Abstract
Immunohistochemical detection of prostate–specific antigen (PSA) is an aid in determining the prostatic origin of metastatic cells. However, small amounts of PSA have also been found in non–prostatic tissues and tumors, for example in some breast carcinomas, by highly sensitive immunofluorometric methods, but also by immunohistochemistry. Our aim was to evaluate the prevalence and prognostic value of histologically confirmed PSA immunoreactivity in breast carcinoma.
Sections of formalin–fixed, paraffin–embedded samples from 171 breast carcinomas were immunostained for PSA. The staining results were compared with the mitotic activity, tumor size, histological grade, steroid receptors and follow–up data. For analysis the material was divided into subgroups according to the patients' age (pre- and postmenopausal). PSA was found by immunohistochemistry in 54 (32) breast carcinomas. In survival analysis of the whole patient material PSA positivity did not show prognostic value. Among premenopausal patients concomitant estrogen receptor and PSA–negativity proved to be associated with high risk of breast cancer death (RR 6.2), also after adjustment for tumor size, histological grade, and axillary lymph node status. Among postmenopausal patients PSA positivity was associated with progesterone receptor positivity and high differentiation but not with age, nodal status, or mitotic activity. PSA can be detected by immunohistochemistry in a considerable number of breast carcinomas. PSA immunoreactivity alone does not seem to have any value as general prognosticator of breast carcinoma patients. However, concomitant absence of PSA and estrogen receptors was an indicator of unfavourable prognosis among premenopausal patients.
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Alanen, K.A., Kuopio, T., Collan, Y.U. et al. Immunohistochemical labelling for prostate–specific antigen in breast carcinomas. Breast Cancer Res Treat 56, 167–174 (1999). https://doi.org/10.1023/A:1006210627219
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DOI: https://doi.org/10.1023/A:1006210627219