high sensitivity and specificity using Next-Generation Sequencing (NGS). Although shown to be efficient, the technique suffers from some limitations. It requires an embryo biopsy, specific technical skills and it still remains expensive. Therefore, non-invasive techniques for assessing embryo ploidy status are sought as an alternative. Such non-invasive approaches would have various advantages over current strategies, including the elimination of a costly micromanipulation biopsy procedure and the avoidance of risks associated with cell removal. Furthermore, it would be more advantageous, especially for those patients who undergo in vitro fertilization (IVF) treatment but do not have PGT-A indication or they are not willing to have their embryos tested with invasive techniques.
One of the recent advances in the field is the identification of embryonic cell-free DNA (cfDNA) during embryo culture in the lab. It is released to the culture drop (SBM) and represents the chromosome content of the embryo. In a recent pilot study, we analyzed the concordance rates between trophectoderm (TE) biopsy and SBM. In SBM collected on day 6/7 of development, the results were concordant with TE biopsies in 84% of samples, with a false-positive rate of 8.6% and a false-negative rate of 2.5%. These findings are encouraging and were the base for the design of the current RCT study.
The main objective of this study is to evaluate the potential clinical benefits of a new non-invasive method for PGT-A, based on the analysis of the embryonic cfDNA released into SBM.
Considering a dropout rate of around 30% (mainly due to treatment or monitoring failures and no day 6/7 blastocysts to transfer), a total of 1108 participants will be randomized before the ovum pick-up. They will be allocated on a balanced way (1:1 ratio) in one of the two arms: 1) Deferred transfer of a single frozen day 6/7 blastocyst which selection was based on the chromosomal status according to the analysis of the SBM; 2) Deferred transfer of a single frozen day 6/7 blastocyst which selection was based on standard embryo morphology (Gardner criteria). Reproductive outcomes (defined following The International Glossary on Infertility and Fertility Care, 2017) will be compared between the two groups.
As this is an open study, both physician and patient will receive the results of the analysis of the culture media. The control group will also have access to these results but at the end of their participation in the study and if she or her physician request it. Additional tests of chromosomal abnormalities (NIPT and POC) could be performed (with no extra cost) under request to ensure patient´s safety and efficacy of the SBM analysis.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Diagnostic
- 盲法
- None
入排标准
- 年龄范围
- 20 Years 至 40 Years（Adult）
- 性别
- Female
- 接受健康志愿者
- 否
入选标准
- •Patients whose written informed consent approved by the Ethics Committee (EC) has been obtained, after having been duly informed of the nature of the study and voluntarily accepted to participate after being fully aware of the potential risks, benefits and any discomfort involved.
- •IVF patients intending to undergo deferred day 6/7 blastocyst SET for any medical indication.
- •All the oocytes/embryos from the cycle should follow the laboratory protocol described in the study (embryo culture and vitrification on day 6/7).
- •ICSI, IVF or ICSI/IVF performed in fresh own oocytes from couples not undergoing PGT-A. Note: Donor sperm is allowed.
- •Female age: 20-40 years, both included.
排除标准
- •Assisted hatching and artificial collapse before collecting SBM samples. Note: Both procedures are allowed only after collecting the culture media sample.
- •A known abnormal karyotype if the couple provides it at consultation. If not, karyotype is not compulsory.
- •Couples planning to undergo PGT-M or PGT-SR cases will be excluded.
- •Surrogate pregnancy (in those countries where it is allowed).
- •ERA test and embryo transfer according to ERA result.
- •Time-lapse culture systems are not allowed after day 4 of culture.
- •Presence of pathologies or malformations that affect the uterine cavity such as polyps, intramural myomas ≥ 4cm or submucosal, septum or hydrosalpinx during the patient's participation in the study. Patients suffering these pathologies before or after their inclusion in the study can participate if the pathology is corrected before performing any study procedure.
- •Any illness or medical condition that is unstable or which, according to medical criteria, may put at risk the patient's safety and her compliance in the study.
结局指标
主要结局
Ongoing pregnancy rate
时间窗: Over 12 weeks
Number of ongoing pregnancies per single embryo transfer
Non-invasive analysis of the chromosomal status of the embryo
时间窗: 7 days
Number and structure of the embryo chromosomes
次要结局
- Time to get an ongoing pregnancy(Up to 6 months after the ovum pick-up)
- Analysis of the Products of Conception (POC)(Up to 20 weeks)
- Cumulative ongoing pregnancy rate(Over 6 months after the ovum pick-up)
- Live birth rate(Over 40 weeks)
- NGS results of the SBM(7 days at least)
- Clinical miscarriage rate(Up to 6 months after the ovum pick-up)
- Cumulative live birth rate(Over 6 months after the ovum pick-up)
- Non-Invasive Prenatal Testing (NIPT)(Up to 12 weeks)
- Obstetrical outcomes comparison(Over 40 weeks)