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pubmed:otherAbstract |
PIP: The effect of 3 intermittent dose and schedules of RU486 in cycling women was studied to examine the effect of the anti-progestin on follicular development. 25 mg RU486 given weekly to monkeys blocks ovulation. Here 9 Chilean women aged 26-36 who were protected by IUD or sterilization took either 10 or 50 mg RU486 weekly for 5 weeks (3 women each) or 50 mg for 3 consecutive days every 10 days for 80 days (3 women). All treatments were begun on cycle days 1-3. Serum estradiol, progesterone, RU486, ovarian ultrasound, LH, FSH and endometrial biopsies were followed. In group 1 follicular development was delayed, as estradiol and progesterone levels were suppressed until the day of the last dose of RU486. In group 2 there were variable responses: complete suppression of follicular development, defective luteinization, and normal luteal development. In group 3 estradiol and progesterone were suppressed and follicular development proceeded in waves of development and collapse of dominant follicles. No distinct LH surge appeared, however. Thus intermittent RU486 failed to consistently inhibit follicular development in this small preliminary study.
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