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IVF success rates higher if egg collection is done in the summer, say researchers

New study suggests the best conditions for live births appear to be associated with summer

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The time of year when eggs are collected from women’s ovaries during fertility treatment could make a difference to live birth rates, new research has found.

Australian researchers have found that transferring frozen then thawed embryos to women’s wombs from eggs collected in the summer resulted in a 30 per cent higher likelihood of babies born alive than if the eggs had been retrieved in the autumn.

The team found a 28 per cent increase in the chances of a live birth among women who had eggs collected during days that had the most sunshine compared to days with the least sunshine.

“Over the duration of our study, the average live birth rate following frozen embryo transfer in Australia was 27 births per 100 people. In our study, the overall live birth rate following frozen embryo transfer was 28 births per 100 people,” said Dr Sebastian Leathersich, an obstetrician, gynaecologist and fellow in reproductive endocrinology and infertility at Fertility Specialists of Western Australia, City Fertility Centre, and the King Edward Memorial Hospital in Perth, Australia, who led the study.

“If eggs were collected in autumn, it was 26 births per 100 people, but if they were collected in summer there were 31 births per 100 people. This improvement in birth rates was seen regardless of when the embryos were finally transferred to the women’s wombs.

“The live birth rates when eggs were collected in spring or winter lay between these two figures, and the differences were not statistically significant.”

Until now, there have been conflicting findings on the effects of the seasons on pregnancies and live birth rates following egg collection and embryo freezing.

“It’s long been known that there is seasonal variation in natural birth rates around the world, but many factors could contribute to this including environmental, behavioural and sociological factors,” Leathersich explained.

“Most studies looking at IVF success rates have looked at fresh embryo transfers, where the embryo is put back within a week of the egg being collected. This makes it impossible to separate the potential impacts of environmental factors, such as season and hours of sunshine, on egg development and on embryo implantation and early pregnancy development.

“These days, many embryos are ‘frozen’ and then transferred at a later date. We realised this gave us an opportunity to explore the impact of environment on egg development and on early pregnancy separately by analysing the conditions at the time of egg collection independently from the conditions at the time of embryo transfer.”

Leathersich and his colleagues analysed outcomes from all frozen embryo transfers carried out at a single clinic in Perth over a period of eight years, from January 2013 to December 2021.

During this time there were 3,659 frozen embryo transfers with embryos generated from 2,155 IVF cycles in 1,835 patients. Information on outcomes was missing for two frozen embryo transfers and so these were excluded, leaving 3,657 for analysis.

The researchers looked at birth outcomes according to season, temperatures, and the actual number of hours of bright sunshine, as opposed to calculating hours from sunrise to sunset. They obtained the data on weather from the Australian Bureau of Meteorology. They created three groups for duration of sunshine on days when eggs were collected: low sunshine days, medium sunshine days and high sunshine days.

“When we looked specifically at the duration of sunshine around the time the eggs were collected, we saw a similar increase to that seen for egg collection during the summer,” Leathersich explained.

“The live birth rate following a frozen embryo transfer from an egg that was collected on a day with fewer hours of sunshine was 25.8 per cent.

“This increased to 30.4 per cent when the embryo came from an egg that was collected on days with the most hours of sunshine. When we took into account the season and conditions on the day of the embryo transfer, this improvement was still seen.”

The temperature on the day of egg collection did not affect the chances of a live birth. However, the chances of a live birth rate decreased by 18 per cent when the embryos were transferred on the hottest days compared to the coolest days and there was a small increase in miscarriage rates.

The study suggests that the best conditions for live births appear to be associated with summer and increased sunshine hours on the day of egg retrieval, Leathersich said.

“There are many factors that influence fertility treatment success, age being among the most important. However, this study adds further weight to the importance of environmental factors and their influence on egg quality and embryonic development,” he added.

“We effectively separated the conditions at the time of egg collection from the conditions at the time of transfer, demonstrating that environmental factors when the eggs are developing are as, if not more, important than environmental factors during implantation and early pregnancy.

