[Immunohistochemical study of monoclonal antibody against gamma-seminoprotein in the prostatic tissues. A significant correlation between the degree of staining and the histological grade of adenocarcinoma of the prostate].

The tissues consisted of adenocarcinoma of the prostate were examined by immunohistochemical study with monoclonal antibody (43-21-1-1) against gamma-seminoprotein (gamma Sm)2). The degree of staining regarding any correlation with the histological grade was evaluated. The prostatic tissues were obtained by transurethral resection or by fine needle biopsy from untreated 38 patients. The avidin-biotin peroxidase complex technique was used to stain on 3 microns-sections of 10% formalin fixed, paraffin embedded tissue. In addition, immunohistochemical staining with the commercialized antibodies to prostate-specific antigen (PSA; polyclonal, DAKO) and to prostatic acid phosphatase (PAP; polyclonal, DAKO) was done simultaneously for a comparative study. The degree of immunoperoxidase stain was classified into two categories, namely location and pattern, and was graded from 0 to 3, respectively. The product of the degree of location and the degree of pattern was noted as the total score. The mean of score was calculated in each histological grade. Then the means of total scores were compared and evaluated as having any statistical difference by Student's t test among 3 histological grades as well as among 3 primary antibodies used in this study. When the monoclonal antibody to gamma-Sm was used for immunoperoxidase staining, the means of total scores and the rates of negative reactions (% Negative) in 3 histological grades were 6.8 +/- 1.8 (M +/- SD) and 0% in well (N = 9), 4.4 +/- 2.4 and 14% in moderately (N = 22), and 1.8 +/- 2.3 and 54% in poorly differentiated lesions (N = 11), respectively. There were statistically significant differences (P < 0.05) among 3 histological grades.(ABSTRACT TRUNCATED AT 250 WORDS)