Disclosure of experience with oocyte cryopreservation

Egg donation in the age of vitrification: A study of egg providers' perceptions and experiences in the UK, Belgium and Spain

Lafuente-Funes S et al., 2023 · Sociology of health & illness

IVF treatment involving donated eggs increases yearly. Numerous technical and commercial transformations have reshaped how eggs are retrieved, stored and managed. A key transformation is vitrification; a 'fast freezing' method that allows efficient preservation of eggs, and therefore more flexibility in use, giving rise to new commercial possibilities. There has been limited focus on egg providers' experiences in the context of vitrification and related commercialisation. We report findings from a study in the UK, Spain and Belgium, where we interviewed 75 egg providers. Comparing experiences within different donation 'regimes' allows an exploration of how varying national practices and policies shape information-giving and women's experiences. In the UK, a system of 'informed gift-giving' was described, where egg providers saw their actions as not-for-profit and felt relatively well informed. In Belgium, the system was presented as 'trusted tissue exchange': with less information-giving than in the UK, but clinics were trusted to act responsibly. In Spain, a 'closed-door, market-driven' system was described, whereby egg providers received little information and expressed concerns about generation of excess profit. Our findings extend understandings of how egg donation is managed at the national level and how donation regimes produce specific experiences, expectations and subjectivities amongst tissue providers.

Planned oocyte cryopreservation: a systematic review and meta-regression analysis

Hirsch A et al., 2024 · Human Reproduction Update

Awareness of the age-related decline in fertility potential has increased the popularity of planned oocyte cryopreservation (POC). However, data regarding outcomes of POC, including rates of women returning to thaw oocytes, as well as pregnancy and live birth rates, are scarce and based mostly on small case series. POC was defined as cryopreservation exclusively for prevention of future age-related fertility loss. The primary outcome was live birth rate per patient. The secondary outcomes included the return to thaw rate and laboratory outcomes. A meta-regression analysis examining the association between live birth and age above 40 or below 35 was conducted. We conducted a systematic database search from inception to August 2022. The search included PubMed (MEDLINE) and EMBASE. Our search strategies employed a combination of index terms (Mesh) and free text words to compile relevant concepts. The systematic review and meta-regression were undertaken following registration of systematic review (PROSPERO registration number CRD42022361791) and were reported following guidelines of Preferred Reporting Items for Systematic Review and Meta-Analyses 2020 (PRISMA 2020). The database search yielded 3847 records. After the selection process, 10 studies, conducted from 1999 to 2020, were included. Overall, 8750 women underwent POC, with a mean cryopreservation age of 37.2 (±0.8). Of those, 1517 women returned to use their oocytes with a return rate of 11.1% (± 4.7%). The mean age at the time of cryopreservation for women who returned to use their oocytes was 38.1 (±0.4), with an average of 12.6 (±3.6) cryopreserved oocytes per woman. In a meta-analysis, the oocyte survival rate was 78.5% with a 95% CI of 0.74-0.83 (I2 = 93%). The live birth rate per patient was 28% with a 95% CI of 0.24-0.33 (I2 = 92%). Overall, 447 live births were reported. In a sub-group analysis, women who underwent cryopreservation at age ≥40 achieved a live birth rate per patient of 19% (95% CI 0.13-0.29, I2 = 6%), while women aged ≤35 years old or younger had a higher live birth rate per patient of 52% (95% CI 0.41-0.63, I2 = 7%).

Assisted Reproductive Technology in Australia and New Zealand 2004

Bryant J et al., 2006 · AIHW National Perinatal Epidemiology and Statistics Unit

Assisted Reproductive Technology in Australia and New Zealand 2021

Newman JE et al., 2023 · National Perinatal Epidemiology and Statistics Unit, UNSW Sydney