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Dutasteride for the prevention of prostate cancer in men with high-grade prostatic intraepithelial neoplasia: results of a phase III randomized open-label 3-year trial

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Abstract

Purpose

High-grade prostatic intraepithelial neoplasia (HGPIN) is a potential precursor of prostate cancer (PCa), and patients with HGPIN are at high risk for PCa development. Objective of our study was to evaluate the efficacy of dutasteride 0.5 mg in PCa prevention among men with isolated HGPIN on biopsy.

Methods

This prospective, randomized, phase III, open-label 3-year trial assessed dutasteride versus active surveillance in patients with HGPIN. Patients were randomized to dutasteride 0.5 mg daily or active surveillance. Per-protocol prostate biopsies were performed at 6, 12, 24, and 36 months until cancer detection or study end. The primary end point was cancer-free survival (CFS). An intention-to-treat analysis was done for patients who underwent at least one per-protocol biopsy. An efficacy analysis was done for patients who completed the study. CFS was evaluated using Kaplan–Meier and log-rank analysis.

Results

In total, 220 men were randomized (dutasteride, n = 107; surveillance, n = 113). PCa was detected in 47.6: 49.1 % in the surveillance group and 45.9 % in the treatment group (p = 0.66). The detected PCa differentiation by Gleason score (GS) was GS 6 in 76.9 %, GS 7 in 19.8 %, and GS ≥ 8 in 3.3 %, with no difference between groups. The 3-year PCa-free survival was 43.6 % in the surveillance and 49.6 % in the dutasteride group (log rank p = 0.57). Limitations include a relatively high non-adherence rate, open-label design, and baseline sextant biopsy scheme.

Conclusions

Dutasteride 0.5 mg for 3 years did not lower the PCa detection rate but did not worsen detected PCa characteristics in men with HGPIN.

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Author contributions

Daimantas Milonas had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. D Milonas performed protocol development, data collection, data analysis, and manuscript writing. S Auskalnis participated in data collection and data analysis. G Skulcius and I Gudinaviciene involved in data collection. M Jievaltas wrote the manuscript. S Joniau contributed to data analysis and manuscript writing.

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Correspondence to Daimantas Milonas.

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Conflict of interest

The authors declare no conflict of interest.

Ethical approval

The study protocol was approved by the Regional Biomedical Research Ethics Committee (Protocol ID BE-2-27), and the trial was registered in the ClinicalTrials.gov database (NCT00780754). ‘All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.’

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All patients signed written informed consent before trial enrollment.

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Milonas, D., Auskalnis, S., Skulcius, G. et al. Dutasteride for the prevention of prostate cancer in men with high-grade prostatic intraepithelial neoplasia: results of a phase III randomized open-label 3-year trial. World J Urol 35, 721–728 (2017). https://doi.org/10.1007/s00345-016-1938-8

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  • DOI: https://doi.org/10.1007/s00345-016-1938-8

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