• Jie Li, Feng Zhang, Wenchun Wang, Rizhao Pang, Jiancheng Liu, Qiuhong Man, and Anren Zhang.
• Acupuncture and Tuina School, Chengdu University of Traditional Chinese Medicine, Chengdu, China.
• BMJ Open. 2021 Feb 4; 11 (2): e041588.

BackgroundPatients with breast cancer often experience severe psychological distress, especially anxiety and depression, leading to poorer quality of life, shortened survival time and increased mortality.The objective of the review will be to summarise data on the prevalence and risk factors of anxiety and depression in patients with breast cancer.Methods And AnalysisTwo reviewers will be applied in seven databases, including Web of Science, PubMed, EMBASE, Wan Fang Data Knowledge Service Platform, Chinese Biomedical Literature Database, Chinese Scientific Journal Database (VIP database), China National Knowledge Infrastructure and for studies on the prevalence and risk factors of depression in patients with breast cancer, which should be published from inception to Feb 2020 in English, Chinese, French and Spanish. The selection of studies, data extraction and risk of bias assessment will be done independently by two reviewers. Data synthesis will be carried out using RevMan V.5.3 software. The heterogeneity will be determined by the I² test. Publication bias will be evaluated by generating a funnel plot and performing the Begg and Egger test. The quality of the systematic review will be assessed using the Grading of Recommendations Assessment, Development and Evaluation Tool criteria.Ethics And DisseminationNo ethical approval is required. This protocol will not involve individual patient information and endangering participant rights. The results will be reported in a peer-reviewed journal or disseminated in relevant conferences.Osf Registration NumberDOI 10.17605/OSF.IO/D6A4P.© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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