Clonality analysis of multiple hepatocellular carcinomas by loss of heterozygosity pattern determined by chromosomes 16q and 13q
Journal
Journal of Gastroenterology and Hepatology (Australia)
Journal Volume
20
Journal Issue
4
Pages
536-546
Date Issued
2005
Author(s)
Abstract
Background and Aim: Loss of heterozygosity (LOH) on chromosomes 16q and 13q, associated with tumor development, is frequently found in hepatocellular carcinoma (HCC). In light of this, an attempt was made to use the LOH pattern determined by microsatellite markers on 16q and 13q to discriminate clonality. Methods: In an effort to locate the LOH region more precisely and select the appropriate markers, LOH studies on 88 HCC using a panel of 35 microsatellite markers on 16q were carried out. Nine independent regions of frequent LOH were defined. In combination with a previous study of deletion mapping of 13q by the same authors, 12 markers on 16q and 13q were selected and polymerase chain reaction amplification, from microdissection-extracted DNA, was used to allelotype microsatellite polymorphism as an indication of clonality. Results: Two patterns of LOH were observed. In pattern A, in 8 of 16 (50%) patients, the LOH pattern of the first tumor was preserved in the second sample, with some tumors also showing additional LOH. In these patients, the original and second tumors are presumed to arise from the same original clone with or without progressive accumulation of LOH. In pattern B (8 of 16, 50%), LOH seen in the first tumor was not preserved in the second or recurrent tumors, as evidenced by retention of heterozygosity compared with the first tumor. Conclusion: The data suggest that the second tumor might have arisen from another independent clone. Moreover, this approach also provides a more sensitive and specific strategy to determine whether multiple or recurrent tumors are derived from the same or a different clone. ? 2005 Blackwell Publishing Asia Pty Ltd.
Other Subjects
article; chromosome 13q; chromosome 16q; chromosome analysis; clonal variation; disease course; DNA polymorphism; female; gene amplification; gene deletion; gene mapping; genetic analysis; heterozygosity loss; human; human tissue; laser capture microdissection; liver carcinogenesis; liver cell carcinoma; major clinical study; male; microsatellite marker; polymerase chain reaction; priority journal
Publisher
Blackwell Publishing
Type
journal article