Michael Liss1, Loki Natarajan2,3, Aws Hasan4, Jonathan L Noguchi4, Martha White2,3, J Kellogg Parsons4. 1. Department of Urology, University of Texas Health Science Center, San Antonio, Tex, La Jolla, Calif., USA. 2. Department of Surgery, South Texas Veterans Affaires Healthcare, San Antonio, Tex, La Jolla, Calif., USA. 3. Division of Urologic Oncology, Moores Comprehensive Cancer Center, La Jolla, Calif., USA. 4. Division of Urology, San Diego Veterans Affairs Medical Center, University of California, San Diego, Calif., USA.
Abstract
BACKGROUND: To investigate associations of kidney cancer mortality with modifiable risk factors of obesity, physical activity, and smoking. METHODS: We evaluate baseline data from US National Health Information Survey from 1998 through 2004 linked to mortality data reporting deaths through 2006. The primary outcome variable was kidney cancer-specific mortality and primary exposure variables were self-reported physical activity and body mass index (BMI). We utilized multivariable adjusted Cox proportional hazards regression models, with delayed entry to account for age at survey interview. RESULTS: Among 222,163 individuals with complete follow-up data we identified 71 kidney cancer-specific deaths. In multivariate analyses, individuals who reported "any physical activity" were 50% less likely [adjusted hazard ratio (adjusted HR) 0.50, 95% CI 0.27-0.93, p = 0.028] to die of kidney cancer than non-exercisers, while obese individuals (BMI ≥ 30 kg/m2) were nearly 3 times more likely (adjusted HR 2.84, 95% CI 1.30-6.23, p = 0.009) compared to those of normal weight (BMI < 25 kg/m2). Compared to never smokers, former smokers were twice as likely to die of kidney cancer (adjusted HR 2.00, 95% CI 1.05-3.80, p = 0.034). CONCLUSION: Physical activity decreases and obesity increases the risk of kidney cancer mortality.
BACKGROUND: To investigate associations of kidney cancer mortality with modifiable risk factors of obesity, physical activity, and smoking. METHODS: We evaluate baseline data from US National Health Information Survey from 1998 through 2004 linked to mortality data reporting deaths through 2006. The primary outcome variable was kidney cancer-specific mortality and primary exposure variables were self-reported physical activity and body mass index (BMI). We utilized multivariable adjusted Cox proportional hazards regression models, with delayed entry to account for age at survey interview. RESULTS: Among 222,163 individuals with complete follow-up data we identified 71 kidney cancer-specific deaths. In multivariate analyses, individuals who reported "any physical activity" were 50% less likely [adjusted hazard ratio (adjusted HR) 0.50, 95% CI 0.27-0.93, p = 0.028] to die of kidney cancer than non-exercisers, while obese individuals (BMI ≥ 30 kg/m2) were nearly 3 times more likely (adjusted HR 2.84, 95% CI 1.30-6.23, p = 0.009) compared to those of normal weight (BMI < 25 kg/m2). Compared to never smokers, former smokers were twice as likely to die of kidney cancer (adjusted HR 2.00, 95% CI 1.05-3.80, p = 0.034). CONCLUSION: Physical activity decreases and obesity increases the risk of kidney cancer mortality.
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