Individual participant data meta-analysis of trials comparing frozen versus fresh embryo transfer strategy (INFORM): a protocol.
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Date
2022
Authors
Wang, R.
McLernon, D.J.
Lai, S.
Showell, M.G.
Chen, Z.-J.
Wei, D.
Legro, R.S.
Wang, Z.
Sun, Y.
Wu, K.
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Journal article
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BMJ Open, 2022; 12(7):e062578-1-e062578-7
Statement of Responsibility
Rui Wang, David J McLernon, Shimona Lai, Marian G Showell, Zi-Jiang Chen, Daimin Wei, Richard S Legro, Ze Wang, Yun Sun, Keliang Wu, Lan N Vuong, Pollyanna Hardy, Anja Pinborg, Sacha Stormlund, Xavier Santamaría, Carlos Simón, Christophe Blockeel, Femke Mol, Anna P Ferraretti, Bruce S Shapiro, Forest C Garner, Rong Li, Christos A Venetis, Ben W Mol, Siladitya Bhattacharya, Abha Maheshwari, The INFORM Collaboration
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Abstract
Introduction: Existing randomised controlled trials (RCTs) comparing a freeze-all embryo transfer strategy and a fresh embryo transfer strategy have shown conflicting results. A freeze-all or a fresh transfer policy may be preferable for some couples undergoing in-vitro fertilisation (IVF), but it is unclear which couples would benefit most from each policy, how and under which protocols. Therefore, we plan a systematic review and individual participant data meta-analysis of RCTs comparing a freeze-all and a fresh transfer policy. Methods and analysis: We will search electronic databases (Medline, Embase, PsycINFO and CENTRAL) and trial registries ( ClinicalTrials. gov and the International Clinical Trials Registry Platform) from their inception to present to identify eligible RCTs. We will also check reference lists of relevant papers. The search was performed on 23 September 2020 and will be updated. We will include RCTs comparing a freeze-all embryo transfer strategy and a fresh embryo transfer strategy in couples undergoing IVF. The primary outcome will be live birth resulting from the first embryo transfer. All outcomes listed in the core outcome set for infertility research will be reported. We will invite the lead investigators of eligible trials to join the Individual participant data meta-analysis of trials comparing frozen versus fresh embryo transfer strategy (INFORM) collaboration and share the deidentified individual participant data (IPD) of their trials. We will harmonise the IPD and perform a two-stage meta-analysis and examine treatment–covariate interactions for important baseline characteristics. Ethics and dissemination: The study ethics have been granted by the Monash University Human Research Ethics Committee (Project ID: 30391). The findings will be disseminated via presentations at international conferences and publication in peer-reviewed journals.
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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.