Genetic Variant Linked to Development of Liver Cancer in Hepatitis C Virus Carriers

Tokyo, July 4, 2011 - (JCN Newswire) - A genome-wide study by researchers at the RIKEN Center for Genomic Medicine, Hiroshima University Hospital and Sapporo-Kosei General Hospital has identified a genetic variant associated with the development of liver cancer in chronic hepatitis C virus carriers. The findings are based on a study of 3,312 Japanese individuals and appear in the journal Nature Genetics.

Hepatocellular carcinoma (HCC), the most common type of liver cancer, is the third leading cancer-related cause of death and the seventh most common form of cancer worldwide. The hepatitis C virus (HVC) is the main risk factor for HCC in many western countries and in Japan, where of the more than 30,000 deaths each year from HCC, 70% involve HVC.

To identify risk factors connecting HVC and HCC, the research group conducted a genome-wide study on a group of 3,312 Japanese individuals carrying the hepatitis C virus. Analyzing a total of 467,538 genetic markers (called single nucleotide polymorphisms or SNPs) in a group of 212 HCV carriers with HCC and 765 HCV carriers without HCC, the group uncovered one SNP associated with HCC risk, located on a gene called DEPDC5. The association was confirmed in an independent replication study on a population of 2335 HVC carriers, 710 with HCC and 1625 without HCC.

The significance of the findings was further highlighted when the researchers adjusted their results for gender, age and platelet count, revealing that among Japanese individuals with chronic HVC infection, the DEPDC5 SNP roughly doubles the odds of developing HCC.

While deepening our understanding of the mechanisms triggering HCC, the discovery of the DEPDC5 SNP locus also provides a valuable target for new therapy techniques, promising progress in the ongoing battle to overcome one of the world's most deadly cancers.

Reference:

Daiki Miki, Hidenori Ochi, C Nelson Hayes, Hiromi Abe, Tadahiko Yoshima, Hiroshi Aikata, Kenji Ikeda, Hiromitsu Kumada, Joji Toyota, Takashi Morizono, Tatsuhiko Tsunoda, Michiaki Kubo, Yusuke Nakamura, Naoyuki Kamatani & Kazuaki Chayama. Variation in the DEPDC5 locus is associated with progression to hepatocellular carcinoma in chronic hepatitis C virus carriers. Nature Genetics, doi:10.1038/ng.876.

About RIKEN Institute

RIKEN, one of Japan's leading research institutes, conducts basic and applied experimental research in a wide range of science and technology fields including physics, chemistry, medical science, biology and engineering. Initially established as a private research foundation in Tokyo in 1917, RIKEN became an independent administrative institution in 2003. For more information, visit www.riken.jp/engn/index.html.

Contact:

Kazuaki Chayama
Laboratory for Digestive Diseases
RIKEN Center for Genomic Medicine (CGM),
Tel: +81-82-257-5955
Fax: +81-82-257-1559

Ms. Tomoko Ikawa (PI officer)
Global Relations Office
RIKEN
Tel: +81-48-462-1225
Fax: +81-48-463-3687
Email: koho@riken.jp

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