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[PSA in prostatic fluid]

K Lehmann1, F Simmler, O Schmucki

  • 1Urologische Klinik, Kantonsspital Luzern.

Der Urologe. Ausg. A
|May 1, 1994
PubMed
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Prostate-specific antigen (PSA) in prostatic fluid is not more specific for prostate cancer than serum PSA. Serum PSA levels were significantly higher in cancer patients, while prostatic fluid PSA showed no significant differences across conditions.

Area of Science:

  • Urology
  • Oncology
  • Biochemistry

Background:

  • Serum prostate-specific antigen (PSA) is a biomarker for prostatic diseases, but its specificity for prostate cancer is limited.
  • Prostate cancer is associated with a higher increase in PSA compared to benign prostatic hyperplasia (BPH) or prostatitis.

Purpose of the Study:

  • To evaluate if PSA levels in prostatic fluid are more specific for diagnosing prostate cancer than serum PSA.
  • To compare PSA levels in serum and prostatic fluid across patients with prostate cancer, prostatitis, and BPH.

Main Methods:

  • Blood and prostatic fluid samples were collected from 31 patients with prostatic diseases.
  • PSA levels were measured in serum and expressed prostatic fluid using the Pros-Check test.
  • Patients were categorized into prostatitis, prostate cancer, and BPH groups.

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Main Results:

  • Serum PSA was significantly higher in prostate cancer patients (148 +/- 208 micrograms/l) compared to prostatitis (5.6 +/- 5.0 micrograms/l) and BPH (6.9 +/- 6.8 micrograms/l) (P < 0.01).
  • No statistically significant differences in PSA levels were found in prostatic fluid among the groups (prostatitis: 14.0 +/- 25.7 x 10(6) micrograms/l, carcinoma: 7.6 +/- 9.7 x 10(6) micrograms/l, BPH: 14.0 +/- 14.6 x 10(6) micrograms/l).
  • Prostatic fluid collection failed in 22.6% of patients.

Conclusions:

  • Serum PSA is significantly elevated in prostate cancer patients compared to those with prostatitis or BPH.
  • PSA in expressed prostatic fluid does not offer greater specificity for prostate cancer diagnosis than serum PSA.
  • Serum PSA remains a more reliable indicator than prostatic fluid PSA for differentiating prostate cancer.