DNA ploidy as a prognostic factor in muscle invasive transitional cell carcinoma of the bladder

Radical cystectomy represents the treatment of choice for muscle-infiltrative bladder carcinoma; however, about 50% of patients relapse and die from the disease. In the present study, the prognostic significance of the DNA ploidy in transitional cell carcinoma of the urinary bladder (TCCB) is analyzed. The study was carried out on 66 patients with TCCB who underwent radical cystectomy. DNA ploidy was determined by flow cytometry (FCM) on paraffin-embedded specimens, and the results were analyzed and correlated with the tumor malignancy grade and stage and the clinical course. Forty of the 66 tumors studied (63%) were aneuploid. Aneuploid status was correlated with higher tumor T stage (P < 0.001) and grade (P < 0.001). Median follow up was 68 months (range: 12-105). Median survival was significantly longer in patients with diploid tumors (> 60 vs 45 months, P < 0.001). All patients with diploid tumors were alive and free of bladder cancer during follow-up, in contrast to only 30% of patients with aneuploid tumors. DNA ploidy was an independent prognostic factor, as shown by multivariate analysis (P=0.006). All patients with pT >= 3b and diploid tumors were alive at the time of analysis as opposed to none with aneuploid tumors. The results of this study suggest that DNA ploidy can provide prognostic information on patients with muscle invasive carcinoma of the bladder and might represent a means of selection for postoperative management.