VOLUME 114, ISSUE 2, P321-330
Craig A. Witz, M.D., Gaurang S. Daftary, M.D., M.B.A., Kevin J. Doody, M.D., John K. Park, M.D., M.S., M.Sc., Yodit Seifu, Ph.D., Vladimir I. Yankov, M.D., Patrick W. Heiser, Ph.D., on behalf of the Menopur in GnRH Antagonist Cycles with Single Embryo Transfer – High Responder (MEGASET-HR) Trial Group
To evaluate the efficacy and safety of highly purified human menotropin (HP-hMG) and recombinant follicle-stimulating hormone (rFSH) for controlled ovarian stimulation in a population of patients predicted to be high responders.
Randomized, open-label, assessor-blinded, parallel-group, noninferiority trial.
A total of 620 women with serum antimüllerian hormone (AMH) ≥5 ng/mL.
Controlled ovarian stimulation with HP-hMG or rFSH in a GnRH antagonist assisted reproductive technology (ART) cycle. Fresh transfer of a single blastocyst was performed unless ovarian response was excessive, in which all embryos were cryopreserved. Subjects could undergo subsequent frozen blastocyst transfer within 6 months of randomization.
Main Outcome Measure(s)
Ongoing pregnancy rate (OPR) after fresh transfer (primary endpoint), as well as cumulative live birth, ovarian hyperstimulation syndrome (OHSS), and pregnancy loss rates.
OPR/cycle start after fresh transfer was 35.5% with HP-hMG and 30.7% with rFSH (difference: 4.7%, 95% CI −2.7%, 12.1%); noninferiority was established. Compared to rFSH, HP-hMG was associated with significantly lower OHSS (21.4% vs. 9.7% respectively; difference: −11.7%, 95% CI −17.3%, −6.1%) and cumulative early pregnancy loss rates (25.5% vs. 14.5% respectively; difference: −11.0%, 95% CI −18.8%, −3.14%). Despite 43 more transfers in the rFSH group, cumulative live birth rates were similar with HP-hMG and rFSH at 50.6% and 51.5% respectively (difference: −0.8%, 95% CI −8.7%, 7.1%).
In high responders, HP-hMG provided comparable efficacy to rFSH with fewer adverse events, including pregnancy loss, suggesting its optimized risk/benefit profile in this population.