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Purpose <p>This study aimed to compare the pregnancy outcomes of letrozole (LE)-induced ovulation and hormone replacement treatment (HRT) in endometrial preparation for frozen embryo transfer (FET) in women with polycystic ovary syndrome (PCOS).</p> Methods <p>A randomized controlled trial involved 200 patients with PCOS from December 2017 to December 2022. Participants, who underwent&#xa0;FET with one or two&#xa0;good-quality blastocysts or cleavage-stage embryos, were randomly assigned to the LE group or HRT group in a 1:1 ratio. The primary outcome was the clinical pregnancy rate. Secondary outcomes included biochemical pregnancy, implantation, ectopic pregnancy, miscarriage, multiple pregnancy, and live birth rates.</p> Results <p>The clinical pregnancy rate was 66.0% in the LE group compared to 53.0% in the HRT group (absolute difference, 13.0% [95% CI, − 0.5 to 26.5%]; RR, 1.25 [95% CI, 0.98 to 1.57]; <i>P</i> = 0.061). The biochemical pregnancy rate was higher in the LE group (71.0% vs 57.0%; absolute difference, 14.0% [95% CI, 0.8 to 27.2%]; RR, 1.25 [95% CI, 1.01 to 1.54]; <i>P</i> = 0.039). No significant differences were observed for the other secondary outcomes. The LE group showed&#xa0;higher biochemical pregnancy and live birth rates in the normal weight and normal androgen subgroups. Pregnancy outcomes were similar in the overweight and hyperandrogenic subgroups.</p> Conclusion <p>There were no statistically significant differences in clinical pregnancy rates between the LE and HRT cycles for FET in women with PCOS. However, the LE protocol may be a preferable&#xa0;option to HRT for women&#xa0;with normal weight or normal androgen levels.</p> Clinical trial registration <p>This study was registered at Chinese Clinical Trial Registry (<a href="http://www.chictr.org.cn/">http://www.chictr.org.cn/</a>; ChiCTR-IOR-17014124).</p>

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Letrozole-stimulated cycles versus hormone replacement treatment cycles for frozen embryo transfer in women with polycystic ovary syndrome: a prospective randomized controlled trial

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Linlin Jiang,
  • Jia Huang,
  • Yanxin Xie,
  • Lin Li,
  • Ping Pan,
  • Ruiyi Zhu,
  • Dongzi Yang,
  • Yu Li

摘要

Purpose

This study aimed to compare the pregnancy outcomes of letrozole (LE)-induced ovulation and hormone replacement treatment (HRT) in endometrial preparation for frozen embryo transfer (FET) in women with polycystic ovary syndrome (PCOS).

Methods

A randomized controlled trial involved 200 patients with PCOS from December 2017 to December 2022. Participants, who underwent FET with one or two good-quality blastocysts or cleavage-stage embryos, were randomly assigned to the LE group or HRT group in a 1:1 ratio. The primary outcome was the clinical pregnancy rate. Secondary outcomes included biochemical pregnancy, implantation, ectopic pregnancy, miscarriage, multiple pregnancy, and live birth rates.

Results

The clinical pregnancy rate was 66.0% in the LE group compared to 53.0% in the HRT group (absolute difference, 13.0% [95% CI, − 0.5 to 26.5%]; RR, 1.25 [95% CI, 0.98 to 1.57]; P = 0.061). The biochemical pregnancy rate was higher in the LE group (71.0% vs 57.0%; absolute difference, 14.0% [95% CI, 0.8 to 27.2%]; RR, 1.25 [95% CI, 1.01 to 1.54]; P = 0.039). No significant differences were observed for the other secondary outcomes. The LE group showed higher biochemical pregnancy and live birth rates in the normal weight and normal androgen subgroups. Pregnancy outcomes were similar in the overweight and hyperandrogenic subgroups.

Conclusion

There were no statistically significant differences in clinical pregnancy rates between the LE and HRT cycles for FET in women with PCOS. However, the LE protocol may be a preferable option to HRT for women with normal weight or normal androgen levels.

Clinical trial registration

This study was registered at Chinese Clinical Trial Registry (http://www.chictr.org.cn/; ChiCTR-IOR-17014124).