Evaluating Oncological Outcomes in Patients with Multiple PiRADS Lesion Treated with Robot-Assisted Radical...

Objective: To evaluate the early oncological outcomes of patients treated with robot-assisted radical prostatectomy for prostate cancer with multiple PIRADS lesions at baseline mpMRI in a tertiary referral center. Methods: Data of consecutive patients undergoing robot-assisted radical prostatectomy between 2020 and 2022 at a high-volume tertiary referral center were prospectively collected. mpMRI data was evaluated by two expert uro-radiologists at our center. All patients received an MRI-ultrasound fusion biopsy. Results: Overall, 286 patients with multiple PIRADS lesions treated with robot-assisted radical prostatectomy at a tertiary referral center were included. Unilateral and bilateral nerve-sparing were achieved in 63 (22.3%) and 124 (43.1%) patients, respectively. Median age was 69 years (IQR: 64-72), while median Charlson Comorbidity Index was 3 (IQR: 2-4). The presence of two PIRADS lesions was found in the 81.8% of cases, while 18.2% presented with three or more. Bilateral lesions were observed in 67.4% of cases. The dominant lesion was PIRADS 4 in 57.3% and PIRADS 5 in 32.3% of cases, with a median diameter of 12 mm (IQR: 10-17). Pathological upstaging to pT3 occurred in 61% of patients. Overall, 9.8% of cases exhibited positive surgical margins (PSMs), most of them single and limited in extent. Postoperative major complications were recorded in 6.3% of patients. At a median follow-up of 18 months (IQR: 6-29), biochemical recurrence (BCR) occurred in 8% of patients. Patients with PIRADS 5 lesions experienced shorter BCR-free survival compared to those with PIRADS 3-4. On multivariable Cox regression, PIRADS 5 independently predicted biochemical recurrence (HR: 2.52; 95% CI: 1.10-5.80; p = 0.029), after adjustment for age, number of lesions, and nerve-sparing status, with the performance of nerve-sparing not associated with an increased risk of recurrence, including in patients with multifocal disease. Conclusions: Nerve-Sparing Robot-Assisted Radical Prostatectomy in patients with multiple PIRADS lesions achieves encouraging short-term oncologic outcomes, with biochemical recurrence-free survival exceeding 84% at 3 years, despite high rates of multifocality and pathological upstaging.