Fresh or frozen-embryo transfer results in similar pregnancy rates in women without PCOS

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Healthy infertile women with no polycystic ovarian syndrome have the same ongoing pregnancy and live birth rates from IVF irrespective of whether the embryo was fresh or frozen reports the results of two recent clinical trials published in JAMA. 

Recent clinical trials have documented higher pregnancy and live birth rates with the transfer of frozen embryos as compared to fresh ones. A clinical review published in the Journal of Human Reproduction Update also favored “elective frozen embryo transfer (eFET) not only in terms of achieving higher pregnancy rates but, more importantly, also in terms of lower maternal and infant morbidity and mortality.”

The two current studies were conducted to see whether fresh frozen embryo transfer resulted in higher birthrates in women who do not have PCOS.

The first multicenter, randomized trial recruited 2157 women who were scheduled to undergo their first IVF cycles. They were randomly assigned to undergo either fresh-embryo transfer or embryo cryopreservation followed by frozen-embryo transfer. The maximum embryo transferred in each participant was two with the live birth rate as the primary outcome after the first embryo transfer.

There was no significant difference in terms of live birth rates in the frozen-embryo group and the fresh-embryo group (48.7% and 50.2%; P=0.50) respectively. Both the groups were also similar in terms of risks of obstetrical and neonatal complications, rates of implantation, clinical pregnancy, overall pregnancy loss, and ongoing pregnancy.

But, frozen embryo transfer did result in a significantly lower risk of the ovarian hyperstimulation syndrome than fresh-embryo transfer (0.6% vs. 2.0%; P=0.005).

The second study randomly assigned 782 healthy infertile women with no PCOS to receive either a frozen embryo or a fresh embryo on day 3 during their first or second IVF. In this study also, the pregnancy rates were comparable in both the groups, 36.3% in the frozen-embryo group 34.5% in the fresh-embryo group (P = .65).

The authors concluded that in women who do not have PCOS, the pregnancy rates are similar with fresh or frozen embryos. In healthy infertile women, probably the uterine environment was favorable for fresh embryos transfer. 

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Stair-step ovulation induction protocols are not just limited to Clomiphene

Stair-step ovulation induction protocol with Letrozole is also as effective as stair-step method using Clomiphene Citrate, and has a slight edge over CC in obese patients reports the result of study published in March issue of Fertility and Sterility.

Stair-step ovulation induction protocols have shown to achieve ovulation induction in shorter time as compared to traditional protocols in women with PCOS. But, so far studies and clinical trials have mainly focused on Clomiphene Citrate(CC).

Letrozole has shown to have superior ovulation rates over CC in women with PCOS, but no study has so far evaluated the stair-step method for Letrozole in cases of absent follicular recruitment after the initial dose.

This Retrospective cohort study recruited 92 infertile PCOS patients, 49 patients completed a letrozole stair-step from Jan 2015-Oct 2016 while 43 patients received stair-step protocols from July 2013-2014.

Letrozole protocol used in the study

CC protocol used in the study 

The demographics of both the groups were nearly similar, except patients in the Letrozole group were obese with a mean BMI of 30.8 as compared to 26.3 in CC group.

Ovulation rates were comparable in both groups (95.9% vs 88.1%, p=0.09), as also time to attain pregnancy, clinical pregnancy rates and side effects.

Thus, letrozole can also be effectively used in stair-step doses for achieving ovulation and pregnancy in PCOS women resistant to traditional protocols.

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Stair-step clomiphene protocols shortens time to ovulation in women with PCOS

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 Stair-step clomiphene protocol shortens induction time and brings about more ovulation in women with PCOS says the results of a retrospective cohort study published in January issue of Journal Obstetrics and Gynecology.

The researchers looked at traditional and step-up protocol in terms of ovulation rates and time to ovulation in women who have not responded to initial dose of 50mg of clomiphene citrate(CC).

Over a period of 2 years, the study included 109 patients attending a university hospital infertility clinic, with 66 women receiving traditional treatment and 43 were given the stair-step dose of clomiphene.  

The women were monitored for time to ovulation, as well as ovulation rates, clinical pregnancy rates and mild to moderate side effects.

The traditional protocol was used in 2012, in which CC 50mg was given between days 5-9. If no ovulation occurred, the dose was increased by 50mg after a spontaneous menses or a progestin induced bleed.

The stair-step protocol was used in 2013, in which CC 50mg was given between days 5-9. If no developing follicle >10mm was noted between days 11-14, the dose was increased to100mg immediately for 5 days and an ultrasound was repeated 12 days later. The dose was increased in increments of 50mg until a dose of 250mg was achieved.

It was seen that time to ovulation was nearly 50% less with stair-step method as compared with that of traditional method (23±1.8 vs 47.5±12.5 days, p<0.001). With 100 mg of CC, ovulation rates were comparable with both methods but was nearly 3 times with 150 mg CC (37% vs 12%, p=0.004) and 4 times with 200mg CC (21% vs 5%, p=0.01), with stair-step method as compared to traditional one.

Once ovulation was achieved, clinical and overall pregnancy rates did not differ between both the methods (16% vs 17%, p>0.05).

Women with stair-step method did experience mild side effects like headaches, vasomotor flushing, mastalgia and GI more frequently; however, incidence of severe side effects were similar in both the groups.

The authors concluded that stair-step method is an efficient and effective method for ovulation induction with CC at significantly decreased time. Authors of a prospective cohort study even cited the stair-step protocol as an alternative to gonadotrophin therapy with similar efficacy.

The abstract was also presented as 70th Annual Meeting of the American Society for Reproductive Medicine, October 18-22, 2014, Honolulu, Hawaii and could be accessed here.

Abstract