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Related Experiment Videos

Pitfalls in interpreting prostate specific antigen velocity

D Kadmon1, A D Weinberg, R H Williams

  • 1Matsunaga-Conte Prostate Cancer Research Center, Baylor College of Medicine and Methodist Hospital, Houston, Texas, USA.

The Journal of Urology
|May 1, 1996
PubMed
Summary
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Prostate specific antigen (PSA) levels fluctuate significantly in men without prostate cancer. Understanding this variability is crucial for accurately interpreting PSA velocity for cancer detection.

Area of Science:

  • Urology
  • Biomarkers
  • Prostate Cancer Research

Background:

  • Prostate specific antigen (PSA) velocity is a potential marker for prostate cancer detection.
  • Interpreting PSA velocity requires understanding confounding factors like serum PSA level variability.

Purpose of the Study:

  • To determine the variability of serum PSA levels in men without prostate cancer.
  • To assess the significance of PSA fluctuations for prostate cancer screening.

Main Methods:

  • Reviewed data from a prostate cancer screening program.
  • Analyzed inter-assay and individual variability of serum PSA over a 2-year follow-up in 265 men.
  • Established a 15% threshold for significant PSA changes.

Main Results:

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  • Average inter-assay coefficient of variation was 7.5%.
  • Serum PSA fluctuations occurred in 78% of men.
  • 12.5% had PSA increases >0.75 ng/ml/year; fluctuations increased with mean PSA.

Conclusions:

  • Inter-assay variability impacts PSA velocity interpretation.
  • Significant individual PSA fluctuations necessitate a minimum 2-year observation period for abnormal PSA velocity detection.