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Inflamm Bowel Dis. 2019 Aug 2. pii: izz171. doi: 10.1093/ibd/izz171. [Epub ahead of print]

IBD-Associated Dysplastic Lesions Show More Chromosomal Instability Than Sporadic Adenomas.

Author information

1
Department of Gastroenterology and Hepatology, Amsterdam UMC, Academic Medical Centre, Amsterdam, the Netherlands.
2
Department of Pathology, Cancer Center Amsterdam, Amsterdam UMC, Vrije Universiteit, Amsterdam, the Netherlands.
3
Department of Pathology, The Netherlands Cancer Institute, Amsterdam, the Netherlands.
4
Department of Gastroenterology and Hepatology, Amsterdam Gastroenterology and Metabolism Research Institute, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands.

Abstract

BACKGROUND:

Patients with longstanding inflammatory bowel disease (IBD; ie, ulcerative colitis and Crohn's disease) have an increased risk of colorectal cancer (CRC). Due to ongoing inflammation, IBD-associated dysplastic lesions can develop. These lesions have an increased risk to progress to cancer compared with sporadic adenomas, which are also found in these patients. Differentiating between these 2 types of dysplasia remains challenging, both clinically and histologically, while treatment strategies may differ. Therefore, the aim of this study was to investigate molecular alterations associated with colorectal dysplasia to cancer progression in IBD and evaluate to what extent these alterations differ from sporadic adenomas.

METHODS:

DNA copy number aberrations and mutation analyses of 48 genes were performed by next-generation sequencing in 43 IBD-associated dysplastic lesions, 30 of which were dysplastic and 13 of which were cancers. Results were compared with existing DNA copy number and mutation data from 118 sporadic adenomas and 24 sporadic cancers.

RESULTS:

Inflammatory bowel disease-associated dysplastic lesions harbor patterns of DNA copy number aberrations comparable to carcinomas, which are rare in sporadic adenomas. TP53 mutation was the most frequent mutation observed in IBD-associated dysplastic lesions and in cancers. FBXW7 was mutated significantly more often in IBD-associated dysplastic lesions than in sporadic adenomas.

CONCLUSIONS:

Inflammatory bowel disease-associated dysplastic lesions show more DNA copy number aberrations than sporadic adenomas. TP53 and FBXW7 mutations appear to be involved in the development of IBD-associated dysplastic lesions and cancer. These findings indicate that IBD-associated dysplastic lesions are more genomically unstable, possibly reflecting a faster progression toward cancer.

KEYWORDS:

DNA copy number; IBD-associated dysplasia; colorectal cancer; inflammatory bowel disease; mutation

PMID:
31372648
DOI:
10.1093/ibd/izz171

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