[Value of real-time elastography to guide the systematic prostate biopsy in men with normal digital rectal exam]

Abstract

The aim of this study was to evaluate whether real-time elastography-guided biopsy in comparison to grey-scale ultrasound improves prostate cancer detection in patients with an unremarkable digital rectal exam.A total of 231 patients suspicious for prostate cancer were prospectively randomised to transrectal real-time elastography- (126) or grey-scale ultrasound (105)-guided biopsy. The peripheral zone was divided into 6 sectors from base, mid-gland to apex. Lesions with reduced elasticity during real-time elastography and hypoechoic areas during grey-scale ultrasound were defined as suspicious for prostate cancer. Prostate biopsy was guided by real-time elastography (RTE) or grey-scale ultrasound (GSU) using a systematic 10-core approach. Suspicious lesions on RTE or GSU in the corresponding randomised group were targeted within each sector. Accuracy of cancer prediction and histopathological cancer detection rates were evaluated and compared between the 2 imaging modalitiesBaseline characteristics of patients undergoing real-time elastography and grey-scale ultrasound, including age, prostate-specific antigen and prostate volume were not significantly different statistically (p>0.05). Overall, prostate cancer was detected in 76 of 231 cases (32.9%). The cancer detection rate was significantly higher (p=0.007) in patients who underwent a biopsy using real-time elastography (40.5%) compared to the grey-scale-guided group of men (23.8%). Sensitivity and specificity to detect prostate cancer in 1 386 prostate sectors was 53.5% and 70.5% for real-time elastography vs. 11.7% and 93.7% for grey-scale ultrasound, respectively.Compared to conventional grey-scale ultrasound, accuracy to detect prostate cancer using a systematic 10-core biopsy approach was significantly improved under the guidance of real-time elastography.