Morphological analysis of the effects of intraoperative transrectal compression of the prostate during high-intensity focused ultrasound for localized prostate cancer - Abstract

OBJECTIVES: To evaluate the effects of transrectal compression of the prostate for intra-operative prostatic swelling and intraprostatic point shift during high-intensity focused ultrasound treatment of localized prostate cancer.

METHODS: Patients treated with whole-gland high-intensity focused ultrasound as primary monotherapy for localized prostate cancer were enrolled in the study. Using the standard and compression method, the volumes of degassed water in the balloon covering the high-intensity focused ultrasound probe were 50 mL and 80-160 mL, respectively. To identify prostatic swelling and shift during high-intensity focused ultrasound and the volume occupied by the non-enhanced area, three-dimensional prostate models were reconstructed using ultrasound and contrast-enhanced magnetic resonance imaging.

RESULTS: In comparison with the standard (n = 40) and compression (n = 48) methods, intraoperative increase in the prostate volume (21% vs 5.3%; P = 0.044), intraprostatic point shift (4 mm vs 2 mm, P = 0.040 in the transition zone; 3 mm vs 0 mm; P = 0.001 in the peripheral zone) and the volume occupied by the non-enhanced area (89% vs 96%; P = 0.001) were significantly suppressed. The biochemical disease-free survival rate in patients treated using the compression method was significantly improved relative to the standard method (92.6% vs 76.5%; P = 0.038). Regarding complications, there was no significant difference in the rate of urethral stricture (P = 0.9), urinary tract infection (P = 0.9), incontinence (P = 0.3), erectile dysfunction (P = 0.9) or recto-urethral fistula between the patients treated using the standard and compression methods.

CONCLUSIONS: Intraoperative transrectal compression suppresses intraoperative increase in the prostate volume and intraprostatic point shift during high-intensity focused ultrasound, having the potential to achieve precise whole-gland and lesion-targeted focal therapy.

Written by:
Shoji S, Hashimoto A, Nakamoto M, Fukuda N, Fujikawa H, Endo K, Tomonaga T, Nakano M, Terachi T, Uchida T.   Are you the author?
Department of Urology, Tokai University Hachioji Hospital, Hachioji, Tokyo, Japan.

Reference: Int J Urol. 2015 Mar 23. Epub ahead of print.
doi: 10.1111/iju.12747


PubMed Abstract
PMID: 25808497

Beyond the Abstract

UroToday.com Prostate Cancer Section

E-Newsletters

Newsletter subscription

Free Daily and Weekly newsletters offered by content of interest

The fields of GU Oncology and Urology are rapidly advancing. Sign up today for articles, videos, conference highlights and abstracts from peer-review publications by disease and condition delivered to your inbox and read on the go.

Subscribe