Physical activity and survival among Hispanic and non-Hispanic white long-term breast cancer survivors and population-based controls

Purpose We investigated the association of physical activity with survival for 601 Hispanic women and 682 non-Hispanic white women who participated in the population-based breast cancer case-control New Mexico Women's Health Study. Methods We identified 240 deaths among cases diagnosed with a first primary invasive breast cancer between 1992 and 1994, and 88 deaths among controls. Follow-up extended through 2012 for cases and 2008 for controls. Multivariable hazard ratios (HRs) and 95 % confidence intervals (CIs) were estimated using Cox proportional hazards regression. Results Higher levels of total physical activity were inversely associated with all-cause mortality among Hispanic cases (Quartile (Q)4: HR = 0.55, 95 % CI 0.31-0.99). A non-significant trend was observed for recreational activity in Hispanic cases also (Q4: HR = 0.50, 95 % CI 0.23-1.09, p for trend = 0.08). No significant associations were noted for non-Hispanic white cases or for controls. Conclusions The results suggest that increasing physical activity may be protective against mortality in Hispanic women with breast cancer, despite reporting lower levels of recreational activity than non-Hispanic white women or Hispanic controls.