A Pilot Study on the Effect of Ovarian Stimulation With r-hLH/r-hFSH, r-hFSH and hMG in Reducing Apoptosis Rate in Cumulus Cells of Patients Undergoing ICSI

HP-hMG, recombinant FSH (r-hFSH) and a combination of r-hFSH/r-hLH, are commonly used for ovarian stimulation in infertile women undergoing IVF/ICSI treatments. Several publications have compared the effectiveness of these compounds, in terms of clinical outcomes . Most of the studies have been performed in women undergoing pituitary down-regulation with a GnRH agonist long protocol, focusing on the outcome after r-hFSH and HP-hMG ovarian stimulation . Two meta-analyses showed a better outcome in terms of live birth rate for HP-hMG ovarian stimulation compared to r-hFSH in the GnRH agonist long protocol. These studies mainly compare different dose regimen of the two drugs used in the same clinical population, r-hFSH and HP-hMG. Recently other two clinical randomized studies compared, in a non-inferiority design, the same dose regimen of the two drugs. The results confirmed non inferiority of the HP-hMG formulation in terms of pregnancy rate compared to the r-hFSH formulations, but significantly higher drug consumption and lower yield in oocyte recovery.

In clinical practice HP-hMG is a clinical favored treatment when LH activity is requested for the ovarian stimulation success, due to LH activity guaranteed by extractive hCG added to this formulation.

Several studies have addressed the issue of the need or convenience of adding LH activity to FSH in ovarian stimulation in IVF/ICSI-ET in order to increase clinical outcomes in IVF/ICSI cycles , but they have not been able to address the role that LH administration plays during the follicular phase of a stimulated cycle for IVF-ET under pituitary suppression. In the case of r-hFSH administration, in normo-gonadotrophic patients, low levels of endogenous LH can persist despite pituitary down-regulation with GnRH analogues. It is known that only 1% of LH receptors need to be occupied to drive adequate ovarian steroidogenesis for reproduction. But the potential benefit of additional exogenous LH supplementation in ART is still controversial .

Different meta-analyses did not demonstrate any benefit of the r-hLH supplementation in increasing clinical outcome . However, in patients of advanced age undergoing ART, likely to include a larger proportion of poor responders, the addition of r-hLH seems to be beneficial .

In a previous study, the investigators demonstrated that r-hLH supplementation during ovarian stimulation, significantly reduces apoptosis in the cumulus cells, improving oocyte competence that is necessary for adequate fertilization and the consecutive embryogenesis that ends with implantation.