Study of Pregnancy and Child Development After Transfer of Aneuploid or Mosaic Embryos Compared to Euploid Embryos
Led by Stanford University · Updated on 2026-04-24
300
Participants Needed
1
Research Sites
208 weeks
Total Duration
AI-Summary
What this Trial Is About
This research aims to understand how often embryos reported as abnormal through preimplantation genetic testing lead to live births. It also evaluates whether pregnancies from these embryos face higher risks of complications and if the children have increased risks for health or developmental issues during their first five years. The study focuses on patients undergoing embryo transfers, comparing outcomes between those receiving non-euploid aneuploid or mosaic embryos and those receiving euploid embryos.
Participants are grouped based on the type of embryo transferred. One group includes patients who choose to transfer non-euploid embryos when no acceptable euploid embryos are available, and the other group includes those undergoing euploid embryo transfer following standard care protocols. All other medical interventions follow usual care practices. The study gathers genetic testing results and records pregnancy outcomes over several years.
Participants provide medical records related to their pregnancy, and any genetic or fetal testing data are carefully reviewed. For those with live births, pediatric records and developmental milestone surveys are collected for up to five years to assess child health and development. The primary outcome is pregnancy rate within three years, with additional outcomes including live birth rate, obstetric complications, and pediatric development tracked over extended timeframes. There is no financial compensation for participation.
CONDITIONS
Brief Title
Pregnancy and Developmental Outcomes After Transfer of Reportedly Aneuploid or Mosaic Embryos
Research Team
R
Ronit Mazzoni, MS
R
REI Research Coordinator
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This table compares participation in this trial with other options available for this condition. The information is drawn from published research and the trial’s study details and is provided for educational purposes only.
Factors
Transfer of Mosaic or Aneuploid Embryos
Transfer of Chromosomally Normal Embryos
What it is
Transfer of embryos identified as mosaic or aneuploid (excluding triploid), when no other suitable embryos are available.
Transfer of euploid (chromosomally normal) embryos according to standard protocols in assisted reproduction.
Role in trial
Investigational group receiving mosaic or aneuploid embryos for transfer.
Active comparator group receiving chromosomally normal embryos for transfer.
Primary use (clinical purpose)
To evaluate whether transfer of mosaic or aneuploid embryos can result in pregnancy and birth when no euploid embryos are available.
To achieve pregnancy and healthy birth using chromosomally normal embryos as standard practice in IVF.
How it is given or performed
Embryos identified as mosaic or aneuploid using preimplantation genetic testing are transferred following standard IVF protocols. Triploid embryos are excluded.
Euploid embryos diagnosed through preimplantation genetic screening are selected and transferred as per routine IVF procedure.
Evidence status
Growing published evidence shows mosaic or some aneuploid embryo transfers may lead to pregnancies and live births, but rates are typically lower compared to euploid embryos. Data remain limited, and ongoing clinical trials seek to clarify safety and developmental outcomes.
Extensive evidence supports euploid embryo transfer as the most effective approach for successful pregnancy and live birth in IVF, with higher pregnancy and live birth rates than transfer of mosaic or aneuploid embryos.
Important limitations
Transfer of mosaic or aneuploid embryos carries uncertain risks for pregnancy success, miscarriage, and potential developmental outcomes. Data are limited, and long-term effects require further study. Selection relies heavily on precise genetic testing, and some embryos (triploid) are excluded.
Even with euploid embryo transfer, not all pregnancies result in live birth. The process depends on accurate genetic diagnosis, and some chromosomally normal embryos may still fail to implant or develop. Access and eligibility are limited by embryo availability and testing technology.
Disclaimer: This comparison is created with the help of artificial intelligence(AI) and may contain errors or missing information. It is not medical advice and does not mean one option is better or safer than another. Clinical trials are still being studied, and joining a trial is your choice. Please consult your healthcare professional before making any decisions.
Who Can Participate
Age: 18Years - 55Years
FEMALE
Healthy Volunteers
Eligibility Criteria
You may qualify if you...
Available aneuploid or mosaic embryos
No other acceptable embryos available
Willing to travel to Stanford for treatment
English language fluency
Female participants aged 18 to 55 years
You will not qualify if you...
Use of international donor eggs or sperm not tested according to FDA guidelines
Living outside the United States
Embryos with triploidy are not eligible for transfer in this protocol
Your Study Journey
Screening
Duration - 2 to 4 weeks
Participants are screened for eligibility to participate in the trial.
1 visit (in-person)
Treatment
Duration - Up to embryo transfer and immediate post-transfer period
Participants undergo embryo transfer according to their group: either non-euploid (aneuploid or mosaic) embryo transfer or euploid embryo transfer as standard of care.
1 transfer visit (in-person)
Follow-up
Duration - Up to 7 years and 3 months
Participants provide medical records of their pregnancy and pediatric records for up to 5 years, including surveys for developmental milestones.
Periodic medical record collection and surveys over follow-up period
How is the study designed?
Study Type
INTERVENTIONAL
Masking
NONE
Allocation
NON_RANDOMIZED
Model
PARALLEL
Primary Purpose
TREATMENT
Number of Arms
2
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Published Research Related To This Trial
Detailed investigation into the cytogenetic constitution and pregnancy outcome of replacing mosaic blastocysts detected with the use of high-resolution next-generation sequencing.