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Related Experiment Videos

Immunohistochemical labelling for prostate specific antigen in non-prostatic tissues

K A Alanen1, T Kuopio, P J Koskinen

  • 1Department of Pathology, University of Turku, Finland.

Pathology, Research and Practice
|March 1, 1996
PubMed
Summary

Prostate specific antigen (PSA) is generally specific to prostate tissue, but can appear in some normal non-prostatic tissues and breast cancers. Relying solely on PSA immunolabeling for diagnosing metastatic prostate cancer is not definitive.

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Area of Science:

  • Oncology
  • Pathology
  • Biomarker Research

Background:

  • Prostate specific antigen (PSA) is a key immunohistochemical marker for identifying metastatic prostate cancer.
  • Expression of PSA can be variable, with some prostate cancers showing poor differentiation and others expressing PSA in non-prostatic tissues.

Purpose of the Study:

  • To investigate the prevalence of PSA immunoreactivity in normal non-prostatic tissues.
  • To assess PSA expression in breast carcinoma, including ductal and apocrine types.
  • To evaluate the reliability of PSA as a sole marker for prostatic origin.

Main Methods:

  • Immunohistochemistry using four commercial antibodies was performed on 34 normal human tissues and 22 breast carcinomas.
  • PSA concentrations were measured in tissue homogenates from prostate and nine non-prostatic tissues using a two-site immunoradiometric assay.

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Main Results:

  • Weak PSA immunoreactivity was observed in kidney, parotid gland, and pancreatic tissues.
  • Variable PSA immunoreactivity was detected in 20% of ductal and 28% of apocrine breast carcinomas.
  • No consistent PSA immunoreactivity was found in non-prostatic tissue homogenates via immunoradiometric assay.

Conclusions:

  • PSA is a highly specific marker for prostate tissue.
  • Certain normal non-prostatic tissues and breast cancers can express PSA.
  • PSA immunolabeling alone is insufficient for a definitive diagnosis of metastatic prostate cancer.