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DNA Banding Patterns in Carcinoma of the Bladder

William H. Falor, MD, MS; Rose Marie Ward
JAMA. 1973;226(11):1322-1327. doi:10.1001/jama.1973.03230110018004.
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With the introduction in 1970 of DNA staining techniques productive of specific banding patterns in each chromosome, detailed chromosomal morphology became apparent, and precise karyotyping was a reality. To study the banding patterns of malignant tumors, six moderately well-differentiated transitional cell carcinomas of the bladder subjected to the direct squash procedure were stained by the acid-saline-Giemsa technique. Chromosomes A-2, B-4, and D-13 showed the most consistent patterns. Two marker chromosomes characterized the six tumors: marker l, a long submetacentric, was present in 66% of the karyotypes and marker II, resembling a B-4, was present in 28%. These markers, coupled with the subtetraploid mode of the six tumors, were unique when compared with well-differentiated and poorly differentiated bladder carcinomas. Potentially, DNA banding provides a more accurate method of classification, including assay of invasiveness, of malignant neoplasms of the bladder.


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