Clinical Outcomes in WHO Type I Anovulatory Women Using r-hFSH+r-hLH in a 2:1 Ratio or hMG-HP

World Health Organization (WHO) type I hypogonadotropic anovulation (hypogonadotropic hypogonadism, HH) is a rare alteration of the reproductive system with absent or decreased function of the gonads, caused by congenital, including genetic, or acquired reduced hypothalamic or pituitary activity. This results in abnormally low serum levels of Follicular Stimulation Hormone (FSH) and Luteinizing Hormone (LH) and negligible oestrogen (E2) activity.

The most convenient treatment is daily injections of exogenous gonadotropins that has been proven to be effective.

Patients lacking an effective hypothalamic-pituitary activity (WHO type I anovulation) do not produce sufficient threshold levels of endogenous LH, which is required to obtain optimal follicular development and steroidogenesis when treated with FSH alone. Therefore a combination therapy with adequate doses of both FSH and LH in an optimal ratio is required in order to restore fertility.

The LH activity could be produced by LH itself or by human Chorionic Gonadotropin (hCG) and the two gonadotropins are available to be used in the WHO type I patients in two different formulations both in indication for this type of patients. It would be worth of interest to assess if these two different formulations could elicit the same clinical outcomes in standard clinical practice or not.

The aim of the study is to compare the efficacy and safety of recombinant human FSH and recombinant human LH (r-hFSH+r-hLH) in a 2:1 ratio with human Menopausal Gonadotropin Highly Purified (hMG-HP), containing LH-like activity, in women with severe LH and FSH deficiency (WHO type I anovulation, HH).

All patients were diagnosed with HH according to a negative progesterone (P4) challenge test, serum LH<1.2 IU/L and FSH <5 IU/L, a transvaginal ultrasound showing a uterus with a midline echo, no ovarian tumor or cyst and ≤ 13 small follicles (mean diameter ≤ 10millimeters (mm)) on the largest section through each ovary, a Body Mass Index (BMI) between 18 and 32 Kilograms for square meters(Kg/m2), and no systemic diseases.

In this open-label monocentric, randomized comparative trial, patients was randomized in two arms in 1:1 ratio, to receive the two different standard clinical practice treatments:

• 1 vial of Pergoveris: (vial/powder 150 International Units (IU) r-hFSH+ 75IU r-hLH)stimulation day 1 until required hCG level is met. The dose can be adjusted at stimulation Day 6 according to subject ovarian response and standard clinical practice
• 2 vials of Menopur: (vial/powder hMG containing 75IU FSH + 75IU LH-like activity). stimulation day 1 until required hCG level is met. The dose can be adjusted at stimulation Day 6 according to subject ovarian response and standard clinical practice Follicular development were monitored according clinical practice by ultrasound (US) and/or estradiol (E2) levels, until the protocol hCG requirement is met (i.e., at least one follicle greater than or equal to 17 mm). After this, a single injection of hCG was administered in order to induce final oocyte maturation.

Main Outcome Measures were ovulation induction as measured by follicular development i.e. follicle ≥ 17 mm, pre-ovulatory E2 ≥ 400 picomole/Liter (pmol/L) and mid-luteal phase Progesterone ≥ 25 nanomole/Liter (nmol/L). Secondary efficacy endpoints included estradiol levels/follicle at mid-cycle, number of follicles at mid-cycle and pregnancy rate (PR).

Drug safety was assessed by monitoring adverse events and the incidence of local reactions after drug injection at local site. Ovarian hyperstimulation syndrome (OHSS) was assessed and recorded according to Golan classification According to this protocol, patients were initially treated for one cycle. If consenting, patients who did not become pregnant during the first cycle were treated for a further optional one or two series of cycles with the same criteria of randomization, i.e. maintaining the same treatment as the previous cycle.