Abstract
Both Mitomycin C (MMC) and doxorubicin (Adriamycin) (ADM) prevent the recurrence of superficial papillary (Ta-T1) urinary bladder cancers and also reduce the rate of progression. MMC appears to be more effective than ADM in buffered instillations. The number of recurrent tumours (RI/m) and the number of recurrence times (RR) before prophylactic instillation were of significant prognostic importance but the prognostic value of the grade was questionable. The buffer solution, together with methyl prednisolone, reduced the incidence of chemical cystitis.