To investigate the chromosome abnormality rates and clinical pregnancy outcomes after preimplantation genetic testing for aneuploidy (PGT-A) using either the progestin-primed ovarian stimulation (PPOS) protocol or the gonadotropin-releasing hormone (GnRH) antagonist protocol.

The study included 431 PGT-A cycles in which controlled ovarian stimulation was performed using the PPOS protocol (n = 320 cycles) or GnRH antagonist protocol (n = 111 cycles) between January 2018 and December 2021. Frozen embryo transfer was subsequently performed in 307 cycles with transferable blastocysts. The number of retrieved oocytes, embryo development, next-generation sequencing results, and clinical pregnancy outcomes were compared between the two protocols. The primary outcome measure was the aneuploidy rate. Secondary outcome measures were clinical pregnancy per first frozen-thawed embryo transfer cycle and cumulative live birth rates per PGT-A cycle.

There were no statistically significant between-group differences in the number of retrieved oocytes, available blastocysts, and high-quality blastocyst rate. The aneuploidy rates were similar between the two groups. There was no significant difference in clinical pregnancy outcomes, including the clinical pregnancy, implantation, miscarriage, live birth, or cumulative live birth rates, after frozen-thawed embryo transfer cycles (P>0.05).

The study found no significant differences in the aneuploidy rate, clinical pregnancy rate and cumulative live birth rate after PGT-A cycles between those using the PPOS protocol and those using the GnRH antagonist protocol.