Abstract
BACKGROUND: Previous studies regarding mind-body exercise among people with breast cancer mostly focused on one type of mind-body exercise and provided conflicting results. AIMS: This paper aims to systematically synthesize the evidence hierarchy and examine the credibility of previous meta-analyses of different types of mind-body exercises. METHODS: We searched PubMed, Embase, Cochrane Library, Web of Science, and Epitemonikos from database inception to February 2nd, 2024, for meta-analyses of randomized controlled trials. Included meta-analyses examined the effects of mind-body exercises on at least one outcome of health-related quality of life, cancer-related fatigue, depression, anxiety, and sleep quality in breast cancer patients. The random effects estimates (Hedges'G), 95% prediction interval, small study effect, and excess significance bias were calculated. Furthermore, we categorized meta-analyses based on the evidence credibility criteria and assessed quality using A Measurement Tool to Assess Systematic Reviews 2. RESULTS: The umbrella review included a re-analysis of 16 meta-analyses of 9 articles including 134 randomized controlled trials involving 9469 breast cancer patients and survivors. We identified 3 articles as "low" quality and 6 articles as "critically low" quality. Convincing evidence supported the effectiveness of Yoga intervention in reducing depression symptoms (G = -0.77, 95% Confidence Interval [-0.93, -0.61]). However, 11 meta-analyses were supported by weak evidence (1 for Qigong alleviated depression, 4 for Qigong, Baduanjin, Tai Chi Chuan, and Yoga improved health-related quality of life, 3 for multiple mind-body exercises, Tai Chi Chuan, and Yoga reduced cancer-related fatigue, 2 of Baduanjin and Yoga reduced anxiety, as well as 1 of Yoga improved sleep quality). LINKING EVIDENCE TO ACTION: Mind-body exercises, especially yoga, may be beneficial for improving health-related quality of life and mental health for breast cancer patients. Further high-quality interventions investigating diverse mind-body exercise interventions are warranted to ascertain the effectiveness of health-related quality of life and mental health outcomes.