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Related Experiment Videos

Prostate-specific antigen expression by various tumors

M Levesque1, H Hu, M D'Costa

  • 1Department of Clinical Biochemistry, Toronto Hospital, Ontario, Canada.

Journal of Clinical Laboratory Analysis
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

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Prostate-specific antigen (PSA) is found in various human tumors beyond the prostate, including breast, colon, ovarian, liver, and kidney. This discovery suggests a broader role for PSA in different cancer types.

Area of Science:

  • Oncology
  • Biochemistry

Background:

  • Prostate-specific antigen (PSA) is traditionally associated with the prostate.
  • Emerging evidence suggests PSA presence in other steroid hormone-stimulated epithelial tissues, including breast.
  • Our group previously detected PSA in breast tumors and normal breast tissue.

Purpose of the Study:

  • To investigate the presence of PSA in a diverse range of human tumors.
  • To quantify PSA immunoreactivity in tumor extracts using a sensitive assay.

Main Methods:

  • Utilized a highly sensitive immunofluorometric assay to quantify PSA.
  • Established a PSA-positivity cutoff of 0.005 ng per mg of protein.
  • Confirmed findings with a commercial PSA assay (IMx) and analyzed molecular weight via HPLC.

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Main Results:

  • PSA protein was detected in 23 out of 43 diverse tumors tested.
  • High concordance was observed between the immunofluorometric assay and the commercial IMx method.
  • Colon and parotid tumors showed PSA immunoreactivity exclusively at 33 KDa (free PSA).

Conclusions:

  • PSA is produced not only in breast tissue but also in colon, ovarian, liver, kidney, adrenal, and parotid tumors.
  • These findings expand the known tissue distribution of PSA.
  • The physiological function of PSA in these non-prostate tumors requires further investigation.