Effectiveness of Peer Support on Quality of Life and Anxiety in Breast Cancer Patients: A Systematic Review and Meta-Analysis

Background: Breast cancer patients report high levels of psychosocial maladjustment after hospital discharge. Peer support may play an important role in improving anxiety and quality of life in breast cancer patients. This study aimed to assess the effect of peer support on quality of life and anxiety in breast cancer patients. Method: A systematic review and meta-analysis of randomized controlled studies were conducted, using data sourced from PubMed, Embase, Cochrane Central Register of Controlled Trials, Web of Science, SinoMed, China Science and Technology Periodical Database, China National Knowledge Infrastructure, and Wanfang Data for randomized controlled trials (RCTs) from inception to October 15, 2021. The RCTs reporting the effect of peer support intervention on quality of life and anxiety in breast cancer patients were included. The quality of evidence was assessed using the Cochrane risk of bias tool, that is, the Grading of Recommendations Assessment, Development, and Evaluation (GRADE). Standardized mean differences (SMDs) and 95% confidence intervals (CIs) were calculated for the pooled effect size. Results: A total of 14 studies were included in the systematic review and 11 in the meta-analysis. The pooled results revealed that peer support significantly improved quality of life (SMD = 0.69, 95% CI = 0.28–1.11) and anxiety (SMD = −0.45, 95% CI = −0.88 to −0.02) in breast cancer patients. The quality of evidence was low as all studies showed the risk of bias and inconsistency. Conclusion: Peer support intervention has the potential to effectively improve psychosocial adaptations in breast cancer patients. Future studies with a robust design and larger sample size are needed to investigate the potential factors associated with the beneficial effects of peer support.