Abstract
Objective
The primary objective of this study was to test the hypotheses that compared to IVF cycles undergoing preimplantation genetic testing for aneuploidy (PGT-A) with or without testing for monogenic disorders (PGT-M), IVF cycles undergoing PGT for structural rearrangements (PGT-SR) will have (1) a poorer blastocyst conversion rate and (2) fewer usable blastocysts available for transfer. Secondarily, the study aimed to compare pregnancy outcomes among PGT groups.
Patients
Retrospective cohort study including cycles started from January 1, 2012, to March 30, 2020, with the intent of pursuing PGT-A, PGT-A with PGT-M, and PGT-SR, with trophectoderm biopsy on days 5 or 6.
Results
A total of 658 women underwent 902 cycles, including 607 PGT-A, 216 PGT-A&M, and 79 PGT-SR cycles. When compared with the blastocyst conversion rate for the PGT-A group (59.4%), and after adjustment for patient age, total number of mature oocytes, BMI, and ICSI, there were no significant differences for either the PGT-A&M (69.7%, aRR 1.03, 95% CI 0.96–1.10) or PGT-SR (63.2%, aRR1.04, 95% CI 0.96–1.13) groups. Compared to the PGT-A group, the proportion of usable blastocysts was statistically significantly lower in the PGT-SR group: 35.1% versus 24.4% (aRR 0.57, 95% CI 0.46–0.71) and the PGT-A&M group: 35.1% versus 31.5% (aRR 0.68, 95% CI 0.58–0.81). Implantation, pregnancy, and miscarriage rates were equivalent for all groups.
Conclusion
Patients with structural rearrangements have similar blastocyst development but significantly fewer usable blastocysts available for transfer compared to PGT-A testers. Nevertheless, with the transfer of a usable embryo, PGT-SR testers perform as well as those testing for PGT-A.
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Insogna, I.G., Lanes, A., Dobson, L. et al. Blastocyst conversion rate and ploidy in patients with structural rearrangements. J Assist Reprod Genet 38, 1143–1151 (2021). https://doi.org/10.1007/s10815-021-02131-2
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DOI: https://doi.org/10.1007/s10815-021-02131-2