ArticleGeburtshilfe und Frauenheilkunde2020
Pregnancy Outcomes Following Letrozole Use in Frozen-thawed Embryo Transfer Cycles: A Systematic Review and Meta-analysis.
Article in Geburtshilfe und Frauenheilkunde, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
8 citing papers in PubMed, 19 citations in OpenAlex.
- Ovulatory cycle frozen embryo transfer yields similar pregnancy outcomes to programmed transfer while avoiding painful injections.Journal of assisted reproduction and genetics · 2025Article
- A Non-Inferiority Study on Endometrial Preparation Prior to FET-Letrozole Versus Hormone Replacement Therapy.Journal of obstetrics and gynaecology of India · 2024Article
- Effect of different endometrial preparation methods on pregnancy outcome of FET in women with a normal menstrual cycle.Journal of family medicine and primary care · 2024Article
- Assisted Reproductive Technology and Disease Management in Infertile Women with Multiple Sclerosis.CNS drugs · 2023Review
- The effect of mildly stimulated cycle versus artificial cycle on pregnancy outcomes in overweight/obese women with PCOS prior to frozen embryo transfer: a retrospective cohort study.BMC pregnancy and childbirth · 2022Article
- The impact of estradiol on pregnancy outcomes in letrozole-stimulated frozen embryo transfer cycles.F&S reports · 2021Article
- Comparison of Stimulated Cycles with Low Dose r-FSH versus Hormone Replacement Cycles for Endometrial Preparation Prior to Frozen-Thawed Embryo Transfer in Young Women with Polycystic Ovarian Syndrome: A Single-Center Retrospective Cohort Study from China.Drug design, development and therapy · 2021Article
- Letrozole for Female Infertility.Frontiers in endocrinology · 2021Review
Corrections and comments
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Authors and funding
6 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
While widely used for ovulation induction in assisted reproductive technology, the clinical efficacy of letrozole for endometrial preparation prior to frozen-thawed embryo transfer (FET) cycles remains yet to be elucidated. We performed a meta-analysis to compare pregnancy outcomes after letrozole use with those of other endometrial preparation protocols in patients undergoing FET. PubMed, Scopus, Embase and the Cochrane Library were searched for eligible studies. Clinical pregnancy rate (CPR), live birth rate (LBR) and birth defect rate (BDR) were analysed using odds ratio (OR) and 95% confidence interval (CI). A total of 10 studies representing 75 968 FET cycles were included. Comparable CPR and LBR were observed when comparing letrozole administration with natural cycle (OR 1.24, 95% CI: 0.69 - 2.24; OR 1.18, 95% CI: 0.60 - 2.32), artificial cycle (OR 1.46, 95% CI: 0.87 - 2.44; OR 1.39, 95% CI: 0.77 - 2.52), and artificial cycle with gonadotropin-releasing hormone agonist suppression (OR 1.11, 95% CI: 0.78 - 1.59; OR 1.18, 95% CI: 0.82 - 1.68). Pooled results of the limited studies comparing letrozole with human menopausal gonadotropin demonstrated a similar CPR between groups (OR 1.46, 95% CI: 0.29 - 7.21, two studies), but the letrozole group had a statistically lower LBR (OR 0.67, 95% CI: 0.52 - 0.86, one study). No increased BDR was observed in the letrozole group compared to natural cycles or artificial cycles (OR 0.98, 95% CI: 0.60 - 1.61; OR 1.39, 95% CI; 0.84 - 2.28). This pooled analysis supports the use of letrozole as an efficacious and safe alternative to mainstream regimens for endometrial preparation in FET cycles.
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