“Optimising factors such as avoiding smoking, alcohol and other toxins and maintaining healthy activity levels and weight should be paramount. However, clinicians and patients could also consider external factors such as environmental conditions.”

Factors that may play a role in the increased live birth rates after egg collection in the summer and during more sunshine hours include melatonin. Levels of this hormone are usually higher in winter and spring, and eggs take three to six months to develop before they are released from the ovaries.

Differences in lifestyles between winter and summer months may also play a role, scientists say. The finding that miscarriage rates were highest when embryo transfer took place on the hottest days are consistent with epidemiological studies that show higher rates of miscarriage in the summer months.

“This suggests that the negative effects of high temperature are more likely related to early pregnancy rather than egg development,” said Dr Leathersich.

Limitations of the study include the fact that it is a retrospective rather than prospective study: looking back at what had already happened. For this reason, it can’t show that conditions at the time of egg collection cause the difference in live birth rates, only that they are associated with them.

“Ideally, these findings should be replicated in other sites with different conditions and different treatment protocols to confirm the findings,” Leathersich concluded.

“It would also be interesting to look at the impact of season and environmental factors on sperm parameters, as this could have contributed to our observations. We are now planning to analyse this same group of patients using air quality data, as there may be seasonal changes in exposure to harmful pollutants which could negatively affect reproductive outcomes.

“Finally, given the huge increase in so-called ‘social egg freezing’ for fertility preservation and the fact that this group generally have flexibility about when they choose to undergo treatment, it would be very interesting to see if these observations hold true with frozen eggs that are thawed and fertilised years later.

“Any improved outcomes in this group could have big impacts for women making decisions about their future fertility, but the long-term follow-up required means it is likely to be some time before we can draw any conclusions for this population.”

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Vipoglanstat trial reaches recruitment halfway point

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Vipoglanstat has reached the halfway point for patient recruitment in a phase 2 endometriosis trial.

Gesynta Pharma said 50 per cent of the target of 190 patients have been randomised in the NOVA trial.

The study is evaluating vipoglanstat, described by the company as a novel, non-hormonal, non-opioid drug candidate for the treatment of endometriosis.

Endometriosis is a chronic inflammatory condition where tissue similar to the lining of the womb grows outside the uterus, often causing severe pain and, in some cases, infertility.

The condition affects more than 10 per cent of women of reproductive age.

Top-line results from the study are expected in 2027.

The NOVA trial is a randomised, double-blind, placebo-controlled phase 2 proof-of-concept study evaluating vipoglanstat in women with endometriosis across Europe.

This means patients are assigned to treatment groups by chance, neither participants nor researchers know who receives the drug or placebo during the study, and the results are intended to show whether the treatment has enough evidence to move into later testing.

The trial is assessing the efficacy and safety of two dose levels of vipoglanstat and will provide information for the design of a subsequent phase 3 programme.

Eva Johnsson, chief medical officer and vice president of clinical development at Gesynta Pharma, said:

“Reaching the halfway point in patient recruitment marks a major milestone for our Phase 2 clinical trial in endometriosis. Achieved well ahead of schedule, the rapid progress reflects strong participation from clinical sites and great interest among eligible participants. This momentum highlights the urgent need for better treatments.

“We are now eager to complete enrolment and proceed to the next phase of evaluation.”

Patric Stenberg, chief executive of Gesynta Pharma, said:

“The NOVA trial is a significant advancement in a field with few ongoing clinical trials, and a key step toward establishing a strong foundation for a future Phase 3 programme for vipoglanstat.

“Given the immense medical need, our focus remains on delivering a treatment that is highly effective, safe, and well-tolerated.”

Vipoglanstat is an orally active drug candidate designed to reduce pain and inflammation by targeting mPGES-1, an enzyme that produces prostaglandin E2, a substance linked to inflammation in endometriotic lesions.

