[Prognostic value of cytofluorometry in bladder tumors].

Bladder lavage fluid was examined using flow-cytometry (FCM) in 112 patients with transitional cell carcinoma seen over 30 months. FCM investigates the entire mucosa, furnishes indications as to the possible existence of dysplasia or carcinoma in situ, and thus provides for a more accurate evaluation of the evolutive potential of the "bladder disease". FCM consists in the automated assay of the DNA content of epithelial cells. The test is positive when "tumorous" diploid or aneuploid cells are demonstrated. The diagnostic sensitivity of FCM is comparable to that of cytologic diagnosis on bladder lavage specimens, but FCM has the additional advantage of detecting those patients at high risk for disease progression by measurement of the DNA index. Grade 1 and 2 tumors are diploid in 70% of patients, against only 14% for grade 3 tumors and carcinomas in situ. Follow up of 25 grade 2 patients and determination of the recurrence index clearly establishes the prognostic significance of the degree of tumorous ploidy. Furthermore, the effectiveness of endovesical chemotherapy can be monitored using FCM measurement of the aneuploidy index.