Histoprognostic evaluation of papillary bladder tumors

A total of 799 cases of papillary bladder tumors were reviewed using both Franksson and Koss classifications. We report the results of a comparative analysis of the two classifications. No correlation between the histologic gradings in the two classifications emerges, especially regarding papilloma (Franksson, 39.3 per cent; Koss, 2.3 per cent). In both classifications recurrences are more frequent as the degree of malignancy increases, although recurrence cannot be excluded even in the lowest grades. As a result of our study, it appears that cellular anaplasia rather than invasion is a better criterion for reliable histoprognostic evaluation of papillary bladder tumors.