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Randomized Controlled Trial Comparing Slow-freezing to Vitrification of Oocytes

Information source: Samuel Lunenfeld Research Institute, Mount Sinai Hospital
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Infertility

Intervention: slow-freeze (Procedure); vitrification (Procedure)

Phase: N/A

Status: Terminated

Sponsored by: Samuel Lunenfeld Research Institute, Mount Sinai Hospital

Official(s) and/or principal investigator(s):
Ellen M Greenblatt, MD, FRCS(C), Study Director, Affiliation: Mount Sinai Hospital, Canada


Preservation of fertility is limited. Current methods include embryo cryopreservation and while still experimental, ovarian cryopreservation. In single women who are at risk for infertility secondary to cancer or couples who have ethical reasons to avoid embryo cryopreservation, oocyte cryopreservation is an alternative Purpose of study is to compare slow freeze to vitrification of human oocytes. Successful cryopreservation and subsequent thawing programs are characterized by avoiding ice crystal formation. Vitrification, newer alternative to slow freeze method, process by which water is prevented from forming ice. Our hypothesis is that higher survival rate per oocyte is to be expected in the vitrification group.

Clinical Details

Official title: Cryopreservation of Oocytes: A Randomized Controlled Trial Comparing Slow-freezing to Vitrification

Study design: Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Single Blind (Subject), Primary Purpose: Treatment

Primary outcome: post-thaw oocyte survival rate

Secondary outcome:

fertilization rate


embryo development

implantation rate

ongoing pregnancy

Detailed description: Although several reviews of smaller studies of cryoprotectant methodology exist randomized controlled trials,comparing slow-freeze-rapid-thaw procedure to vitrification of oocytes, are not available. The purpose of this study is to compare these two methods of oocyte cryopreservation in human oocytes.


Minimum age: 18 Years. Maximum age: 37 Years. Gender(s): Female.


Inclusion Criteria:

- 14 or more oocytes at ovum pick up

- age < 38

- bmi < 30

Exclusion Criteria:


Locations and Contacts

Mount Sinai Hospital, Toronto, Ontario M5G 1Z5, Canada
Additional Information

Related publications:

Gook DA, Edgar DH. Human oocyte cryopreservation. Hum Reprod Update. 2007 Nov-Dec;13(6):591-605. Epub 2007 Sep 10. Review.

Porcu E, Venturoli S. Progress with oocyte cryopreservation. Curr Opin Obstet Gynecol. 2006 Jun;18(3):273-9. Review.

Oktay K, Cil AP, Bang H. Efficiency of oocyte cryopreservation: a meta-analysis. Fertil Steril. 2006 Jul;86(1):70-80.

Jain JK, Paulson RJ. Oocyte cryopreservation. Fertil Steril. 2006 Oct;86(4 Suppl):1037-46. Review.

Byrne J, Fears TR, Gail MH, Pee D, Connelly RR, Austin DF, Holmes GF, Holmes FF, Latourette HB, Meigs JW, et al. Early menopause in long-term survivors of cancer during adolescence. Am J Obstet Gynecol. 1992 Mar;166(3):788-93.

Falcone T, Attaran M, Bedaiwy MA, Goldberg JM. Ovarian function preservation in the cancer patient. Fertil Steril. 2004 Feb;81(2):243-57. Review.

Porcu E, Fabbri R, Damiano G, Giunchi S, Fratto R, Ciotti PM, Venturoli S, Flamigni C. Clinical experience and applications of oocyte cryopreservation. Mol Cell Endocrinol. 2000 Nov 27;169(1-2):33-7. Review.

Sonmezer M, Oktay K. Fertility preservation in young women undergoing breast cancer therapy. Oncologist. 2006 May;11(5):422-34. Review.

Yoon TK, Kim TJ, Park SE, Hong SW, Ko JJ, Chung HM, Cha KY. Live births after vitrification of oocytes in a stimulated in vitro fertilization-embryo transfer program. Fertil Steril. 2003 Jun;79(6):1323-6.

Starting date: August 2008
Last updated: January 6, 2014

Page last updated: August 23, 2015

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