Maximum Ki-67 staining in prostate cancer provides independent prognostic information after radical prostatectomy

Anticancer Res. Nov-Dec 2001;21(6A):4071-6.

Abstract

Background: We have evaluated the prognostic value of Ki-67 growth fraction after radical prostatectomy, especially focusing on intermediate grade carcinomas.

Materials and methods: 104 patients treated by radical prostatectomy for clinically localized prostate cancer were studied. The area of highest tumour grade was selected from the prostatectomy specimens and used for Ki-67 immunostaining The fraction of Ki-67 positive tumour nuclei in the area of most intense proliferation ("hot spot") was estimated, and related to biochemical failure.

Results: Ki-67 expression (median 6.7%, range 1.2-42.6%) was significantly associated with WHO histological grade. In univariate analysis of all 104 carcinomas, Ki-67 expression was associated with time to biochemical failure as were age, tumour dimension, WHO histological grade, pathological stage, positive surgical margins and pre-operative s-PSA. In multivariate Cox' analysis, Ki-67 expression, pathological stage and pre-operative s-PSA remained as independent predictors of time to biochemical failure. Ki-67 expression (HR 4.8, p < 0.001) was also found to be an independent predictor among moderately-differentiated carcinomas.

Conclusion: Estimates of Ki-67 growth fraction in areas of highest tumour grade may prove to be a useful prognostic biomarker after radical prostatectomy.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenocarcinoma / metabolism*
  • Adenocarcinoma / pathology
  • Adenocarcinoma / surgery
  • Disease-Free Survival
  • Humans
  • Ki-67 Antigen / biosynthesis*
  • Male
  • Middle Aged
  • Multivariate Analysis
  • Neoplasm Staging
  • Prostatectomy
  • Prostatic Neoplasms / metabolism*
  • Prostatic Neoplasms / pathology
  • Prostatic Neoplasms / surgery
  • Staining and Labeling / methods

Substances

  • Ki-67 Antigen