[Effect of Preimplantation Genetic Testing for Aneuploidies on Live Birth Outcomes and the Influencing Factors in Women of Advanced Maternal Age].

Objective: To investigate effect of preimplantation genetic testing for aneuploidies (PGT-A) on the reproductive outcomes of women of advanced maternal age (AMA) (≥38 years), and to analyze factors influencing the live birth rate in AMA women who have received PGT-A.

Methods: A retrospective cohort study was conducted. AMA women undergoing PGT-A were enrolled in the PGT-A group. All of them underwent their first oocyte retrieval cycle between January 2019 and June 2023. AMA women undergoing fertilization/intracytoplasmic sperm injection (IVF/ICSI) and their first oocyte retrieval cycle over the same period of time were enrolled in the control group (the non-PGT-A group) via propensity score matching. The PGT-A group and the non-PGT-A group each included 193 cycles, which were followed up until January 2024. Follow-up concerning live births was completed for all oocyte retrieval cycles conducted between January 2019 and October 2022. The reproductive outcomes were compared between the two groups. The primary outcome indicator was cumulative live birth rate (CLBR) per oocyte retrieval, while the secondary outcome indicators were cumulative clinical pregnancy rate (CCPR) per oocyte retrieval and spontaneous abortion rate. For the 145 cycles in the PGT-A group with completed live birth follow-up, binary logistic regression analysis and receiver operator characteristic (ROC) curves were used to analyze the influencing factors of live birth rates.

Results: A total of 145 cycles in the PGT-A group and 161 cycles in the non-PGT-A group completed follow-up for live births. The CLBR per oocyte retrieval of the PGT-A group was 25.52% (37/145), while that of the non-PGT-A group was 28.50% (46/161), with no significant difference being observed between the two groups (<0.05). Of the 193 oocyte retrieval cycles in each group, 53 cycles in the PGT-A group and 72 cycles in the non-PGT-A group resulted in clinical pregnancies, with the difference in the CCPR per oocyte retrieval being statistically significant (27.46% vs. 37.31%, <0.05). Concerning clinical pregnancies, the spontaneous abortion rate of the PGT-A group was lower than that of the non-PGT-A group, with the difference being statistically significant (7.55% vs. 25.00%, <0.05). In AMA women who had undergone PGT-A for reproductive assistance, maternal age (odds ratio [OR]=0.786, 95% confidence interval [CI]: 0.635-0.973) and the antral follicle count (AFC) (OR=1.110, 95% CI: 1.013-1.216) were correlated with the outcome of live births outcome. The probability of live births decreased with increasing maternal age and decreasing AFC. When the female age was ≥42 years or when AFC≤8, the expected live birth outcome of PGT-A assisted pregnancy was poor.

Conclusion: PGT-A does not affect the CLBR per oocyte retrieval in AMA women, but it can effectively reduce the risks of implantation failure and spontaneous abortion due to fetal aneuploidies. For PGT-A-assisted pregnancy in AMA women, maternal age and AFC are important factors affecting the live birth outcomes.