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[The value of prostatic biopsy in tumor mapping]
L Salomon1, M Colombel, J J Patard
1Service d'Urologie, CHU Henri Mondor, Créteil, France.
Summary
Prostatic biopsy site is a prognostic factor, but negative results don't rule out tumors. Median biopsies are more accurate and less affected by prostate size than sextant biopsies for predicting cancer before surgery.
Area of Science:
- Urology
- Oncology
- Pathology
Background:
- Prostatic biopsies are crucial for diagnosing and staging prostate cancer.
- Biopsy site is considered a prognostic factor in localized prostate cancer.
- Accurate prognostic information is vital for treatment decisions, including radical prostatectomy.
Purpose of the Study:
- To evaluate the prognostic value of positive prostatic biopsy sites compared to the actual tumor location after radical prostatectomy.
- To determine how the accuracy of biopsy site prediction can be improved.
Main Methods:
- A retrospective analysis of 166 patients undergoing radical prostatectomy for localized prostate cancer.
- Systematic ultrasound-guided transrectal sextant biopsies (6) and supplementary median biopsies (3) were performed.
- The location of positive biopsies was compared with the histopathological location of the tumor.
Main Results:
- Sextant biopsies showed a specificity of 81.5% and a sensitivity of 39.4% for detecting tumors.
- Median biopsies demonstrated higher accuracy with 70.3% sensitivity and 91.6% specificity.
- Prostate weight influenced sextant biopsy results, impacting positive predictive value (PPV) and negative predictive value (NPV).
Conclusions:
- Negative sextant biopsies do not exclude tumor presence and are unreliable prognostic indicators before radical prostatectomy.
- Prostate weight must be considered when interpreting negative biopsy results.
- Median biopsies offer superior accuracy and are less affected by prostate size, improving prognostic assessment.