Laura Rienzi

Keywords elective and non-elective vitrification freeze-all freeze-only INTRODUCTION Frozen embryo transfer (FET) has increased dramatically since vitrification became established as the preferred method of cryopreservation and has increased the post-thaw survival rates of frozen embryos and the success rates of FET cycles (Rienzi et al., 2017).

1IVIRMA Global Research Alliance, Genera, Livet, Turin, Italy 2IVIRMA Global Research Alliance, Genera, Clinica Valle Giulia, Rome, Italy 3Department of Biology and Biotechnology "Lazzaro Spallanzani", University of Pavia, Pavia, Italy 4Obstetrics and Gynecology 2U, Department of Surgical Sciences, City of Health and Science, S.

Keywords Multicycle IVF failure drop-out DuoStim Cumulative Live Birth Rate cycle discontinuation Introduction Over recent decades, assisted reproductive technology (ART) has undergone substantial advancements, shifting toward greater efficacy and efficiency in vitro fertilization (IVF) treatments. In this evolving landscape, the cumulative live birth rate (cLBR) per initiated cycle has emerged as the gold standard for evaluating overall effectiveness of IVF (Zegers-Hochschild et al., 2017).