TP7.2.3 The effect of immediate versus early instillation of mitomycin C after transurethral resection of bladder cancer: Is timing everything?

Abstract

Abstract Introduction and Aims Almost three quarters of patients diagnosed with bladder cancer have non-muscle invasive disease. The European Association of Urology (EAU) guidelines recommend the use of intravesical instillation of Mitomycin C (MMC) to reduce the rate of recurrence. Methods A retrospective cohort analysis was carried out of all patients who underwent a TURBT between January 2016 and January 2019 in our Trust. A comparison of recurrence outcomes was investigated between patients who had immediate instillation of MMC (within 1 hours post-TURBT) versus early instillation (within 24 hours post-TURBT). Recurrence was assessed at 3 months cystoscopy and at 1 year follow-up. Results 201 patients were included. 100 underwent immediate MMC instillation (75% male, 25% female); 101 early instillation (72% male, 28% female). There was 11% recurrence (immediate) versus 13% (early) in instillation groups at 3 months. At first year, recurrence was seen in 12% (immediate) versus 14% (early) groups. Of these recurrences, there was an upstaging of tumour in 27% (immediate) versus 31% (early) at the 3 monthly follow-up and 25% (immediate) versus 28% (early) at the 1st year. The mean period of post-operative stay following initial TURBT was 0.8 days in the immediate versus 1.1 days in the early instillation groups. Conclusion Although no statistical differences were seen in this study, the results appear to favour immediate instillation of MMC after TURBT with respect to reduction in recurrence and upstaging rates. Post-operative length of stay in hospital was also shorter in patients who had an immediate MMC instillation.