[Prognostic value of the chromosome pattern in tumors of the urinary bladder]

Cytodiagnostic and histopathological studies were made in 42 cases of epithelial urinary bladder tumours. The correlation was investigated between the modal chromosomal number, the frequency of the structural chromosomal aberrations and the degree of histologic malignancy (cellular anaplasy and invasion of the bladder wall). The proliferative rate was also determined of the analized tumours. In all the epithelial tumours that have been studied it was noted that the more malignant the tumour, the higher was the value of the modal chromosomal number, and the more frequent the chromosomal abnormalities. The proliferative rate of polyploid tumours was significantly higher as compared with that of the diploid ones. The presence of a polyploid mitotic population, as well as of structural chromosomal disturbances in a tumour with a low degree of malignancy, as demonstrated histologically, may have a prognostic significance.