Abstract
Background
Hepatitis B virus (HBV) infection is reported to be associated with an increased risk of pancreatic cancer (PaC), but it remains controversial whether this is a causal relationship. In addition, it is unclear whether the status of HBV infection also affects PaC risk. Therefore, we conducted a meta-analysis to more closely examine the association between HBV infection and PaC.
Method
The studies included in the meta-analysis were identified and retrieved from PubMed and several other databases. The literature search was conducted up until August 2012. We adopted the Cochrane Collaboration’s RevMan 5.1 in a combined analysis of pooled relative risk (RR) with their corresponding 95 % confidence intervals (CIs) using a random-effects and a fixed-effects model.
Results
Nine studies including 6 case–control and 3 cohort studies met eligibility criteria. The meta-analysis showed that the PaC risk was positively correlated with HBV infection when comparing with ‘never exposed to HBV’ subgroup, the pooled RR was 1.39 (95 % CI 1.22–1.59, p < 0.00001) in chronic HBV carriers, 1.41 (95 % CI 1.06–1.87, p = 0.02) in past exposure to HBV, and 3.83 (95 % CI 1.76–8.36, p = 0.0007) in active HBV infection. Using a stratified analysis, we also found that the risk of PaC was independent of smoking, alcohol drinking, and diabetes.
Conclusion
Findings from this meta-analysis strongly support that HBV infection is associated with an increased risk of PaC.
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Abbreviations
- HBV:
-
Hepatitis B virus
- PaC:
-
Pancreatic cancer
- OR:
-
Odds ratio
- RR:
-
Relative risk
- HR:
-
Hazard ratio
- CIs:
-
Confidence intervals
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Acknowledgments
This work was supported by grants from the Chongqing Science Fund for Distinguished Young Scholars (CSTC, 2009BA5045) and the National Natural Science Foundation of China (NSFC No. 81202220).
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The authors declare that they have no conflict of interest.
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Yao Zhang and Shi-Ming Yang contributed equally to this study and should share corresponding authorship together.
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10552_2012_144_MOESM1_ESM.tif
Supplementary Figure 1 Forest plots of risk of Pac associated with chronic carrier of HBV based on research sources (hospital-based and community-based studies) (TIFF 12,423 kb)
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Luo, G., Hao, NB., Hu, CJ. et al. HBV infection increases the risk of pancreatic cancer: a meta-analysis. Cancer Causes Control 24, 529–537 (2013). https://doi.org/10.1007/s10552-012-0144-2
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DOI: https://doi.org/10.1007/s10552-012-0144-2