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Fertil Steril. 2016 Mar;105(3):755-764.e8. doi: 10.1016/j.fertnstert.2015.11.027. Epub 2015 Dec 10.

Oocyte vitrification as an efficient option for elective fertility preservation.

Author information

1
IVI-Valencia, Institut Universitari IVI, Valencia, Spain. Electronic address: ana.cobo@ivi.es.
2
IVI-Madrid, Universidad Rey Juan Carlos, Madrid, Spain.
3
IVI-Valencia, Institut Universitari IVI, Valencia, Spain.
4
IVI-Las Palmas, Las Palmas, Spain.
5
IVI Foundation, Hospital Universitari i Politècnic La Fe, Valencia, Spain.

Abstract

OBJECTIVE:

To provide a detailed description of the current oocyte vitrification status as a means of elective fertility preservation (EFP).

DESIGN:

Retrospective observational multicenter study.

SETTING:

Private university-affiliated center.

PATIENT(S):

A total of 1,468 women who underwent EFP because of age or having associated a medical condition other than cancer (January 2007 to April 2015).

INTERVENTION(S):

None.

MAIN OUTCOME MEASURE(S):

Survival and cumulative live birth rate (CLBR) per consumed oocyte.

RESULT(S):

Mean age was higher with EFP due to age versus having an associated medical reason (37.7 y [95% confidence interval (CI) 36.5-37.9] vs. 35.7 y [95% CI 34.9-36.3]). In total, 137 patients (9.3%) returned to use their oocytes. Overall survival rate was 85.2% (95% CI 83.2-87.2). Live birth rate per patient was higher in women ≤35 years old than ≥36 years old (50% [95% CI 32.7-67.3] vs. 22.9% [95% CI 14.9-30.9]). CLBR was higher and increased faster in younger women. The gain in CLBR was sharp from 5 (15.4%, 95% CI -4.2 to 35.0) to 8 oocytes (40.8%, 95% CI 13.2-68.4), with an 8.4% gain per additional oocyte, in the ≤35-year-old group. The increase was slower with 10-15 oocytes, reaching a plateau CLBR of 85.2%. A milder increase (4.9% gain) was observed in the ≥36-year-old group (from 5.1% [95% CI -0.6 to 10.7] to 19.9% [95% CI 8.7-31.1] when 5-8 oocytes were consumed), reaching the plateau with 11 oocytes (CLBR 35.6%). Forty babies were born.

CONCLUSION(S):

At least 8-10 metaphase II oocytes are necessary to achieve reasonable success. Numbers should be individualized in women >36 years old. We suggest encouraging women who are motivated exclusively by a desire to postpone childbearing because of age, to come at younger ages to increase success possibilities.

KEYWORDS:

Fertility preservation; live birth; oocyte vitrification; survival rate

[Indexed for MEDLINE]

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