Abstract | BACKGROUND: Although obesity has been associated with larger prostate volumes (PV), few studies have actually investigated whether obesity enhances PV growth, especially among men using 5α-reductase inhibitors. OBJECTIVE: To examine whether obesity is associated with enhanced PV growth measured by serial transrectal ultrasound (TRUS) measurements. DESIGN, SETTING, AND PARTICIPANTS: We conducted a secondary analysis of the REduction by DUtasteride of prostate Cancer Events (REDUCE) trial, which was originally aimed at cancer risk reduction among high-risk men with a single negative prestudy biopsy. INTERVENTION: Per-protocol randomization to placebo or dutasteride and mandatory TRUS-guided biopsies at 2 yr and 4 yr. OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS: Percentage change in PV at 2 yr and 4 yr from baseline. We tested its association with baseline body mass index (BMI) groups of <25, 25-29.9, and ≥ 30 kg/m(2) using multivariable linear regression. Secondarily, we tested whether BMI was associated with the likelihood of having no PV reduction among men randomized to dutasteride using multivariable logistic regression. RESULTS AND LIMITATIONS: Of 8122 participants, we analyzed 71.8% and 54.5% with complete 2-yr and 4-yr PV data, respectively. In multivariable analysis, men on placebo with BMI ≥ 30 versus < 25 kg/m(2) had enhanced PV growth from baseline (at 2 yr: 17.0% vs 10.7%, p<0.001; at 4 yr: 29.4% vs 20.1%; p=0.001). Men on dutasteride with BMI ≥ 30 versus < 25 kg/m(2) had attenuated PV reduction from baseline (at 2 yr: -14.3% vs -18.5%; p=0.002; at 4 yr: -13.2% vs -19.3%; p=0.001) and higher likelihood of having no PV reduction (at 2 yr: odds ratio [OR]: 1.44; 95% confidence interval [CI], 1.08-1.93; p=0.014; at 4 yr: OR: 1.62; 95% CI, 1.18-2.22; p=0.003). We found no significant interactions between BMI and dutasteride on PV change at 2 yr and 4 yr (p interaction ≥ 0.36). No clinical outcomes or effects of weight change were assessed. CONCLUSIONS:
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Authors | Roberto L Muller, Leah Gerber, Daniel M Moreira, Gerald Andriole Jr, Robert J Hamilton, Neil Fleshner, J Kellogg Parsons, Stephen J Freedland |
Journal | European urology
(Eur Urol)
Vol. 63
Issue 6
Pg. 1115-21
(Jun 2013)
ISSN: 1873-7560 [Electronic] Switzerland |
PMID | 23541458
(Publication Type: Journal Article, Randomized Controlled Trial)
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Copyright | Copyright © 2013 European Association of Urology. All rights reserved. |
Chemical References |
- 5-alpha Reductase Inhibitors
- Azasteroids
- Dutasteride
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Topics |
- 5-alpha Reductase Inhibitors
(therapeutic use)
- Aged
- Azasteroids
(therapeutic use)
- Biopsy
- Body Mass Index
- Dutasteride
- Humans
- Linear Models
- Logistic Models
- Male
- Middle Aged
- Multivariate Analysis
- Obesity
(complications)
- Organ Size
- Prostate
(diagnostic imaging, pathology)
- Prostatic Hyperplasia
(complications, drug therapy, pathology)
- Prostatic Neoplasms
(prevention & control)
- Treatment Outcome
- Ultrasonography
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