Abstract
To investigate the prognostic significance of ribonucleotide reductase small subunit M2 (RRM2) in low- and intermediate-risk prostate cancer (PCa). A retrospective outcome study was conducted on 164 eligible PCa samples from the City of Hope (n = 90) and the Taipei Medical University (n = 74). The RRM2 protein levels were detected by immunohistochemistry. Biochemical recurrence was assessed using Kaplan-Meier and Cox proportional hazard analyses. Cell invasion assays, Ras/Raf, and matrix metallopeptidase 9 activities were determined to evaluate the role of RRM2 on invasiveness of PCa. Expression of RRM2 was significantly increased in patients with higher Gleason score, who had advanced T stage, and who were margin/capsule positive (P<0.05). Analysis revealed that the expression of RRM2 positively associated with biochemical recurrence of PCa in the City of Hope set (hazard ratio = 5.26; 95% CI 1.50-24.71) and the Taipei Medical University set (hazard ratio = 2.55; 95% CI 1.30-9.22). In stratification analysis, RRM2 was significantly correlated with poor outcome in patients with lower-risk PCa, including those with Gleason score 4 to 7, margin(-), capsule(-), and stage T1-T2. In patients with Gleason score 4 to 7, the risk of re...Continue Reading
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