Expression of Zn-alpha 2-glycoprotein and PSP-94 in prostatic adenocarcinoma. An immunohistochemical study of 88 cases.
Zn-Alpha 2-Glycoprotein (Zn-Alpha 2-GP) and prostatic secretory protein of 94 amino-acids (PSP-94) were recently isolated from the human prostate. Their expression in benign and malignant well-differentiated and poorly differentiated components of 88 prostates with prostatic adenocarcinomas, and in 25 metastases, was evaluated using polyclonal antibodies developed against these antigens. Zn-Alpha 2-GP was present in benign hyperplastic glands in 91.1% of cases, but in only 40.7% (poorly differentiated component) to 48.5% (well-differentiated component) of prostatic adenocarcinomas, and in 8% of metastases. The expression of PSP-94 was present in 89.3% of benign hyperplastic glands, but in only 50% (well-differentiated adenocarcinoma component) to 57.3% (poorly differentiated component) of prostatic adenocarcinomas and 28% of metastases. The expression of these proteins by the tumor was unrelated to the initial stage and the tumor grade. Because of their low frequency in prostatic adenocarcinomas, especially in metastases, Zn-Alpha 2-GP and PSP-94 appear to have a limited diagnostic usefulness. Further studies are needed, however, to explore other clinical applications of these two new prostatic secretory proteins.
Gagnon
S
S
Department of Pathology, L'Hôtel-Dieu de Québec, Canada.
Têtu
B
B
Dubé
J Y
JY
Tremblay
R R
RR
D000230:Adenocarcinoma / Q000032:analysis* / Q000473:pathology; D000368:Aged; D000369:Aged, 80 and over; D002352:Carrier Proteins / Q000097:blood*; D006023:Glycoproteins / Q000032:analysis*; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D011467:Prostate / Q000032:analysis / Q000473:pathology; D011471:Prostatic Neoplasms / Q000032:analysis* / Q000473:pathology; D029584:Prostatic Secretory Proteins; D029589:Seminal Plasma Proteins; D000090203:Zn-Alpha-2-Glycoprotein
D002352:Carrier Proteins; D006023:Glycoproteins; D029584:Prostatic Secretory Proteins; D029589:Seminal Plasma Proteins; D000090203:Zn-Alpha-2-Glycoprotein; C028321:estramustine-binding protein