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Comparative Study
. 2025 Jul 8:16:1492293.
doi: 10.3389/fendo.2025.1492293. eCollection 2025.

A comparative analysis of progestin-primed ovarian stimulation versus GnRH antagonists protocols pertaining to stimulation parameters and embryological outcomes in patients with endometrioma

Fazilet Kubra Boynukalin  1   2 , Yusuf Aytaç Tohma  3   4 , Meral Gultomruk  5 , Zalihe Yarkiner  6 , Ceren Melisa Akkaya  7 , Sinan Ozkavukcu  8 , Mustafa Bahceci  1 , Gürkan Bozdağ  1
Affiliations
Comparative Study

A comparative analysis of progestin-primed ovarian stimulation versus GnRH antagonists protocols pertaining to stimulation parameters and embryological outcomes in patients with endometrioma

Fazilet Kubra Boynukalin et al. Front Endocrinol (Lausanne). .

Abstract

Research question: Do embryo parameters and live birth rates differ between patients with endometrioma undergoing a freeze-all strategy using either GnRH antagonists or progestin-primed ovarian stimulation (PPOS)?

Design: This retrospective cohort study was conducted at Bahceci Health Group from January 2021 to January 2023. Inclusion criteria were females aged 20-40 with confirmed endometriosis, using either GnRH antagonists or PPOS ovarian stimulation, and opting for freezing all embryos without fresh embryo transfer (ET). A total of 543 patients were analyzed, with the primary outcome being usable embryos at cleavage stage and secondary outcomes including distribution of embryo quality, clinical pregnancy, and live birth rate.

Results: For the GnRH antagonist arm, the median (25th-75th percentiles) total gonadotropin dose required during stimulation was significantly higher (2725 [2100-3587.5] vs. 2400 [2050-3075] IU, p = 0.001) and duration was longer (11 [10-12] vs. 10 [9-11] days, p = 0.01), although number of mature oocytes and maturation and fertilization rates were similar in both arms. However, the linear regression analysis revealed that the number of usable day-three embryos was higher with the PPOS protocol than with the GnRH antagonist protocol (OR: 0.890, CI 95%: 0.226 - 1.554, p= 0.009). Particularly in patients that had undergone FET, the respective live birth rates were 50.0% and 54.6% in GnRH antagonist and PPOS arms, respectively, without any statistical significance (p= 0.365).

Conclusion: In patients with endometrioma, the PPOS protocol over GnRH antagonists might potentially enhance the quantity of usable cleavage-stage embryos while showing no significant impact on the number of collected oocytes.

Keywords: GnRH antagonist; ICSI; PPOS; endometrioma; endometroiosis.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
Flow-chart of the study population.
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