Background
Positive surgical margins (PSMs) represent a poor prognostic factor at radical prostatectomy (RP). To investigate the impact of PSM, its length, the focality, and the PSM Gleason, on biochemical recurrence (BCR) in organâconfined RP patients.
Methods
Within a highâvolume center database, we identified patients who harbored organâconfined (pathologic stage T2 disease) prostate cancer (PCa) at RP (2010â2016). KaplanâMeier analyses and multivariable Cox regression models were used to test the effect of the PSM on the BCR risk.
Results
Overall, 8770 patients were identified. Of those, 6.6% (n = 579) harbored PSM. BCRâfree survival at 72 months after RP was 77.7% vs 89.0% for patients with vs without PSM (P < .001). BCRâfree survival rates at 72 months were 77.4% vs 73.6% (P = .1) for unifocal vs multifocal PSM, 77.2% vs 71.8% (P = .03) for Gleason pattern 3 vs â„4 at the margin and 88.4% vs 66.3% (P < .001) for <3 vs â„3 mm length of margin. In multivariable Cox models PSM was an independent predictor for BCR (hazard ratio [HR] = 2.40, P < .001). However, in subgroups with PSM, only â„3 mm PSM represented an independent predictor (HR = 1.93, P = .04), while focality and Gleason at the margin were no significant predictors.
Conclusion
PSM represents an independent predictor for BCR in organâconfined PCa at RP. Moreover, Gleason â„4 at the margin and â„3 mm PSM length were associated with worse BCRâfree survival. Closer surveillance of patients with organâconfined PCa at RP and PSM can help to identify those who qualify for early salvage radiotherapy.