p16INK4A Hypermethylation Is Associated with Hepatitis Virus Infection, Age, and Gender in Hepatocellular Carcinoma
Open Access
- 15 November 2004
- journal article
- Published by American Association for Cancer Research (AACR) in Clinical Cancer Research
- Vol. 10 (22) , 7484-7489
- https://doi.org/10.1158/1078-0432.ccr-04-1715
Abstract
Purpose: The tumor suppressor gene p16INK4A is mainly inactivated by an epigenetic change involving promoter hypermethylation in hepatocarcinogenesis. The possible clinical impact of p16INK4A methylation and the potential risk factors for this epigenetic alteration have not been thoroughly investigated. Experimental Design: We studied the methylation status and mRNA and protein expression of p16INK4A in 50 hepatocellular carcinomas and corresponding nonneoplastic liver lesions using methylation-specific PCR, reverse transcription-PCR, and immunohistochemical techniques. Results: p16INK4A hypermethylation was observed in 58% (29 of 50) of the hepatocellular carcinomas and 16% (6 of 38) of the corresponding chronic hepatitis and cirrhosis tissue samples. p16INK4A methylation was significantly associated with mRNA and protein expression (P < 0.001 and P = 0.003, respectively). All of the p16INK4A-methylated tumors were positive for hepatitis B virus or hepatitis C virus markers, but none of the virus-negative tumors exhibited p16INK4A methylation (P = 0.006). The frequency of p16INK4A hypermethylation tended to be higher in hepatitis C virus-related tumors (23 of 32, 72%) than in hepatitis B virus-related tumors (6 of 13, 46%; P = 0.1). Aberrant methylation of p16INK4A was also related significantly to increasing age, female gender, and normal levels of serum PIVKA-II (P = 0.02, 0.04, and 0.04, respectively). No statistically significant difference in survival was observed between patients with p16INK4A hypermethylation and those without. Conclusions: Our observations suggest that p16INK4A hypermethylation may contribute to hepatocarcinogenesis from an early stage and that multiple risk factors, such as viral infections, age, and gender, may be associated with p16INK4A hypermethylation in hepatocarcinogenesis.Keywords
This publication has 27 references indexed in Scilit:
- Epstein-Barr Virus-Positive Gastric Carcinoma Demonstrates Frequent Aberrant Methylation of Multiple Genes and Constitutes CpG Island Methylator Phenotype-Positive Gastric CarcinomaThe American Journal of Pathology, 2002
- Detection of hypermethylation of the p16INK4A gene promoter in chronic hepatitis and cirrhosis associated with hepatitis B or C virusGut, 2001
- Expression of mRNA for DNA methyltransferases and methyl-CpG–binding proteins and DNA methylation status on CpG islands and pericentromeric satellite regions during human hepatocarcinogenesisHepatology, 2001
- Correlations of partial and extensive methylation at the p14ARF locus with reduced mRNA expression in colorectal cancer cell lines and clinicopathological features in primary tumorsCarcinogenesis: Integrative Cancer Research, 2000
- High frequency of p16INK4A gene alterations in hepatocellular carcinomaOncogene, 1999
- Germ-line mutations of the p16 INK4( MTS1 ) gene occur in a subset of patients with hepatocellular carcinomaHepatology, 1997
- Frequency of Mutation and Deletion of the Tumor Suppressor Gene Cdkn2a (Mts1/P16) in Hepatocellular Carcinoma From An Australian PopulationHepatology, 1997
- Methylation of the oestrogen receptor CpG island links ageing and neoplasia in human colonNature Genetics, 1994
- Deletions of the cyclin-dependent kinase-4 inhibitor gene in multiple human cancersNature, 1994
- A new regulatory motif in cell-cycle control causing specific inhibition of cyclin D/CDK4Nature, 1993