Reproducibility and Prognostic Value of WHO1973 and WHO2004 Grading Systems in TaT1 Urothelial Carcinoma of the Urinary Bladder

European treatment guidelines of TaT1 urinary bladder urothelial carcinomas depend highly on stage and WHO1973-grade but grading reproducibility is wanting. The newer WHO2004 grading system is still debated and both systems are currently used.To compare reproducibility and prognostic value (of stage progression) of the WHO1973 and WHO2004.One hundred and ninety-three primary urothelial carcinomas were reviewed. Follow-up data were retrieved from...