Association of cytokines with quality of life among breast cancer survivors: A randomized pilot study exploring the effect of Tai Chi Chuan
e20556 Background: While advances in cancer treatment can increase breast cancer (BC) survival, cancer treatment side effects can decrease quality of life (QOL). Cancer cardiotoxicity is a major side effect of chemotherapy and radiotherapy that leads to cardiovascular disease (CVD). The combined burden of cancer and cancer cardiotoxicity drastically affects QOL. Cytokine-mediated inflammatory profiles are dysregulated by cancer treatments and are implicated in the pathogenesis of CVD. Tai Chi Chuan (TCC), an exercise mode with an energy expenditure equivalent to brisk walking, has been shown to improve cardiovascular function and QOL among BC survivors. The purpose of this pilot study was to explore how TCC affects cytokines and how cytokine changes are related to QOL changes among BC survivors. Methods: This pilot study compared the effects of 12 weeks (3, 60 min. sessions/week) of TCC with support therapy on IL-2 and IL-8 and on QOL among 21 BC survivors (mean age=51; range 33–78). Cytokine responses were obtained via serum ELISA and QOL were assessed via the FACIT measurement system pre- and post-intervention. Results: Mean levels of IL-2 decreased in the TCC group (CS=-8.82) but increased in the control group (CS=4.60). Mean levels of IL-8 increased in the TCC group (CS=0.32) but decreased in the control group (CS=-3.82). ANCOVA, controlling for baseline, revealed no treatment effect for IL-2 but there was a statistical trend suggesting a possible treatment effect and baseline interaction for IL-8 (p=0.1). Bivariate analyses revealed a negative association between overall QOL and IL-8 (p=0.07), functional QOL (e.g. ability to work) and IL-8 (p=0.03), as well as physical QOL (e.g. energy level) and IL-8 (p=0.01) in the TCC group. Correlations also showed a negative association between overall QOL and IL-2 (p=0.05) and between functional QOL and IL-2 (p=0.005) among the control group. Conclusions: These findings suggest that TCC-induced changes in cytokines may be associated with changes in QOL, specifically in the physical and functional domains. Future research is needed to verify these pilot study findings and should focus on cardiotoxic effects associated with physical and functional QOL. NCI grant 1R25-CA102618 and Sally Schindel Cone. No significant financial relationships to disclose.