The randomized clinical study consists of two intervention arms. The control arm consists of a conventional follow-up based on regular monitoring for urinary bladder UCC recurrences by cystoscopy. In the test arm a proportion of the cystoscopies is replaced by microsatellite analysis on voided urine. Both arms will be stratified for clinical and pathological tumour parameters as well as for the mutation status of the prognostic FGFR3 gene mutation.