Freeze-all or conventional IVF? Unanswered question from unlearned lessons
نویسندگان
چکیده
Sir, We read with great interest the study entitled ‘Transfer of fresh or frozen embryos: a randomized controlled trial’ (Wong et al., 2021), recently accepted for publication in Human Reproduction. In this well-designed (n = 204), Wong al. tried to address question whether elective ‘embryo freeze-all strategy’ (i.e. transfer frozen-thawed blastocysts [FETs]) was superior ‘conventional and FETs) unselected women undergoing IVF. Intriguingly, authors found conventional strategy be markedly terms ongoing pregnancy rate (cumulative OPR 32% vs 19% [relative risk (RR) 0.59, 95% CI 0.36–0.98]). The superiority evident between groups at time first embryo-transfer (OPR 25% 8% [RR 0.32, 0.15–0.68]), but not following FETs (RR 2.00, CI...
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ژورنال
عنوان ژورنال: Human Reproduction
سال: 2021
ISSN: ['1460-2350', '0268-1161']
DOI: https://doi.org/10.1093/humrep/deab115