Body mass index and incidence of localized and advanced prostate cancer—a dose–response meta-analysis of prospective studies

• Published in: Annals of oncology Vol. 23; no. 7; pp. 1665 - 1671
• Main Authors: Discacciati, A., Orsini, N., Wolk, A.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-07-2012; Oxford University Press
• Subjects: Antineoplastic agents; Biological and medical sciences; Body Mass Index; dose–response relationship; Gynecology. Andrology. Obstetrics; Humans; Incidence; Male; Male genital diseases; Medical sciences; Medicin och hälsovetenskap; meta-analysis; Neoplasm Grading; Nephrology. Urinary tract diseases; Obesity - complications; Obesity - epidemiology; Obesity - pathology; Pharmacology. Drug treatments; Prospective Studies; prostate cancer; Prostatic Neoplasms - epidemiology; Prostatic Neoplasms - etiology; Prostatic Neoplasms - pathology; Risk Factors; systematic review; Tumors; Tumors of the urinary system; Urinary tract. Prostate gland; meta-analysis; prostate cancer; dose–response relationship; systematic review; body mass index; Urinary system disease; Prostate disease; Systematic review; Early stage; Malignant tumor; Review; Epidemiology; Incidence; Metaanalysis; Dose activity relation; Prospective; Body mass index; Advanced stage; dose-response relationship; Male genital diseases; Prostate cancer; Localized; Cancer
• DOI: 10.1093/annonc/mdr603
• EISSN: 1569-8041
• ISSN: 0923-7534; 1569-8041

The relationship between obesity and risk of prostate cancer (PCa) is unclear; however, etiologic heterogeneity by subtype of PCa (localized, advanced) related to obesity was suggested. Therefore, we conducted a dose–response meta-analysis of prospective studies to assess the association between body mass index (BMI) and risk of localized and advanced PCa.
Relevant prospective studies were identified by a search of Medline and Embase databases to 03 October 2011. Twelve studies on localized PCa (1 033 009 men, 19 130 cases) and 13 on advanced PCa (1 080 790 men, 7067 cases) were identified. We carried out a dose–response meta-analysis using random-effects model.
For localized PCa, we observed an inverse linear relationship with BMI [Ptrend < 0.001, relative risk (RR): 0.94 (95% confidence interval, 95% CI, 0.91–0.97) for every 5 kg/m2 increase]; there was no evidence of heterogeneity (Pheterogeneity = 0.27). For advanced PCa, we observed a linear direct relationship with BMI (Ptrend = 0.001, RR: 1.09 (95% CI 1.02–1.16) for every 5 kg/m2 increase); there was weak evidence of heterogeneity (Pheterogeneity = 0.08). Omitting one study that contributed substantially to the heterogeneity yielded a pooled RR of 1.07 (95% CI 1.01–1.13) for every 5 kg/m2 increase (Pheterogeneity = 0.26).
The quantitative summary of the accumulated evidence indicates that obesity may have a dual effect on PCa—a decreased risk for localized PCa and an increased risk for advanced PCa.