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[Parameters with possible influence in PSA adjusted for transition zone volume]
J Jara Rascón1, D Subirá Ríos, E Lledó Garcia
1Servicio de Urología, Hospital General Universitario Gregorio Marañtón, Madrid.
Actas Urologicas Espanolas
|July 15, 2005
Summary
Prostate-specific antigen adjusted to transition zone (PSA-TZ) is a useful prostate cancer marker. Its accuracy is not affected by age or digital rectal exam findings but requires adjustment for total prostate volume.
Area of Science:
- Urology
- Oncology
- Biomarker Research
Context:
- Prostate cancer diagnosis relies on prostate-specific antigen (PSA) levels.
- PSA adjusted for transition zone volume (PSA-TZ) may improve diagnostic accuracy.
- Factors influencing PSA-TZ require evaluation for optimal clinical application.
Purpose:
- To assess the impact of patient age, digital rectal examination (DRE) results, and total prostate volume on PSA-TZ values.
- To determine if PSA-TZ requires adjustments based on these clinical parameters for prostate cancer detection.
Summary:
- No significant correlation was found between age and PSA-TZ, nor were differences observed based on DRE results.
- Prostate cancer detection using PSA-TZ showed varying specificity (24-26%) for 95% sensitivity across normal and suspicious DRE groups.
- PSA-TZ values necessitate modification based on total prostate volume to maintain 95% sensitivity in cancer detection, with different thresholds for prostates >40 cc and ≤40 cc.
Impact:
- PSA-TZ utility as a prostate cancer predictor is independent of age and DRE findings.
- Adjusting PSA-TZ for total prostate volume is crucial for optimizing its sensitivity and accuracy in prostate cancer diagnosis.
