Results of Use of Tissue-Engineered Autologous Oral Mucosa Graft for Urethral Reconstruction: A Multicenter, Prospective, Observational Trial

BACKGROUND Harvest of oral mucosa for urethroplasty due to urethral stricture is associated with donor-site-morbidity. We assessed functionality and safety of an authorized tissue-engineered oral mucosa graft (TEOMG) under routine practice in stricture recurrences of any etiology, location, length and severity (real-world data). METHODS 99 patients from eight centers with heterogenous urethroplasty experience levels were included in this prospective, non-interventional observational study. Primary and secondary outcomes were success rate (SR) and safety at 12 and 24months. FINDINGS All but one patient had ≥1, 77.1% (64 of 83)≥2 and 31.3% (26 of 83)≥4 previous surgical treatments. Pre- and postoperative mean±SD peak flow rate (Qmax) were 8.3±4.7mL/s (n=57) and 25.4±14.7mL/s (n=51). SR was 67.3% (95% CI 57.6-77.0) at 12 and 58.2% (95% CI 47.7-68.7) at 24months (conservative Kaplan Meier assessment). SR ranged between 85.7% and 0% in case of high and low surgical experience. Simple proportions of 12-month and 24-month SR for evaluable patients in all centers were 70.8% (46 of 65) and 76.9% (30 of 39). Except for one patient, no oral adverse event was reported. INTERPRETATIONS TEOMG is safe and efficient in urethroplasty.