Utility of tissue microarrays MIB-1 for profiling prognostic biomarkers in clinically localized prostate cancer

INTRODUCTION AND OBJECTIVE: To analyze the immuno-histochemical expression of MIB-1 marker as a prognostic factor in patients with localized prostate neoplasia. METHODS: Analysis of 100 cases of patients with localized prostate neoplasia who underwent curative surgery from January 2000 to December 2006. The customary histological preparation was carried out, followed by immunohistochemical reaction to detect MIB-1 protein accumulation and statistical analysis. RESULTS: There was a larger proportion of negative expression for MIB-1 marker (63.0%, p < 0.0001). Patients with positive expression (MIB-1 positive) had higher PSA (PSA > 10 ng/dl) (p = 0.010), higher Gleason score (> 7) (p = 0.0003) and pathological stage pT2c (p = 0.001). In the comparison of variables, it was noticed that patients with positive expression had a higher mean PSA (p = 0.031), higher Gleason score (p < 0.0001), longer follow-up (p = 0.037), larger area of vascular proliferation (p < 0.0001) and higher proportion of tumor in relation to normal area (p = 0.012). CONCLUSION: MIB-1 proved to be a prognostic factor comparable to PSA, Gleason and staging.