Follicular steroidogenesis in random start protocols for oocyte cryopreservation

Area of Science:

• Reproductive Endocrinology
• Oncofertility
• Ovarian Stimulation

Background:

• Random start protocols are frequently employed for oocyte cryopreservation in women undergoing cancer treatment.
• While generally effective, concerns persist regarding potential sub-optimal cycle outcomes.
• Evidence comparing cycle initiation in different menstrual phases is limited.

Purpose of the Study:

• To compare follicular steroidogenesis in women initiating random start protocols during the luteal versus follicular phase.
• To evaluate the impact of menstrual cycle phase on the endocrine microenvironment of oocytes.

Main Methods:

• Prospective recruitment of women with cancer undergoing oocyte cryopreservation.
• Standardized ovarian stimulation with recombinant FSH and GnRH antagonists.
• Follicular fluid analysis of 15 steroid hormones using liquid chromatography-tandem mass spectrometry.

Main Results:

• Seventy-one women were included; 33 initiated in the luteal phase and 38 in the follicular phase.
• No significant differences were observed in baseline characteristics or oocyte cryopreservation cycle outcomes.
• Concentrations of all 15 measured steroid hormones in follicular fluid did not differ between groups.

Conclusions:

• Initiation phase of random start protocols does not significantly alter follicular steroidogenesis.
• The endocrine microenvironment of oocytes is consistent across menstrual cycle initiation phases.
• Findings support the established efficacy and flexibility of random start protocols for fertility preservation.