Abstract
Purpose
The purpose of the study is to explore testicular sperm cryopreservation in patients with nonobstructive azoospermia (NOA) whether affect the outcome of subsequent intracytoplasmic sperm injection (ICSI).
Methods
A systematic review and meta-analysis was conducted by searching the MEDLINE and EMBASE databases for relevant published studies in English language (1997–2017). Studies were eligible if they included the comparison of using fresh and frozen-thawed testicular sperm followed by ICSI. Two reviewers independently performed data extraction, quality assessment and assessed the risk of bias. The overall summary risk estimated the number of events. A meta-analysis was conducted using a random effects or fixed effects model analysis according to the test of heterogeneity.
Results
A total of 17 studies with 1,261 ICSI cycles were identified. Analysis of the present data showed no difference in the fertilization outcome when comparing fresh versus frozen-thawed spermatozoa (RR = 1.02, 95% CI 0.86–1.09). Similarly, no difference in CR (RR = 1.01, 95% CI 0.96–1.05), good embryo rate (RR = 1.01, 95% CI 0.95–1.09), and IR (RR = 0.93, 95% CI 0.66–1.30) was observed if the spermatozoa was fresh or frozen-thawed. Finally, no difference in CPR or LBR was noted when using fresh or frozen-thawed cycles were analyzed separately (RR = 1.03, 95% CI 0.86–1.24; RR 1.11, 95% CI 0.88–1.41, respectively).
Conclusions
In men with NOA, the ICSI outcome is not affected by whether the retrieved testicular sperm is fresh or frozen. Sperm cryopreservation ought to be considered in every surgical sperm retrieval case, which remain feasible even in patients with few testicular sperm retrieved.
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Acknowledgments
This work was supported by grants from the Nation Natural Science Foundation of China (No. 81501246, No. 81501020) and Graduates'’ Innovation Fund, Huazhong University of Science and Technology (No. 5003540054).
Authors’ roles
ZY made substantial contributions to define the research question, acquisition and analyses of data as well as manuscript preparation. ZY and ZWW designed the strategy for literature search, acquisition and interpretation of data. JY and TW assessed eligibility of studies for inclusion to the systematic review. Statistical analyses were performed by HYJ, HL and ZT. SGW and JHL contributed to revision of the manuscript and final approval. All authors read and approved the final version of the manuscript.
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Yu, Z., Wei, Z., Yang, J. et al. Comparison of intracytoplasmic sperm injection outcome with fresh versus frozen-thawed testicular sperm in men with nonobstructive azoospermia: a systematic review and meta-analysis. J Assist Reprod Genet 35, 1247–1257 (2018). https://doi.org/10.1007/s10815-018-1206-5
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DOI: https://doi.org/10.1007/s10815-018-1206-5