Abstract
To disclose genetic mechanisms involved in development or progression of hepatocellular carcinoma (HCC), we used a genome-wide cDNA microarray consisting of 8,448 genes to compare gene-expression profiles among 12 liver-cirrhosis nodules (LCNs) and five specimens of HCC excised from a single patient and carefully prepared by laser-capture microdissection (LCM). The expression patterns enabled us to identify 72 genes that were frequently upregulated and 57 that were downregulated specifically in the LCN specimens as compared to the HCCs. We also documented upregulation of 31 genes and downregulation of seven others in both HCC and LCN tissues. Several types of intracellular kinase, including receptor-type kinase, were upregulated in LCNs. Expression patterns of HCCs and LCNs generally represented two genetically distinct groups when subjected to a hierarchical clustering analysis, although expression profiles of two of the LCNs resembled the HCC pattern. Analysis of allelic losses at microsatellite loci revealed that LCNs showed frequent loss of heterozygosity (LOH) (33%) in chromosomal regions 6q and 22q; over half of the LCNs had lost an allele for at least one of the 28 loci examined. The presence of early genetic changes among LCNs, with additional genetic changes occurring during formation of HCCs, suggests that hepatocellular carcinogenesis follows the multistep model established for colon cancers and that some LCNs may be precancerous lesions.
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Acknowledgements
The authors wish to thank Kyoko Shimizu, Mayumi Tanaka, and Naoko Tsuruta for secretarial assistance. This work was supported by special grants for Strategic Advanced Research on “Cancer” from the Ministry of Education, Science, Sports and Culture of Japan; and by a Research for the Future Program Grant of The Japan Society for the Promotion of Science.
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Nagai, H., Terada, Y., Tajiri, T. et al. Characterization of liver-cirrhosis nodules by analysis of gene-expression profiles and patterns of allelic loss. J Hum Genet 49, 246–255 (2004). https://doi.org/10.1007/s10038-004-0141-8
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DOI: https://doi.org/10.1007/s10038-004-0141-8