Initial treatment for bladder CIS is TURBT followed by intravesical immunotherapy with BCG. Valrubicin is approved by the FDA for the treatment of BCG-refractory bladder CIS in patients for whom immediate cystectomy would be associated with unacceptable morbidity or mortality. The recommended course of therapy is 6 doses of 800 mg each administered intravesically once a week. While the benefit risk profile of valrubicin has been established in several clinical trials, current data on effectiveness and tolerability when used in clinical practice are lacking. This protocol outlines a retrospective study to evaluate the effectiveness, safety and tolerability of intravesical valrubicin in the treatment of NMIBC in a clinical practice setting.