DNA copy number profiles of gastric cancer precursor lesions

Chromosomal instability (CIN) is the most prevalent type of genomic instability in gastric tumours, but its role in malignant transformation of the gastric mucosa is still obscure. In the present study, we set out to study whether two morphologically distinct categories of gastric cancer precursor l...

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Published in:BMC genomics 2007-10, Vol.8 (1), p.345-345, Article 345
Main Authors: Buffart, Tineke E, Carvalho, Beatriz, Mons, Thomas, Reis, Rui M, Moutinho, Cátia, Silva, Paula, van Grieken, Nicole C T, Vieth, Michael, Stolte, Manfred, van de Velde, Cornelis J H, Schrock, Evelin, Matthaei, Anja, Ylstra, Bauke, Carneiro, Fátima, Meijer, Gerrit A
Format: Article
Language:English
Subjects:
Chromosomes, Artificial, Bacterial
DNA, Neoplasm - genetics
Genetic aspects
Genomic Instability
Humans
Precancerous Conditions - genetics
Precancerous Conditions - pathology
Stomach cancer
Stomach Neoplasms - genetics
Stomach Neoplasms - pathology
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Summary:Chromosomal instability (CIN) is the most prevalent type of genomic instability in gastric tumours, but its role in malignant transformation of the gastric mucosa is still obscure. In the present study, we set out to study whether two morphologically distinct categories of gastric cancer precursor lesions, i.e. intestinal-type and pyloric gland adenomas, would carry different patterns of DNA copy number changes, possibly reflecting distinct genetic pathways of gastric carcinogenesis in these two adenoma types. Using a 5K BAC array CGH platform, we showed that the most common aberrations shared by the 11 intestinal-type and 10 pyloric gland adenomas were gains of chromosomes 9 (29%), 11q (29%) and 20 (33%), and losses of chromosomes 13q (48%), 6(48%), 5(43%) and 10 (33%). The most frequent aberrations in intestinal-type gastric adenoma were gains on 11q, 9q and 8, and losses on chromosomes 5q, 6, 10 and 13, whereas in pyloric gland gastric adenomas these were gains on chromosome 20 and losses on 5q and 6. However, no significant differences were observed between the two adenoma types. The results suggest that gains on chromosomes 8, 9q, 11q and 20, and losses on chromosomes 5q, 6, 10 and 13, likely represent early events in gastric carcinogenesis. The phenotypical entities, intestinal-type and pyloric gland adenomas, however, do not differ significantly (P = 0.8) at the level of DNA copy number changes.
ISSN:1471-2164
1471-2164
DOI:10.1186/1471-2164-8-345