BLADDER CANCER: Validity of the 2004 system for grading Ta bladder cancer

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Abstract

Assessment of the clinical validity of the 2004 WHO grading system for bladder cancer staged pTa revealed three important aspects: the presence of substantial interobserver variability; that tumor grade is analogous to stage; and that the system has prognostic value (as low-grade tumors progress, but do so sporadically).

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