A preclinical proof-of-concept study in an advanced endometriosis model found that vipoglanstat significantly reduced pain-related behaviours and endometriotic lesion burden.

Gesynta said previous clinical studies have supported the drug candidate’s safety, tolerability and pharmacodynamic effects in humans. Pharmacodynamic effects refer to how a drug acts in the body.

NOVA stands for the Non-hormonal Option, a Vipoglanstat Assessment trial.

Endometriosis commonly presents with severe period pain, known as dysmenorrhoea, pain between periods, pain during sexual intercourse, gastrointestinal symptoms and infertility.

Current management is typically limited to painkillers, hormonal therapies and surgery.

Despite its prevalence, Gesynta said endometriosis remains a critically underserved area of women’s health.

The company said the disease is significantly underdiagnosed and undertreated, with few new treatment options available to patients.

Approximately 190 patients aged 18 to 45 will receive vipoglanstat or placebo over four menstrual cycles.

The primary objective is to evaluate the effect of vipoglanstat on endometriosis-related pain during non-menstrual days.

Secondary objectives include assessing the effect on menstrual pain, known as dysmenorrhoea, pain during sexual intercourse, known as dyspareunia, use of opioid rescue medication and quality-of-life measures.

Changes in endometriotic lesions, areas of tissue linked to the condition, will also be explored using MRI scans.

Gesynta Pharma said its research on targeting mPGES-1 began at Karolinska Institutet in Sweden.

The company said a second drug candidate, GS-073, is ready to enter clinical phase 1 for the treatment of chronic inflammatory pain.

Gesynta Pharma’s shareholders include Hadean Ventures, Industrifonden, Innovestor Life Science, Linc, HealthCap, XGen Venture and other specialist investors.

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Femtech World Awards 2026: Celebrating initiatives that move women’s health forward

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By Wolfgang Hackl, CEO, OncoGenomX Inc., Allschwil, Switzerland

As the FemTech World Awards 2026 winners are revealed, it is a privilege to reflect on the Research Award 2026 sponsored by OncoGenomX Inc., and on the exceptional standard set by this year’s finalists.

On behalf of OncoGenomX Inc., sincere thanks to every applicant and congratulations go to the nominees whose work continues to push women’s health innovation forward.

Research Awards matter because they do more than recognize excellence in a single moment; they help elevate the science, courage, and systems thinking needed to transform women’s health at scale.

This year’s three finalists represented three different but equally important forms of progress. Natural Cycles brought forward one of the largest studies ever conducted on menstrual and ovulatory patterns in perimenopause, analysing nearly one million cycles from more than 197,000 women across over 140 countries.

That project stood out for both its dataset scale and its ability to translate new evidence into a regulated product designed to support women navigating a historically under-researched life stage.

IVI RMA stood out for scientific rigor and clinical precision. Its multicenter, double-blinded, non-selection study on non-mosaic segmental aneuploid embryos offered high-quality evidence on implantation and live birth outcomes, helping move fertility care away from assumption and toward a more evidence-based approach to embryo management and patient counseling.

UN ESCAP’s ‘Femtech in South-East Asia: Unlocking innovation for women’s health’ stood out for a different reason.

Rather than focusing on one product area or one clinical question, it mapped an entire emerging ecosystem.

The report examined the state of femtech across key South-East Asian markets, documented barriers such as financing gaps, stigma, weak ecosystem support, and data challenges, and then translated that research into practical recommendations for governments, investors, founders, and ecosystem builders.

In many ways, all three finalists are winners.

Each project excelled on core evaluation criteria including originality, relevance, coherence, effectiveness, efficiency, impact, and sustainability.

Each also offered something genuinely valuable to the future of women’s health: stronger evidence, clearer decision-making, more informed product development, and greater visibility for unmet needs that have gone too long without sufficient attention.

The final decision was therefore a genuine head-to-head race.

