Abstract
Indices of mitotic potential may improve prognostic discrimination in patients with malignant disease. Ki-67 is a monoclonal antibody directed against an unknown proliferation antigen which has been shown to be a measure of mitotic potential. Sixty-four benign and eighty malignant prostatic biopsies were stained with the Ki-67 antibody. Nuclear and cytoplasmic staining was identified in benign and malignant biopsies using immunoalkaline phosphatase and immunoperoxidase staining reactions. Nuclear staining was identified in 14 benign and 44 malignant biopsies. Nuclear staining for Ki-67 was seen in 36% of biopsies with Gleason histological score (GHS) 2-4, 71% with GHS 5-7 and 62% with GHS 8-10. Nuclear staining was associated with advanced local disease stage, but not with metastatic disease stage. Clinical follow-up is required to establish the value of Ki-67 immunostaining as a prognostic determinant in prostatic cancer.
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