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[Significance of PSA-density: analysis in PSA gray zone cases]
1Department of Urology, Shinshu University School of Medicine.
Hinyokika Kiyo. Acta Urologica Japonica
|November 6, 2001
Summary
Digital rectal exam and prostate-specific antigen (PSA) density improve prostate cancer detection in the PSA gray zone. A PSA density cutoff of 0.22 offers 90% sensitivity for identifying cancer in men with PSA levels between 4-10 ng/ml.
Area of Science:
- Urology
- Oncology
- Medical Diagnostics
Background:
- Prostate-specific antigen (PSA) levels between 4-10 ng/ml represent a diagnostic challenge, often termed the "gray zone."
- Accurate detection of prostate cancer in this group is crucial to avoid unnecessary biopsies and missed diagnoses.
Purpose of the Study:
- To evaluate the diagnostic performance of digital rectal examination (DRE) and PSA density (PSAD) for detecting prostate cancer in patients within the PSA gray zone.
- To determine optimal cut-off values for PSAD to enhance cancer detection rates.
Main Methods:
- Retrospective analysis of 81 patients with PSA levels between 4-10 ng/ml who underwent sextant prostate biopsy.
- Assessment of sensitivity and specificity for DRE and various PSAD cut-off values.
Main Results:
- Sextant biopsy identified prostate cancer in 14.2% (14/81) of cases within the PSA gray zone.
- DRE demonstrated a sensitivity of 38.5% and specificity of 73.0%.
- A PSAD cut-off of 0.29 yielded 70% sensitivity and 70% specificity. A PSAD cut-off of 0.22 achieved 90% sensitivity.
Conclusions:
- PSA density is a valuable tool for improving prostate cancer detection in the PSA gray zone.
- A PSA density cut-off of 0.22 is recommended for maximizing sensitivity in identifying prostate cancer in this patient cohort.