Improved application of impulse cytophotometry for the diagnosis of urinary bladder carcinoma

Using pulse cytophotometry, almost quantitative separation of the leucocyte fraction from DNA histograms was possible by means of an anticoincidence discrimination device, This modified technique was employed for biparametric DNA/protein measurements of voided urine samples, bladder washings, and tumour tissues. The results show a high degree of correlation between these samples so that, for tumour diagnosis from DNA histograms, voided urine specimens can be used rather than bladder washings. The criteria for the bladder tumour diagnosis are derived from DNA measurements of 32 controls and 35 tumour patients. The diagnostic sensitivity of this method is 0.91 and the specificity 0.75.