Do repeated transurethral procedures under general anesthesia influence mortality in patients with non-invasive urothelial bladder cancer? A Danish national cohort study.

To investigate the effect of repeated transurethral procedures under general anesthesia on overall mortality in patients with non-invasive bladder cancer. All Danish residents with non-invasive papillary urothelial carcinoma or primary urothelial carcinoma diagnosed between 1 January 2000 and 1 January 2011 were included and followed until death or 31 March 2017. All transurethral procedures under general anesthesia, intravesical instillation therapy, recurrences and progression to invasive disease or cystectomy were recorded during follow-up.