Evidence map›Paper›PMID 40140886›Full record

SynthesisJournal of ovarian research2025

Comparison of the quality of ovarian tissue cryopreservation by conventional slow cryopreservation and vitrification-a systematic review and meta-analysis.

Qingduo Kong, Cheng Pei, Gohar Rahimi, Peter Mallmann, Volodimir Isachenko

Abstract readComparative StudyMeta-AnalysisSystematic Review
In one paragraph

Synthesis in Journal of ovarian research, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
8citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

8 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. ESHRE recommendations on Good Practice in the IVF laboratory†.Human reproduction (Oxford, England) · 2026
    Guideline
  2. Review
  3. Article
  4. Cryopreservation of Ovarian Cortex Tissue.Methods in molecular biology (Clifton, N.J.) · 2026
    Article
  5. Article
  6. Review
  7. Review
  8. Review
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors.

Qingduo KongDepartment of Obstetrics and Gynecology, Medical Faculty, Cologne University, 50931, Cologne, Germany.
Cheng PeiDepartment of Obstetrics and Gynecology, Medical Faculty, Cologne University, 50931, Cologne, Germany.
Gohar RahimiDepartment of Obstetrics and Gynecology, Medical Faculty, Cologne University, 50931, Cologne, Germany.
Peter MallmannDepartment of Obstetrics and Gynecology, Medical Faculty, Cologne University, 50931, Cologne, Germany.
Volodimir IsachenkoDepartment of Obstetrics and Gynecology, Medical Faculty, Cologne University, 50931, Cologne, Germany. vladimir.isachenko@uk-koeln.de.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundOvarian tissue cryopreservation is increasingly applied in patients undergoing gonadotoxic radiotherapy or chemotherapy treatment or other patients who need to preserve their fertility. However, there is currently limited evidence to know which type of ovarian tissue cryopreservation is better. The advantages and disadvantages of conventional slow cryopreservation and vitrification are still controversial. The purpose of this meta-analysis was to analyze the ovarian tissue quality of ovarian tissue cryopreservation by conventional slow cryopreservation and vitrification.

methodsAccording to the keywords, Pubmed, Embase, and Cochrane Library were searched for studies to January 2024. Studies comparing the follicular viability of conventional slow cryopreservation versus vitrification were assessed for eligibility. The meta-analysis was performed using Stata software (Version 12.0) and Review Manager (Version 5.2).

resultsA total of 18 studies were included in this meta-analysis. The pooled results of the primary outcomes indicated that there was no difference between the two approaches for follicular viability (RR = 0.96, 95% CI: 0.84-1.09, P = 0.520, I

conclusionsConventional slow cryopreservation and vitrification appear to provide comparable outcomes. The heterogeneity of the literature prevents us from comparing these two techniques. Further high-quality studies are needed to enhance this statement. This meta-analysis provides limited data which may help clinicians when counselling patients.

Indexed as

CryopreservationFertility PreservationOvaryVitrificationFemaleHumansOvarian FollicleCryopreservationOvarian folliclesOvary or ovarian tissueVitrification

Identifiers

PMID40140886
PMCPMC11948982

What OpenQuestion holds

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LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.