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Original Investigation |

5α-Reductase Inhibitors and Risk of High-Grade or Lethal Prostate Cancer

Mark A. Preston, MD, MPH1; Kathryn M. Wilson, ScD2,3; Sarah C. Markt, MPH, ScD2; Rongbin Ge, PhD1; Christopher Morash, MD4; Meir J. Stampfer, MD, ScD2,3; Massimo Loda, MD5,6,7; Edward Giovannucci, MD, ScD2,3,8; Lorelei A. Mucci, ScD2,3; Aria F. Olumi, MD1
[+] Author Affiliations
1Department of Urology, Massachusetts General Hospital, Boston
2Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts
3Channing Division of Network Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts
4Division of Urology, University of Ottawa, Ottawa, Ontario, Canada
5Departments of Pathology and Medical Oncology, Dana-Farber Cancer Institute, Brigham and Women’s and Hospital, Boston, Massachusetts
6Broad Institute of Harvard and MIT, Cambridge, Massachusetts
7Division of Cancer Studies, King’s College London, London, England
8Department of Nutrition, Harvard School of Public Health, Boston, Massachusetts
JAMA Intern Med. 2014;174(8):1301-1307. doi:10.1001/jamainternmed.2014.1600.
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Importance  5α-Reductase inhibitors (5ARIs) are widely used for benign prostatic hyperplasia despite controversy regarding potential risk of high-grade prostate cancer with use. Furthermore, the effect of 5ARIs on progression and prostate cancer death remains unclear.

Objective  To determine the association between 5ARI use and development of high-grade or lethal prostate cancer.

Design, Setting, and Participants  Prospective observational study of 38 058 men followed up for prostate cancer diagnosis and outcomes between 1996 and 2010 in the Health Professionals Follow-up Study.

Exposures  Use of 5ARIs between 1996 and 2010.

Main Outcomes and Measures  Cox proportional hazards models were used to estimate risk of prostate cancer diagnosis or development of lethal disease with 5ARI use, adjusting for possible confounders including prostate specific antigen testing.

Results  During 448 803 person-years of follow-up, we ascertained 3681 incident prostate cancer cases. Of these, 289 were lethal (metastatic or fatal), 456 were high grade (Gleason sum [GS] 8-10), 1238 were GS 7, and 1600 were low grade (GS 2-6). A total of 2878 (7.6%) men reported use of 5ARIs between 1996 and 2010. After adjusting for confounders, men who reported ever using 5ARIs over the study period had a reduced risk of overall prostate cancer (hazard ratio [HR], 0.77; 95% CI, 0.65-0.91). 5ARI users had a reduced risk of GS 7 (HR, 0.67; 95% CI, 0.49-0.91) and low-grade (GS 2-6) prostate cancer (HR, 0.74; 95% CI, 0.57-0.95). 5ARI use was not associated with risk of high-grade (GS 8-10) prostate cancer (HR, 0.97; 95% CI, 0.64-1.46) or lethal disease (HR, 0.99; 95% CI, 0.58-1.69). Increased duration of use was associated with significantly lower risk of overall prostate cancer (HR for 1 year of additional use, 0.95; 95% CI, 0.92-0.99), localized (HR, 0.95; 95% CI, 0.90-1.00), and low-grade disease (HR, 0.92; 95% CI, 0.85-0.99). There was no association for lethal, high-grade, or grade 7 disease.

Conclusions and Relevance  While 5ARI use was not associated with developing high-grade or lethal prostate cancer, it was associated with a reduction in low-grade, GS 7, and overall prostate cancer. Because the number of patients with high-grade or lethal prostate cancer in our cohort was limited, we cannot rule out potential risk of harm with 5ARI use.

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