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. 1994 Sep;70(3):395–397. doi: 10.1038/bjc.1994.315

Loss of heterozygosity on the long arm of chromosome 11 in colorectal tumours.

C E Gustafson 1, J Young 1, B Leggett 1, J Searle 1, G Chenevix-Trench 1
PMCID: PMC2033367  PMID: 8080720

Abstract

We have examined a series of human colorectal adenomas, carcinomas and cell lines derived from human colorectal cancer for loss of heterozygosity (LOH) on chromosome 11q22-23 by polymerase chain reaction (PCR) amplification of a microsatellite polymorphism of the dopamine D2 receptor (DRD2) locus. LOH was demonstrated in 5/30 (16.7%) adenomas and 23/68 (33.8%) carcinomas. Only 2/20 (10%) cell lines showed homozygosity which could potentially be as a consequence of LOH. This moderate level of loss in the tumour samples was probably not an underestimation as a result of excessive stromal contamination because high rates (68-77%) have been detected in the same samples on chromosomes 17 and 18. In contrast to a previous report, LOH in carcinomas at 11q22-23 occurred at a lower frequency and was not associated with Dukes' stage, degree of differentiation, mucin production or the location of the cancer. However, a significant association was found between LOH on chromosome 11 and chromosome 14. Thus, inactivation of any putative tumour-suppressor gene at 11q22-23 by LOH is not a very common event in the development of colorectal tumours, but may be biologically significant if accompanied by chromosome 14 deletions.

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Selected References

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