ABSTRACT
The development of an effective oocyte-freezing program will have a major impact on
clinical practice in reproductive medicine and will serve as a powerful tool to preserve
fertility for teenage girls and young women without male partners or for those individuals
who are affected by malignancies. It will also be beneficial to infertile couples
who have moral or religious objections about embryo cryopreservation. In addition,
a successful oocyte cryopreservation program will eliminate the need for donor and
recipient menstrual cycle synchronization and will enable the establishment of oocyte
banks, which would facilitate the logistics of coordinating egg donors with recipients.
Recent advances in vitrification technology have markedly improved the oocyte survival
rate after thawing, and the pregnancy rate is comparable with that achieved with fresh
oocytes. However, most studies were performed using in vivo matured oocytes for vitrification.
The objective of this article was to review whether immature and in vitro matured
human oocytes can be vitrified successfully. The results indicated that although healthy
live births can be achieved from the combination of in vitro maturation (IVM) oocytes
and vitrification, vitrification of in vitro matured oocytes is less effective than
vitrification of in vivo matured oocytes. The results suggest that oocytes should
be vitrified at the mature metaphase II stage following IVM rather than at the immature
germinal vesicle (GV) stage because the potential of oocyte maturation is reduced
by the vitrification of immature oocytes at the GV stage.
KEYWORDS
Oocytes - vitrification - cryopreservation - cancer - female fertility
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Ri-Cheng ChianPh.D.
Royal Victoria Hospital Women's Pavilion F3-36
687 Pine Avenue West, Montreal, Quebec, Canada H3A 1A1
eMail: ri-cheng.chian@muhc.mcgill.ca