Chemoablation Or Bladder Resection With Adjuvant Chemotherapy in Recurrent Non-Muscle Invasive Bladder Cancer

Inclusion Criteria: * Tumour recurrence after previous urothelial tumour of Ta low-grade * Tumours smaller than 2 cm in diameter * Negative urine cytology (optional) * ≥18 years of age * Ability to understand and comprehend the provided written and oral information * Has provided written consent Exclusion Criteria: * Known history of invasive tumour of the bladder (T1+) * Known history of CIS of the bladder * Previous MMC or BCG-treatment except for single instillations following previous TURBTs * Known allergy or intolerance to MMC * Solid tumour with suspicions of invasion * Tumour in the bladder neck or urethra * Suspicion of CIS (positive cytology with high-grade neoplastic cells combined with suspicious flat lesions seen at cystoscopy) * Small bladder volume (less than 100 ml) or incontinence * Prior radiation therapy to the pelvic area, as radiation affects the bladder function and instillation therapy is a suboptimal treatment for this patient group * Acute cystitis * Pregnancy or breast-feeding * Averse to using secure contraception with regard to men with partners and premenopausal women