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American Journal of Pathology, Vol 144, 1-6, Copyright © 1994 by American Society for Investigative Pathology
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M Chang, K Tsuchiya, RH Batchelor, PS Rabinovitch, BG Kulander, RC Haggitt and GC Burmer
Department of Pathology, University of Washington School of Medicine, Seattle.
Short tandem repeat polymorphism markers on the short arm of chromosome 8 were used to search for loss of heterozygosity (LOH) in colorectal carcinoma and dysplasia complicating ulcerative colitis, in prostatic carcinoma, and in malignant fibrous histiocytoma (MFH). Fifty percent of prostatic carcinomas (13/26), 44% of carcinomas or dysplasias arising in ulcerative colitis (7/16), and 30% (4/12) of MFH cases showed LOH for markers on 8p. Detailed mapping demonstrated variability in the size of the chromosomal region showing LOH; however, the data suggest a common 30-centimorgan region of LOH on chromosome 8p between the LPL locus and pter in colorectal and prostatic cancers. In addition, LOH was observed on 8p in both high-grade and low-grade dysplasia in ulcerative colitis, indicating that LOH on 8p may occur at an early stage of neoplastic development in this disorder. In contrast, MFH cases exhibited LOH for marker D8S87, which has been identified as being near the putative Werner's syndrome locus. These results suggest that a tumor suppressor gene, located on the distal portion of chromosome 8p, exists in common for prostatic and colorectal carcinomas, and a second tumor suppressor gene may exist linked to the Werner's syndrome locus.
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