Introduction: Physical activity reduces the risk of breast cancer. However, the potential role of physical activity in recurrence of breast cancer is not well established. The aim of our study is to examine the association between physical activity and risk of recurrent breast cancer. Methods: Data was obtained from the Global Epidemiological Study (GES). The GES is an IRB approved multinational biorepository and database to assess cancer and other disease risk factors and biomarkers. In-person interviews of all subjects provided demographics, family-history and other disease related information including age, BMI, diet and physical activity. For statistical analyses, t-tests were used for continuous variables and chi-square tests for categorical variables. The association between recurrent breast cancer and physical activity was assessed using logistic regression in univariate and multivariate analyses. Results: From a total of 2435 breast cancer subjects 215 had recurrent breast cancer. The average age of subjects without recurrence was 55.62 years and those with breast cancer recurrence was 58.35 years. In univariate analysis, subjects in the highest tertile of physical activity were 39% less likely to have recurrent breast cancer compared to those who reported no physical activity [Odds Ratio: 0.61, 95% Confidence Interval: 0.40-0.93]. In multivariate analysis, subjects in the highest tertile of physical activity were 45% less likely to have recurrent breast cancer compared to those who reported no physical activity [Odds Ratio: 0.55, 95% Confidence Interval: 0.34-0.89] after adjusting for age, BMI and cancer-stage. A statistically significant dose-response for physical-activity and reduced risk of recurrent breast cancer was observed with a P-value for trend of 0.05. Conclusion: Our study suggests that physical activity reduces the risk of recurrence of breast cancer. Further studies with larger sample size are needed to confirm our findings.
Citation Format: Teresa A. Lehman, Ramakrishna V. Modali, Luke D. Ratnasinghe. Recurrent breast cancer risk and physical activity. [abstract]. In: Proceedings of the 107th Annual Meeting of the American Association for Cancer Research; 2016 Apr 16-20; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2016;76(14 Suppl):Abstract nr 3426.