The World Health Organization/International Society of Urological Pathology consensus classification of urothelial (transitional cell) neoplasms of the urinary bladder. Bladder Consensus Conference Committee.

This WHO/ISUP system is an attempt to develop as broad a consensus as possible in the classification of urothelial neoplasms, building upon earlier works and classification systems. It is meant to serve as a springboard for future studies that will help refine this classification, thus enabling us to provide better correlation of these lesions with their biologic behavior using uniform terminology.