|Year : 2011 | Volume
| Issue : 2 | Page : 299-300
Contrast-enhanced color Doppler-targeted prostate biopsy: An innovative method to improve an accuracy of a transrectal biopsy in patients with suspected cancer prostate
Rohit Kathpalia, Dharamveer Singh, Apul Goel
Department of Urology, CSM Medical University (Upgraded King George's Medical College), Lucknow, Uttar Pradesh, India
|Date of Web Publication||8-Jul-2011|
Department of Urology, CSM Medical University (Upgraded King George's Medical College), Lucknow, Uttar Pradesh
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Kathpalia R, Singh D, Goel A. Contrast-enhanced color Doppler-targeted prostate biopsy: An innovative method to improve an accuracy of a transrectal biopsy in patients with suspected cancer prostate. Indian J Urol 2011;27:299-300
|How to cite this URL:|
Kathpalia R, Singh D, Goel A. Contrast-enhanced color Doppler-targeted prostate biopsy: An innovative method to improve an accuracy of a transrectal biopsy in patients with suspected cancer prostate. Indian J Urol [serial online] 2011 [cited 2020 May 26];27:299-300. Available from: http://www.indianjurol.com/text.asp?2011/27/2/299/82867
Mitterberger M, Aigner F, Pinggera GM, Steiner E, Rehder P, Ulmer H,et al. Contrast-enhanced colour Doppler-targeted prostate biopsy: Correlation of a subjective blood-flow rating scale with the histopathological outcome of the biopsy. BJU Int 2010;106:1315-8.
| Summary|| |
Prostate cancer is among the major medical problems being faced by the male population. The main diagnostic tools used to seek evidence of prostate cancer include a digital rectal examination (DRE); the serum level of prostate specific antigen (PSA), and transrectal ultrasound (TRUS)-guided biopsies. The final diagnosis depends on the presence of adenocarcinoma in prostate biopsy cores.  Currently; at least 10 biopsy cores are recommended for routine use. However, diagnosing prostate cancer by above methods is far from optimal.  Furthermore, a significant number of prostate cancers are also found in patients with low serum PSA values.  Therefore, the search for improved diagnostic techniques is a necessity.
Microbubble contrast agents enhance the ultrasonographic visualization of the microvasculature associated with prostate cancer. These agents increase the echogenicity of the intravascular space on grey-scale imaging and provide a dramatic visible increase in the Doppler signal. 
The present study included 760 patients from a prostate cancer screening study, with a PSA level of ≥ 1.25 ng/mL and a free-to-total PSA ratio of < 18%. Contrast-enhanced color Doppler (CECD) TRUS-guided biopsies with five cores were taken transrectally only from hypervascular areas of the peripheral zone during administration of sulfur hexafluoride. Each biopsy core was reviewed by a pathologist and reported as cancer with an assigned Gleason score, or as prostatic intraepithelial neoplasia (PIN), inflammation or benign prostatic tissue. For image interpretation, a 5-point subjective rating score was assigned for each biopsy site on each imaging sequence, as follow:
- Score 1---benign, minimal enhancement (capsular and periurethral flow only);
- Score 2---probably benign, mild enhancement (symmetric radial flow from capsular branches);
- Score 3---indeterminate, mildly increased enhancement (asymmetric/increased flow in prostate);
- Score 4---probably malignant, moderately increased enhancement (asymmetric/ increased flow in prostate);
- Score 5---malignant, substantially increased enhancement (asymmetric/increased flow in prostate).
Interpreting the results, it was found that as the score increases the chance of malignancy in the biopsy also increased. All patients with score 5 had a positive biopsy for malignancy. There was a statistically significant correlation (r = 0.751, P < 0.01) comparing the blood-flow rating score with the findings on histopathology, showing that the subjective blood-flow rating score was strongly correlated to the findings on histopathology.
| Comments|| |
Studies have shown that there is a clear association of increased microvessel density with the presence of carcinoma, metastases, stage of disease, and disease-specific survival. The microvessels which proliferate in prostate cancer are below the resolution of conventional TRUS; hence, microbubble ultrasound contrast agents represent one approach to detect these microvessels. Recently developed ultrasound contrast agents have intravascular residence times of several minutes and can be used for parenchymal organ enhancement.
This study showed that the subjective CECD blood-flow rating score correlated strongly with the histopathological outcome. If there was an asymmetrical substantially increased enhancement of the prostate during CECD TRUS, the probability that the biopsy showed prostate cancer was very high. If there was a capsular and periurethral flow with minimal enhancement on CECD TRUS, the pathology probably showed benign tissue. Moreover, the sensitivity of diagnosing prostate cancer was increased, the overall detection rate was improved, and fewer biopsies were needed to obtain the same detection rate as a conventional prostate biopsy.
Thus, CECD TRUS is an innovative method of improving the accuracy of prostate biopsies, increasing its positive predictive value, and reducing the number of unnecessary biopsies. One of the limitations of the present study was that blood-flow rating was subjective and there was no data on inter- and intra-observer variability. However, this can be overcome by objective measurement, e.g. color pixel counting that could further improve the diagnostic accuracy of CECD TRUS in future.
| References|| |
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