Purpose: To investigate the effect of repeated transurethral procedures under general anesthesia on overall mortality in patients with non-invasive bladder cancer.Materials and methods: All Danish residents with non-invasive papillary urothelial carcinoma or primary urothelial carcinoma in situ diagnosed between 1 January 2000 and 1 January 2011 were included and followed until death or 31 March 2017.