To survey hepatitis B virus (HBV) integration in liver cancer genomes, we conducted massively parallel sequencing of 81 HBV-positive and 7 HBV-negative hepatocellular carcinomas (HCCs) and adjacent normal tissues. We found that HBV integration is observed more frequently in the tumors (86.4%) than in adjacent liver tissues (30.7%). Copy-number variations (CNVs) were significantly increased at HBV breakpoint locations where chromosomal instability was likely induced. Approximately 40% of HBV breakpoints within the HBV genome were located within a 1,800-bp region where the viral enhancer, X gene and core gene are located. We also identified recurrent HBV integration events (in ≥4 HCCs) that were validated by RNA sequencing (RNA-seq) and Sanger sequencing at the known and putative cancer-related TERT, MLL4 and CCNE1 genes, which showed upregulated gene expression in tumor versus normal tissue. We also report evidence that suggests that the number of HBV integrations is associated with patient survival.
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We gratefully acknowledge Y.-K. Mak and the clinical team of the Division of Hepatobiliary and Pancreatic Surgery (HBP) at Queen Mary Hospital. This study was funded by the Asian Cancer Research Group (ACRG), a not-for-profit organization formed by Eli Lilly, Merck and Pfizer. We thank S. Friend and G. Jin for initiating the establishment of ACRG. We are grateful to former and present members of ACRG, especially K. Blanchard, Y. Turpaz, J. Sedgwick, G. Tucker-Kellogg, G. Gilliland, P. Shaw, N. Gibson and S. Adams.
The authors declare no competing financial interests.
Supplementary Figures 1–8, Supplementary Table 1 and Supplementary Note (PDF 1422 kb)
Summary of sequencing depth and coverage of 88 (TU/AN) pairs of HCC. (XLS 46 kb)
Characterization of 399 HBV integration breakpoints identified in HCC. (XLS 139 kb)
Validation result for the HBV integration sites. (XLS 40 kb)
Correlation analysis of HBV integration (cutoff = 1 to 6) with various clinic-pathological parameters of HCC patients (n = 83). (XLSX 13 kb)
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Sung, W., Zheng, H., Li, S. et al. Genome-wide survey of recurrent HBV integration in hepatocellular carcinoma. Nat Genet 44, 765–769 (2012) doi:10.1038/ng.2295
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