Association Between Surgical Stress and Biochemical Recurrence After Robotic Radical Prostatectomy

BACKGROUND AND OBJECTIVES: This study was conducted to identify whether surgical stress during the peri-operative period of robot-assisted radical prostatectomy might affect biochemical recurrence in patients with positive surgical margins. METHODS: Participants in the present study were 324 consecutive patients with localized prostate cancer who underwent robot-assisted radical prostatectomy between February 2013 and June 2018. Positive surgical margins were diagnosed in 61 of them. Patients with positive surgical margins were divided into those with (n = 19) and those without (n = 42) biochemical recurrence. Lymph node dissection, estimated blood loss, inhalation anesthetic volume, and surgical duration were evaluated as indicators of surgical stress. White blood cell count, C-reactive protein, body temperature, and usage of analgesics were postoperatively evaluated as surrogate markers of surgical stress. The associations between factors, including patients' characteristics and pathological features, and biochemical recurrence were investigated. RESULTS: In univariate analyses, surgical duration (P = 0.004), D'Amico risk class (P = 0.002), Gleason score (P = 0.022) and the number of positive cores in prostate biopsy (P = 0.009) were statistically significantly associated with biochemical recurrence. In multivariate analyses, only surgical duration was significantly associated with biochemical recurrence (P = 0.042), at a cut-off value of surgical duration of 228.5 minutes. CONCLUSIONS: Prolonged surgical duration is associated with biochemical recurrence in patients with positive surgical margins. Thus, surgical duration should be limited as much as possible to reduce surgical stress, which might cause biochemical recurrence.