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. 1999 May 1;80(3-4):489–494. doi: 10.1038/sj.bjc.6690383

Evidence for two candidate tumour suppressor loci on chromosome 9q in transitional cell carcinoma (TCC) of the bladder but no homozygous deletions in bladder tumour cell lines

A A G van Tilborg, L E Groenfeld, T H van der Kwast, E C Zwarthoff
PMCID: PMC2362340  PMID: 10408858

Abstract

The most frequent genetic alterations in transitional cell carcinoma (TCC) of the bladder involve loss of heterozygosity (LOH) on chromosome 9p and 9q. The LOH on chromosome 9p most likely targets the CDKN2 locus, which is inactivated in about 50% of TCCs. Candidate genes that are the target for LOH on chromosome 9q have yet to be identified. To narrow the localization of one or more putative tumour suppressor genes on this chromosome that play a role in TCC of the bladder, we examined 59 tumours with a panel of microsatellite markers along the chromosome. LOH was observed in 26 (44%) tumours. We present evidence for two different loci on the long arm of chromosome 9 where potential tumour suppressor genes are expected. These loci are delineated by interstitial deletions in two bladder tumours. Our results confirm the results of others and contribute to a further reduction of the size of these regions, which we called TCC1 and TCC2. These regions were examined for homozygous deletions with EST and STS markers. No homozygous deletions were observed in 17 different bladder tumour cell lines. © 1999 Cancer Research Campaign

Keywords: bladder cancer, transitional cell carcinoma, chromosome 9, deletion mapping, tumour suppressor genes, loss of heterozygosity

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Selected References

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