The jury supported its discussion with a numerical scoring approach, but it also looked carefully at systems impact: the extent to which a project not only advances one intervention, but improves the wider conditions under which innovation can emerge, scale, and endure.

That perspective mattered in this category, because the strongest research is not always only the most technically impressive; sometimes it is the research that opens doors for many future innovations to follow.

On that basis, the OncoGenomX Jury selected UN ESCAP as the winner of the Research Award.

The decisive factor was not simply that the report was comprehensive, though it was.

It was that the project helps change the environment around innovation itself.

It provides a practical roadmap for strengthening research, improving data governance, expanding founder support, addressing gender bias in investment, scaling innovative finance, and integrating women’s health more fully into policy and development agendas.

That broader enabling effect is what distinguished the UN ESCAP project. Natural Cycles demonstrated outstanding research translation, and IVI RMA demonstrated exceptional clinical rigor.

UN ESCAP, however, showed how research can influence the structures that determine whether many other femtech solutions will ever be funded, adopted, trusted, and scaled. In that sense, its impact reaches beyond one company, one product, or one clinical pathway, and toward a healthier innovation landscape overall.

Warm congratulations again to all finalists and nominees.

And special congratulations to UN ESCAP on receiving the OncoGenomX Research Award at the Femtech World Awards 2026.

The jury’s decision reflects deep respect for all three projects and a shared belief that women’s health advances fastest when excellent science is paired with the power to reshape the systems around it.

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WEC Chair calls out Health Minister’s delay on banning BBLs and other harmful cosmetic procedures

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WEC chair Sarah Owen has criticised delays over a ban on high harm cosmetic procedures, including liquid BBLs.

The Women and Equalities Committee has published a letter from health minister Karin Smyth after the government missed the 18 April deadline to respond to the committee’s report on cosmetic procedures.

The report, published on 18 February, recommended that high harm procedures such as liquid Brazilian butt lifts, known as BBLs, should be banned immediately without further consultation.

MPs said the government is “not moving quickly enough” in introducing a licensing system for non-surgical cosmetic procedures and “should accelerate regulatory action”.

They also warned that “this lack of timely action is fostering complacency in self-regulation” within the industry.

In her letter, Smyth said the Department of Health and Social Care had “taken the decision to first of all focus on introducing legal safeguards for the cosmetic procedures posing the highest risks and I can confirm that we plan to consult on draft regulations in June”.

The letter added:

“Our intention is to issue a formal government response to the WEC report, once our consultation setting out our proposed approach and underpinning legislation is published.

“I acknowledge the concerns around the government’s pace of delivery in this area but, as you will appreciate, this is a complex area of policy and striking the balance between increased patient safety, placing new requirements on businesses and introducing proportionate and enforceable regulation is challenging.

“I recognise that regulation has not kept pace with the expansion of the aesthetics industry and, on that basis, I can assure you that we are committed to implementing licensing in the current parliament.”

Owen, chair of the Women and Equalities Committee and Labour MP, said:

“Further consultation and delay on clamping down on high harm procedures such as liquid BBLs is unacceptable. It allows unscrupulous people to continue to put women at risk and lets down those who have lost loved ones following these practices or who have come to serious harm themselves.

“As WEC’s report warned back in February, procedures that are deemed high risk such as liquid BBLs and liquid breast augmentations, which have already been shown to pose a serious threat to patient safety, should be banned immediately.

“While it is positive to hear a licensing system for non-surgical cosmetic procedures will be introduced within this Parliament, this issue requires faster regulatory progress, particularly in high harm areas, and the Government is not moving quickly enough.

“The Committee previously heard a powerful and shocking testimony from a woman who developed sepsis after having a liquid BBL. Her experience and those of many others provides clear evidence of the need to tackle this evolving wild west.”

A liquid BBL is a non-surgical procedure intended to alter the shape of the buttocks.

Sepsis is a potentially life-threatening response to infection that can lead to organ damage if not treated quickly.

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