Introduction: Women with early-stage breast cancer (EBC) are commonly required to make treatment decisions. Decision regret regarding treatments is an adverse outcome that negatively affects women's psychological well-being and quality of life. A systematic review will be conducted to synthesise evidence about decision regret among women regarding treatments for EBC. The study will focus on levels of decision regret, what is regretted, and the factors associated with decision regret.
Methods and analysis: A systematic review will be conducted following the Preferred Reporting Items for Systematic Review and Meta-Analysis Protocols 2015 checklist. Electronic databases, including CINAHL Complete, Embase, PubMed, Medline and Web of Science, will be searched for relevant articles published from 2000 to 2021. The reference lists of eligible studies will also be manually searched. All types of quantitative, qualitative and mixed-methods studies that report on decision regret regarding treatments among women with EBC will be included. The primary outcome of this review will be women's levels of decision regret regarding breast cancer treatments. The secondary outcomes will include the content of their regrets, and the factors contributing to decision regret. The methodological quality of the studies will be assessed using the Joanna Briggs Institute appraisal tools. Meta-analysis and thematic synthesis approaches will be used to synthesise quantitative and qualitative data, respectively. A convergent parallel approach will be used to integrate quantitative and qualitative findings.
Ethics and dissemination: Ethical approval is not required for this systematic review. The findings of this work will be disseminated at international conferences and peer-reviewed journals. The findings of this systematic review will inform the development of decision interventions to improve the decision outcomes of breast cancer treatments.
Prospero registration number: CRD42021260041.
Keywords: breast neoplasm; factors; meta-analysis; qualitative; regret; systematic review.
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