Objective: To investigate the associations of pre- and post-diagnostic recreational physical activity, and sitting time with prostate cancer specific mortality (PCSM) among men diagnosed with non-metastatic prostate cancer in the Cancer Prevention Study II Nutrition Cohort.

Methods: 10,067 men were diagnosed with non-metastatic prostate cancer between enrollment in 1992 or 1993 and June 2011, of whom 600 died of prostate cancer during follow-up through 2012. Multivariable-adjusted Cox proportional hazards regression models were used to calculate hazard ratios (HRs) and 95% confidence intervals (CIs) for the associations of self-reported pre-diagnostic and post-diagnostic physical activity and sitting time with PCSM.

Results: Compared with engaging in fewer than 3.5 metabolic equivalent (MET) hours per week of recreational physical activity, 17.5 or more MET hours (equivalent to 5 hours of walking) per week was associated with 30% lower risk of PCSM (HR: 0.70, 95% CI: 0.54-0.92) for pre-diagnostic, and with 34% lower risk (HR: 0.66, 95% CI: 0.46-0.93) for post-diagnostic recreational physical activity. Among men with walking as the only form of leisure time physical activity, walking 4 hours or more per week before diagnosis was associated with lower risk of PCSM (for 4-6 hours, HR: 0.65, 95% CI: 0.46-0.91; for 7+ hours, HR: 0.60, 95% CI: 0.41-0.88), while no statistically significant association was observed with walking after diagnosis. Sitting time was not associated with PCSM.

Conclusion: Higher recreational physical activity levels before and after diagnosis may improve prognosis in men diagnosed with non-metastatic prostate cancer. These results additional support that prostate cancer survivors should adhere to physical activity guidelines and that physicians should promote adopting a physically active lifestyle to prostate cancer survivors.

Citation Format: Ying Wang, Eric J. Jacobs, Ted Gansler, Marjorie L. McCullough, Victoria L. Stevens, Susan M. Gapstur, Alpa V. Patel. Physical activity, sitting time and prostate cancer specific mortality: The Cancer Prevention Study II Nutrition Cohort. [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 1736.