The effects of physical activity on physiological markers in breast cancer survivors: A meta-analysis

BACKGROUND: To systematically evaluate the effects of physical activity on physiological markers in breast cancer survivors. METHODS: A systematic search of the PubMed, Wed of Science, Medline, CNKI and Wanfang Database was performed to identify eligible randomized controlled trials to explore physical activity on physiological markers in breast cancer survivors. STATA version 13.0 (Stata Corp LP, College Station, TX) was used for all statistical analyses. RESULTS: A total of 11 articles with 941 cases were eligible in this meta-analysis. The results of the meta-analysis showed that physical activity could decrease the levels of insulin (SMD = −1.90, 95%CI: −3.2 to −0.60; I(2) = 92.3%, P < .001), insulin-like growth factor 1 (IGF-I) (WMD = −4.67, 95%CI: −23.14 to 13.79; I(2) = 96.2%, P < .001), insulin-like growth factor binding protein-3 (IGFBP-3) (WMD = −20.09, 95%CI: −47.15 to 6.97; I(2) = 93.3%, P < .001). However, compared with the control group, there was not the significant change of insulin-like growth factor 2 (IGF-II), insulin-like growth factor binding protein-1 (IGFBP-1), leptin, adiponectin, glucose, C-reactive protein (CRP), Interleukin-6 (IL-6), Interleukin-10 (IL-10), and tumor necrosis factor alpha (TNF-ɑ) levels after the intervention. CONCLUSIONS: Physical activity could improve the insulin function that might be associated with decreasing the levels of IGF-I, IGFBP-3 and insulin in breast cancer survivors.