Progestin primed ovarian stimulation (PPOS) has been shown to be effective in avoiding premature spontaneous ovulation, without affecting the number of retrieved oocytes or the quality of the embryos obtained. The utilization of progestins permits lower costs, an easier administration (oral assumption instead of injections) and a tight control over LH levels. Hence the PPOS may be a valid alternative to the standard ovarian stimulation protocols. Additionally, it may be anticipated some degree of superiority of PPOS in particular categories of patients: donors, women at risk of OHSS, women who preserve their as well as poor responder or suboptimal responders for whom oocytes/embryo accumulation or double ovarian stimulation protocols are proposed The aim of this trial will be to investigate the use of Desogestrel in controlling the LH surge during ovarian stimulation in IVF/ICSI cycles. This study is a noninferiority trial in which the the primary efficacy endpoint will be the number of oocytes retrieved per patient. Sample size calculation was performed with the assumptions that the non-inferiority margin is corresponding to three or less oocytes . With the objective to demonstrate that the difference in average number of oocytes retrieved between the Desogestrel and the ganirelix groups would not exceed three, the power for a comparison between the two groups would be equal to 87% for 75 evaluable patients in each treatment groups (for an allocation of 1:1 and a total sample size of 150). To allocate at least 150 patients, an additional 10% to cover possible dropping out were planned to allocate. A total of 165 patients will be included in this study Patients will be assigned to either the study or the control group. The study group will be administered follitropin alfa (Bemfola 150-225 IU/die) and Desogestrel (Cerazette 75 mcg daily ) will be started on stimulation day 7 or when the leading follicle will reach 14 mm, whichever comes first. An antagonist protocol will be used for the control group. Patients will be administered follitropin alfa (Bemfola 150 - 225 IU/die) and Ganirelix (Orgalutran 0.25 mg/die) will be started on stimulation day 7 or when the leading follicle will reach 14 mm, whichever comes first. When a diameter of 18 mm is reached, the final stage of oocyte maturation will be triggered with triptorelin 0.2 mg + hCG 1000 U s.c. Fertilization of the aspirated oocytes will be carried out in vitro, by either conventional insemination or ICSI, depending on semen parameters. Viable embryos will be then frozen by means of vitrificaton on the day in which they will reach the blastocyst developmental stage.
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Number of retrieved oocyte
Timeframe: 14 days after ovarian stimulation