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Donor IVF less successful with frozen eggs

17 August 2015

By Meghna Kataria

Appeared in BioNews 815

Using frozen donated eggs over fresh ones for IVF hampers the odds of a successful live birth, a study has found.

Writing in JAMA, a team of authors from the Center for Human Reproduction in New York tracked the outcomes of IVF cycles performed with either fresh or frozen (cryopreserved) eggs. They found that use of frozen eggs resulted in women having fewer live births compared to the former group, by a small but statistically significant degree.

'We were not surprised by the observed lower pregnancy rates with frozen eggs compared to fresh. However, we were pleasantly surprised that the pregnancy rates were still quite high for both frozen and fresh eggs,' Dr Vitaly A. Kushnir of the Center for Human Reproduction, first author of the study, told Healthline. 'Use of fresh eggs remains the gold standard since the pregnancy rates are superior and we have many years of experience and know much more about the safety of IVF with fresh eggs.'

Traditionally, donor IVF uses fresh eggs, which are fertilised immediately after retrieval and transferred to the recipient's uterus. However, owing to concerns over convenience and cost,the use of frozen eggs has swelled in recent years, especially as the American Society for Reproductive Medicine dropped the 'experimental' label on the technique of cryopreservation (see BioNews 681).

To directly compare the success of fresh and frozen eggs, the researchers examined data on US-based fertility clinics for the year 2013, containing information on 92 percent of IVF cycles performed in the country. Out of a total of 11,148 egg-donation cycles, 20 percent employed frozen eggs.

Their analysis revealed that for every round of embryo transfer, 56.1 percent of women using fresh eggs went on to have a live birth, compared with 47.1 per cent using frozen or thawed ones. A similar trend was found when they compared the success rates per round of IVF completed.

The researchers ventured that, despite recent advances, the freezing and thawing process that a cryopreserved egg undergoes might still negatively impact its quality, resulting in the discrepancy in success rates.

However, they acknowledged the limitations of the study and the need for caution. First, the study was based on anonymised aggregate outcomes, without taking into account confounding factors such as the ages of fresh and frozen egg donors. Second, IVF cycles typically involve far more fresh eggs than frozen eggs, perhaps skewing the success rates towards the former.

Dr James Toner, president of the US Society for Assisted Reproductive Technologies wrote to The Washington Post: 'In traditional donor egg therapy (using fresh eggs), the recipient gets all the eggs the donor makes (typically 15-25). When frozen eggs are employed, only a batch of 6-8 eggs are provided. This has a big effect on outcomes!'

'The good news is that there are more reproductive options now than ever, but we must proceed with caution,' commented Dr Kushnir. 'IVF is evolving quickly with many new techniques and technologies being introduced. It is important that before wide utilisation the safety and efficacy of each be vetted in well-designed studies. '

RELATED ARTICLES FROM THE BIONEWS ARCHIVE

09 January 2017 - by Ayala Ochert 
Implanting two embryos can reduce IVF success by a quarter if one of the embryos is of poorer quality, new research suggests...
24 October 2016 - by Sarah Pritchard 
Female teachers are more likely to conceive during IVF treatment than their peers of a similar age in similarly paid professions, research shows...
15 August 2016 - by Dr Barbara Kramarz 
Women with polycystic ovary syndrome who undergo IVF using frozen embryos are more likely to have successful pregnancies than those using fresh embryos, a study suggests...
13 June 2016 - by Ayala Ochert 
British athlete Greg Rutherford has frozen a sample of his sperm ahead of the Rio Olympics this summer because of concern over the Zika virus...
02 November 2015 - by Lone Hørlyck 
Egg donors are suing the American Society for Reproductive Medicine and the Society for Assisted Reproductive Technology in a class-action lawsuit for setting a 'price cap' on compensation to egg donors...

10 August 2015 - by Dr Mary Yarwood 
The ban on single women freezing their eggs in China has been heavily criticised on social media after a Chinese actress revealed that she had travelled to the USA in 2013 to have her eggs cryopreserved...
29 June 2015 - by Ari Haque 
A UK bioethicist has argued that 18-year-old men should consider freezing their sperm to reduce the risk of their children having genetic disorders...
15 June 2015 - by Dr Julia Hill 
A woman who has received a transplant of ovarian tissue stored when she was a child has given birth. It is believed to be the first time ovarian tissue taken from young girl has led to a successful pregnancy...
09 March 2015 - by Dr Rachel Brown 
I arrived with some bemusement at this one-hour debate, 'Does egg-freezing enable women to "have it all"', to Beyoncé playing out loudly to an excited lecture theatre...
27 October 2014 - by Heidi Mertes 
Facebook and Apple's recently announced plans make egg-freezing sound like an insurance plan for women wanting to build their careers, but should be viewed as a last resort....

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