Expressão do colágeno I, III e metaloproteinase nos diferentes graus de Gleason e estadio patológico do câncer prostático

Abstract

Purpose: The aim of this paper was to evaluate if the expression of metalloproteinase, collagen I and III could be related with Gleason score, preoperative PSA and pathological stage. Materials and Methods: Our study group included radical prostatectomy specimens of 33 patients with prostatic adenocarcinoma who underwent surgery in the period from 2001 to 2009. Patients were divided into 3 groups: Gleason score=6 (13 patients), Gleason score=7 (10 patients), Gleason score &#8805;8 (10 patients). Benign prostatic tissues adjacent to the cancer area in the different Gleason grades were used as a control group. The adenocarcinoma and benign areas were selected from the tissues under microscope analysis and further processed for collagen I and III gene analysis by Real Time PCR. Ten deparaffined sections of each group were used to evaluate collagen I, III and metalloproteinase immunoexpression. The results were related with Gleason score, preoperative PSA and pathological stage. Results: Despite the significant difference in both collagen I and III gene expression between benign and tumor areas in the prostate samples from Gleason score=6 (collagen I=0.4±0.2 vs 5±2.4,p<0.05; collagen III= 0.2±0.06 vs 0.7±0.1,p<0.05) and Gleason score&#8805;8 (collagen I= 8±3.4 vs 1.4±0.8,p<0.05; collagen III= 1.8±0.5 vs 0.6±0.1,p<0.05), there was no correlation with Gleason score, preoperative PSA or pathological stage. There was a positive correlation between metalloproteinase expression and Gleason score (r2=0.47). Conclusions: The positive correlation between metalloproteinase expression and Gleason score suggests that metalloproteinase could be a promissing factor to improve Gleason score. Its expression and regulation do not seem to be related with collagen degradation.