Abstract
Objectives: To evaluate the influence of prostate volume on the prostate-specific antigen (PSA) level adjusted for the transition zone volume (PSAT) and free-to-total PSA ratio (f/tPSA) in detecting prostate cancer in men with intermediate PSA levels of 4.1-10.0 ng/mL. Patients and methods: From March 1997 to June 1999, the f/tPSA and PSAT were measured in 105 patients who underwent ultrasound-guided systemic biopsies and had a PSA level of 4.1-10.0 ng/mL, with an apparently normal prostate on a digital rectal examination. The PSAT and f/tPSA were evaluated in all patients and in subgroups of patients with small (<40 mL) or large (≥40 mL) prostates, using receiver operating characteristic (ROC) curves. Results: Total prostate volume was highly correlated with transition zone volume in all patients and in both subgroups (P<0.001). In all 105 patients, PSAT had a sensitivity of 82% and its use would have avoided the largest number of unnecessary biopsies (87% specificity) at a threshold value of 0.35 ng. In men with small prostates f/tPSA and PSAT had a high sensitivity and specificity, at threshold values of 0.12 and 0.35 ng, respectively. In large prostates the PSAT was superior to f/tPSA in detecting prostate cancer. Conclusions: These results suggest that both f/tPSA and PSAT are useful in detecting prostate cancer in men with small prostates, while PSAT is superior to f/tPSA in detecting prostate cancer in men with large prostates.
Original language | English |
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Pages (from-to) | 670-674 |
Number of pages | 5 |
Journal | BJU International |
Volume | 86 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2000 |
Keywords
- Biopsy
- Detection
- Free PSA
- PSA
- PSAT
- Prostate cancer
- Prostate volume
ASJC Scopus subject areas
- Urology