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Department of Medicine, Gastroenterology Division, University of Maryland School of Medicine and Baltimore Veterans Affairs Hospital, Baltimore, Maryland 21201 [H. S., L. T., J. Y., H-Y. J., J. B., G. M. G., J. M. A., S. J. M.] and Department of Pathology, The Mount Sinai School of Medicine of the City University of New York, New York, New York [M. H., G. M. G., N. H.]
Microsatellites are short nucleotide repeat sequences present throughout the human genome. Alterations of microsatellites, comprising extra or missing copies of these sequences, have been termed microsatellite instability. This abnormality occurs in sporadic and hereditary adenocarcinomas of the proximal colon, as well as in many other tumor types. We determined whether microsatellite instability occurred in ulcerative colitis-associated cancers or precancerous dysplasias. Sixty-three patients were evaluated, consisting of 188 samples of genomic DNA (63 normal controls, 68 cancers, 52 dysplasias, and 5 adjacent tissues) at loci D2S119, D2S123, D2S147, D10S197, and D11S904. Multiplex polymerase chain reaction was performed using one radiolabeled nucleotide, and the products were electrophoresed on denaturing polyacrylamide gels. Seventeen of the 63 patients (27%) possessed lesions showing instability at 1 or more loci. Fourteen of 68 tumor samples (21%) and ten of 52 dysplasias (19%) displayed instability. There was no tendency for a greater number of loci to manifest instability in more advanced lesions. Neither anatomic location nor loss of heterozygosity at the p53 locus were associated with microsatellite instability by 2-way table analysis. These data support a role for defective DNA repair in the generation of a subset of both early and advanced ulcerative colitis-associated colorectal neoplastic lesions.
1 Supported by NIH Grant R01 DK47717 and the Crohn's and Colitis Foundation of America.
2 To whom requests for reprints should be addressed, at the University of Maryland N3W62, 22 South Greene Street, Baltimore, MD 21201.
Received 6/23/94. Accepted 8/ 3/94.
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