A phase 2 pilot study of water irrigation after transurethral resection of bladder tumor (WATIP) demonstrating safety, feasibility and activity.

Water irrigation during and after TURBT is feasible and safe. Prospective assessment of its effect on NMIBC recurrence compared to post-TURBT intravesical chemotherapy is needed before recommending its use in routine clinical practice. Trial registration ANZCTR registration ID ACTRN12619000517178 on 1 April 2019.