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Cytogenetic analysis of intestinal polyps in polyposis syndromes: comparison with sporadic colorectal adenomas.
Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland.
Cancer genetics and cytogenetics 1993;67(1):14-20.
Few cytogenetic studies of polyps from patients with polyposis syndromes have been reported. We studied 27 colonic adenomatous polyps from familial adenomatous polyposis (FAP), two polyps of the small bowel from Peutz-Jeghers syndrome (PJS), and four colorectal juvenile polyps from juvenile polyposis syndrome (JPS). The karyotypic results were compared with 32 sporadic colorectal adenomatous polyps. Nineteen colorectal adenomas had abnormal karyotypes; of these, five were from patients with FAP and 14 were sporadic adenomas. Numerical changes were the most frequent change (14 adenomas); additional copies of chromosome 7 (eight adenomas) and 13 (seven adenomas) occurred most often and were present in both FAP and sporadic adenomas. Only five adenomas, all sporadic, had structural chromosome abnormalities. Normal karyotypes were obtained from 32 adenomas, and chromosome counts but not karyotypes were obtained from eight polyps owing to poor chromosome morphology. The JPS and PJS polyps had normal karyotypes. These data indicate that adenomas from patients with FAP tend to have fewer structural abnormalities than sporadic adenomas and that numerical abnormalities are the most common chromosome abnormality in both FAP and sporadic polyps and suggest that the mechanism which causes loss of heterozygosity (LOH) in the adenoma to carcinoma sequence operates on a level below that of the whole chromosome.
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