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• W2086847777 abstract "Recent molecular studies have shown that there are differences in the prevalence and timing of certain molecular events between chronic ulcerative colitis (CUC)-associated dysplastic lesions and non-CUC-related sporadic adenomas. However, little is known regarding the molecular features of a specific subtype of CUC-related dysplasia-associated lesion or mass (DALM) that clinically, endoscopically, and pathologically resemble sporadic adenomas, and whether these lesions can be separated from non-CUC-related sporadic adenomas on the basis of their molecular genotype. Therefore, the purpose of this study was to evaluate loss of heterozygosity (LOH) of 3p, APC, and p16 in a specific group of CUC-associated adenoma-like DALMs and to compare the results of this tumor with those in a well-defined group of CUC-associated non-adenoma-like DALMs and non-CUC-associated sporadic adenomas. Polypectomy or resection specimens from 21 CUC patients with an adenoma-like DALM, 8 CUC patients with at least one nonadenoma-like DALM (12 lesions in total), and 23 non-CUC patients with a sporadic adenoma were evaluated for LOH of 3p, APC, and p16 by PCR analysis. The results were compared among the three different study groups and correlated with the clinical features of the patients and the pathology of their tumors. Chronic ulcerative colitis-associated adenoma-like DALMs showed LOH of 3p in five of 18 (28%) cases. This value was not significantly different from the 5% of non-CUC sporadic adenomas (p = 0.14) that were positive. However, 50% of CUC-associated non-adenoma-like DALMs were positive for LOH of 3p, and this value was significantly higher (p = 0.01) than the other groups. The frequency of LOH of APC did not differ significantly between the three patient groups (33%, 33%, and 43% in the three groups, respectively). Similar to the 3p results, CUC-associated adenoma-like DALMs and non-CUC-associated sporadic adenomas showed a similar low frequency of positivity for LOH of p16 (5% and 4%, respectively) in comparison to 56% of CUC-associated non-adenoma-like DALMs (p = 0.003). For all markers, no significant differences were detected in the CUC-associated adenoma-like DALM group between lesions that occurred within colitis compared with those that occurred in areas not involved by colitis. Chronic ulcerative colitis-associated non-adenoma-like DALMs have a different molecular genotype than CUC-related adenoma-like DALMs and non-CUC sporadic adenomas. Our data also suggests that the latter two groups of neoplasms may in fact represent a similar, if not identical, pathogenetic entity." @default.
• W2086847777 created "2016-06-24" @default.
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• W2086847777 date "2000-09-01" @default.
• W2086847777 modified "2023-10-09" @default.
• W2086847777 title "Genetic Alterations in Chronic Ulcerative Colitis-Associated Adenoma-Like DALMs Are Similar to Non-Colitic Sporadic Adenomas" @default.
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• W2086847777 doi "https://doi.org/10.1097/00000478-200009000-00003" @default.
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