Body size throughout the life-course and incident benign prostatic hyperplasia-related outcomes and nocturia.

Existing evidence suggests that there is an association between body size and prevalent Benign Prostatic Hyperplasia (BPH)-related outcomes and nocturia. However, there is limited evidence on the association between body size throughout the life-course and incident BPH-related outcomes.

Our study population consisted of men without histories of prostate cancer, BPH-related outcomes, or nocturia in the intervention arm of the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial (PLCO) (n = 4710). Associations for body size in early- (age 20), mid- (age 50) and late-life (age ≥ 55, mean age 60.7 years) and weight change with incident BPH-related outcomes (including self-reported nocturia and physician diagnosis of BPH, digital rectal examination-estimated prostate volume ≥ 30 cc, and prostate-specific antigen [PSA] concentration > 1.4 ng/mL) were examined using Poisson regression with robust variance estimation.

Men who were obese in late-life were 25% more likely to report nocturia (Relative Risk (RR): 1.25, 95% Confidence Interval (CI): 1.11-1.40; p-trendfor continuous BMI < 0.0001) and men who were either overweight or obese in late-life were more likely to report a prostate volume ≥ 30 cc (RRoverweight: 1.13, 95% CI 1.07-1.21; RRobese: 1.10, 95% CI 1.02-1.19; p-trendfor continuous BMI = 0.017) as compared to normal weight men. Obesity at ages 20 and 50 was similarly associated with both nocturia and prostate volume ≥ 30 cc. Considering trajectories of body size, men who were normal weight at age 20 and became overweight or obese by later-life had increased risks of nocturia (RRnormal to overweight: 1.09, 95% CI 0.98-1.22; RRnormal to obese: 1.28, 95% CI 1.10-1.47) and a prostate volume ≥ 30 cc (RRnormal to overweight: 1.12, 95% CI 1.05-1.20). Too few men were obese early in life to examine the independent effect of early-life body size. Later-life body size modified the association between physical activity and nocturia.

We found that later-life body size, independent of early-life body size, was associated with adverse BPH outcomes, suggesting that interventions to reduce body size even late in life can potentially reduce the burden of BPH-related outcomes and nocturia.

BMC urology. 2021 Mar 27*** epublish ***

Saira Khan, K Y Wolin, R Pakpahan, R L Grubb, G A Colditz, L Ragard, J Mabie, B N Breyer, G L Andriole, S Sutcliffe

Epidemiology Program, College of Health Sciences, University of Delaware, 100 Discovery Blvd., 7th floor, Newark, DE, 19713, USA. ., Coeus Health, 222 W Merchandise Mart Plaza, Chicago, IL, 60654, USA., Division of Public Health Sciences, Department of Surgery, Washington University in St. Louis School of Medicine, 660 S. Euclid Ave., Campus Box 8100, St. Louis, MO, 63110, USA., Department of Urology, Medical University of South Carolina, 135 Rutledge Ave, Charleston, SC, 29425, USA., Westat, 1600 Research Blvd, Rockville, MD, 20850, USA., Information Management Services, Inc., 1455 Research Blvd, Suite 315 , Rockville, MD, 20850, USA., Departments of Urology and Epidemiology and Biostatistics, University of California - San Francisco, 400 Parnassus Ave # 610, San Francisco, CA, 94143, USA., Division of Urologic Surgery, Department of Surgery, Washington University in St. Louis School of Medicine, 4921 Parkway Place, St. Louis, MO, 63110, USA.