The Effect of Surgical Experience on Perioperative and Oncological Outcomes After Robot-assisted Radical Cystectomy with Intracorporeal Urinary Diversion: Evidence from a Referral Centre with Extensive Experience in Robotic Surgery

Evidence on the learning curve for robot-assisted radical cystectomy (RARC) with intracorporeal urinary diversion (ICUD) is limited.To assess the effect of surgical experience (SE) on perioperative and intermediate-term oncological outcomes in a large contemporary cohort of RARC patients after accounting for the impact of intersurgeon variability.The study cohort included 164 patients treated with RARC and ICUD by two surgeons between 2004 and 2017 at a single European referral centre.For each patient, SE was defined as the total number of RARCs performed by each surgeon before the patient's operation. The relationship between SE and operative time (OT), lymph node yield (LNY), positive surgical margins (PSMs), Clavien-Dindo grade ≥2 30-d postoperative complication (CD≥2), and oncological outcomes (18-mo recurrence rate) was evaluated in multivariable linear and logistic regression models, clustering at a single-surgeon level.After adjusting for case mix, SE was associated with shorter OT (p= 0.003), lower probability of postoperative CD≥2 rates (p= 0.01), and lower 18-mo recurrence rates (p= 0.002). Conversely, SE did not predict lower PSM rates (p= 0.3) and higher LNY (p= 0.4). The relationship between SE and OT was nonlinear, with a plateau observed after 50 cases. Conversely, the relationship between SE and CD≥2 and 18-mo recurrence was linear without reaching a plateau after 88 procedures.SE affects perioperative and oncological outcomes after RARC with ICUD in a linear fashion, and its beneficial effect does not reach a plateau. Conversely, after 50 cases, no further improvement was observed for OT.Robot-assisted radical cystectomy with intracorporeal urinary diversion is a complex surgical procedure with a relatively long learning curve.