Abstract
Two secondary squamous cell carcinomas of the bladder (i.e., tumors that originated from primary transitional cell carcinomas) were examined cytogenetically. Both tumors showed complex karyotypes with many of the same aberrations that have formerly been described in transitional cell carcinomas. Monosomy 9, trisomy 7, and rearrangements of chromosomes 3, 8, 10, 13, and 17 were common to both tumors. Among other changes that have been implicated in bladder carcinogenesis, an isochromosome for 5p was seen in one tumor and loss of 11p material in the other. Our findings indicate that secondary squamous cell carcinomas of the bladder are karyotypically indistinguishable from advanced transitional cell carcinomas of the same organ. The putative genetic changes that steer the differentiation of the neoplastic epithelium in the direction of squamous cells thus remain unknown.
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