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  • Oncogenomics
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Genomic profiling of gastric cancer predicts lymph node status and survival

Abstract

Gastric carcinogenesis is driven by an accumulation of genetic changes that to a large extent occur at the chromosomal level. We analysed the patterns of chromosomal instability in 35 gastric carcinomas and their clinical correlations. With microarray competitive genomic hybridization, genomewide chromosomal copy number changes can be studied with high resolution and sensitivity. A genomewide scanning array with 2275 BAC and P1 clones spotted in triplicate was used. This array provided an average resolution of 1.4 Mb across the genome. Patterns of chromosomal aberrations were analysed by hierarchical cluster analysis of the normalized log2 tumour to normal fluorescence ratios of all clones, and cluster membership was correlated to clinicopathological data including survival. Hierarchical cluster analysis revealed three groups with different genomic profiles that correlated significantly with lymph node status (P=0.02). Moreover, gastric cancer cases from cluster 3 showed a significantly better prognosis than those from clusters 1 and 2 (P=0.02). Genomic profiling of gastric adenocarcinomas based on microarray analysis of chromosomal copy number changes predicted lymph node status and survival. The possibility to discriminate between patients with a high risk of lymph node metastasis could clinically be helpful for selecting patients for extended lymph node resection.

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Abbreviations

CGH:

comparative genomic hybridisation

H&E:

haematoxylin & eosin

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Acknowledgements

We thank Nils Brown for printing the microarray slides. This work was supported by the University Stimulation Foundation of the VU University (USF).

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Correspondence to Gerrit A Meijer.

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Grant support: University Stimulation Fund

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Weiss, M., Kuipers, E., Postma, C. et al. Genomic profiling of gastric cancer predicts lymph node status and survival. Oncogene 22, 1872–1879 (2003). https://doi.org/10.1038/sj.onc.1206350

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