Volume 13, Issue 3 pp. 163-167
Research Article
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Accumulation of genetic changes during development and progression of hepatocellular carcinoma: Loss of heterozygosity on chromosome arm Ip occurs at an early stage of hepatocarcinogenesis

Tamobu Kuroki

Tamobu Kuroki

Department of Biochemistry, Cancer Institute, Tokyo, Japan

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Yoshiyuki Fujiwara

Yoshiyuki Fujiwara

Department of Biochemistry, Cancer Institute, Tokyo, Japan

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Eiju Tsuchiya

Eiju Tsuchiya

Department of Pathology, Cancer Institute, Tokyo, Japan

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Shouji Nakamori

Shouji Nakamori

Department of Surgery, The Center for Adult Disease, Osaka, Japan

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Shingi Imaoka

Shingi Imaoka

Department of Surgery, The Center for Adult Disease, Osaka, Japan

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Takashi Kanematw

Takashi Kanematw

The Second Department of Surgery, Nagasaki University School of Medicine, Nagasaki, Japan

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Yusuke Nakamura MD,PhD

Corresponding Author

Yusuke Nakamura MD,PhD

Department of Biochemistry, Cancer Institute, Tokyo, Japan

Laboratoy of Molecular Medicine, Institute of Medical Science, The University of Tokyo, 4-6-1 Shiroganedai, Minato-ku, Tokyo 108, JapanSearch for more papers by this author
First published: July 1995
Citations: 93

Abstract

To investigate cumulative genetic changes during development and progression of hepatocellular carcinoma (HCC), we examined DNAs isolated from I04 tumors for loss of heterozygosity (LOH) at I 3 loci on six chromosomal arms and for an increase of copy number (“multiplication”) of alleles on 8q, using polymorphic microsatellite markers. A comparison of genetic features with clinicopathological stages of these tumors revealed that LOH on I p had occurred in tumors at an early stage or with a well-differentiated histological phenotype (8/26 31 %) as well as in tumors at more advanced stages. Genetic alterations on chromosome arms 4q. 8p, 8q, I 3q, I6q, and I7p were more often observed in tumors of more advanced stages and poorer differentiation grades. When size was the criterion for comparison, LOH on I p was observed frequently even in tumors smaller than 2 cm (6/16; 38%), whereas allelic losses on 16q were detected frequently only in larger tumors. These results suggest that the putative tumor suppressor gene(s) assumed to be located on I p may be involved in an early step of carcinogenesis in liver tissue and that the other genetic alterations examined here may play important roles in progression of HCC. © 1995 Wiley-Liss, Inc.

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