Fertility preservation for transgender, non-binary, and gender-expansive individuals in France: A comprehensive assessment of healthcare services and practices.

Introduction: Fertility preservation (FP) consultations are recommended before treatments that may affect fertility, including gender-affirming hormone therapy (GAHT). While some FP centers in France assist individuals undergoing gender transition, many transgender, non-binary, and gender-expansive individuals still choose not to pursue gamete cryopreservation. This study provides an overview of access to FP for transgender individuals in France in 2021.

Comparison of serum inhibin A and estradiol levels for monitoring ovarian stimulation in IVF: a preliminary study.

Introduction: Controlled Ovarian Hyperstimulation (COH) is crucial in Assisted Reproductive Techniques (ART), as it determines the number of mature oocytes retrieved, a key factor in pregnancy success. Serum estradiol (E2) is commonly used alongside transvaginal ultrasound (TVUS) to monitor ovarian response, but its accuracy is limited due to secretion from multiple follicular categories. In contrast, serum Inhibin A, primarily secreted by mature antral follicles, may offer a more accurate reflection of follicular maturity.

Ultra-Fast Warming Procedure of Vitrified Blastocysts Results in Maintained Embryology and Clinical Outcomes.

Vitrification has revolutionized embryo cryopreservation, but represents a significant workload in the IVF lab. We evaluated here an ultrafast blastocyst warming procedure in order to improve workflow while maintaining clinical outcome. We first evaluated the expression of main markers of lineage specification in a subset of blastocysts donated to research warmed with ultrafast protocol.

Ovarian response in preimplantation genetic testing for myotonic dystrophy type 1.

Purpose: To evaluate ovarian stimulation response in couples undergoing preimplantation genetic testing (PGT-M) for myotonic dystrophy type 1 (DM1) METHODS: Retrospective, observational, multicentric study. Parameters of ovarian response and PGT-M outcomes were compared according to the DM1-affected patient (female or male). A total of 229 couples underwent at least one controlled ovarian hyperstimulation cycle for the PGT-M procedure.

Spinal muscular atrophy is also a disorder of spermatogenesis.

Background: Spinal muscular atrophy (SMA) patients benefit from pre-mRNA splicing modifiers targeting the SMN2 gene, which aims to increase functional SMN production. The animal toxicity affecting spermatogenesis associated with one such treatment raised questions about male SMA patients' spermatogenesis.

Methods: This descriptive, cross-sectional study was conducted from June 2022 to July 2023.

Predicting the number of oocytes retrieved from controlled ovarian hyperstimulation with machine learning.

Study Question: Can machine learning predict the number of oocytes retrieved from controlled ovarian hyperstimulation (COH)?

Summary Answer: Three machine-learning models were successfully trained to predict the number of oocytes retrieved from COH.

What Is Known Already: A number of previous studies have identified and built predictive models on factors that influence the number of oocytes retrieved during COH. Many of these studies are, however, limited in the fact that they only consider a small number of variables in isolation.

Developmental-stage specific single-cell human embryo dissociation.

Isolation of individual cells ensures detailed analysis of human embryos and promotes our understanding of molecular mechanisms driving embryo development and cell specification. Here, we present a protocol for the processing of human embryos for single-cell analysis. We describe steps for growing embryos and individualizing cells from the polar and the mural parts of trophectoderm at the blastocyst stage using laser dissection.

[New models to study human embryonic development].

Since 2021, assisted reproductive technologies (ART) are available to infertile couples, but also to single women and female couples. The process of in vitro fertilization (IVF) has allowed to cross the threshold of 5 million births worldwide, between 1978 and 2013. However, the failure rate per each IVF cycle is estimated to be around 75%.

Impact of the duration of oestradiol treatment on live birth rate in Hormonal Replacement Therapy cycle before frozen blastocyst transfer.

Although the duration of progesterone administration in Hormonal Replacement Therapy (HRT) cycles before frozen embryo transfer is standardized, the optimal duration of oestrogen treatment remains controversial. In this monocentric retrospective study conducted in all single frozen blastocyst transfer (FBT) performed with HRT between January 2016 and July 2019, we evaluated the association between the duration of oestradiol treatment before FBT and live birth rate (LBR) in HRT cycles. Cycles were gathered in 3 groups according to quartiles of duration of oestrogen treatment.

A pilot study comparing corifollitropin alfa associated with hp-HMG versus high dose rFSH antagonist protocols for ovarian stimulation in poor responders.

Does corifollitropin alfa associated with hp-HMG protocol from the beginning of ovarian stimulation perform better than high dose rFSH alone for ovarian stimulation with GnRH antagonist in poor responders? This retrospective, monocentric, case-control pilot study was conducted in 65 poor responders (Bologna criteria) undergoing 2 consecutive IVF cycles. All patients underwent a first ovarian stimulation cycle with high dose rFSH (≥300 IU/day) alone in antagonist protocol, unfortunately leading to poor ovarian response and no pregnancy. The following cycle was performed with 150 μg of corifollitropin alfa associated with daily injections of hp-HMG from the beginning of the cycle.

Ovarian reserve and response to stimulation in women undergoing fertility preservation according to malignancy type.

Research Question: Does ovarian reserve and ovarian response to ovarian stimulation in women with cancer undergoing oocyte vitrification for fertility preservation vary according to the type of malignancy?

Design: Retrospective cohort study including 105 women aged between 18 and 40 years, who were referred for fertility preservation (oocyte vitrification) between 2013 and 2016. The women were divided into three groups: breast cancer, lymphoma or other cancer. All of them had been recently diagnosed with cancer, with gonadotoxic treatment scheduled, and had oocyte vitrification after ovarian stimulation with antagonist protocol.

Association between early βhCG kinetics, blastocyst morphology and pregnancy outcome in a single-blastocyst transfer program.

Objective(s): Beta human chorionic gonadotrophin (β-hCG) is secreted by placenta and detectable in maternal serum a few days after embryo implantation. The evolution of β-hCG serum levels is commonly used to confirm early pregnancy and differentiate normal pregnancies from others, either in spontaneous pregnancies or after IVF. However, little is known on the eventual link between blastocyst quality in IVF, pregnancy outcome, and βhCG kinetics.