Original article
The Association Between Diabetes and Hepatocellular Carcinoma: A Systematic Review of Epidemiologic Evidence

https://doi.org/10.1016/j.cgh.2005.12.007Get rights and content

Background & Aims: We conducted a systematic review and a meta-analysis to estimate the magnitude and determinants of association between diabetes and hepatocellular carcinoma (HCC). Methods: MEDLINE searches were conducted for published full studies (between January 1966 and February 2005) that provided risk estimates and met criteria concerning the definition of exposure and outcomes. Two investigators independently performed standardized search and data abstraction. Unadjusted and adjusted odds ratios for individual outcomes were obtained or calculated for each study and were synthesized using a random-effects model. Results: A total of 26 studies met our inclusion and exclusion criteria. Among 13 case-control studies, diabetes was associated significantly with HCC in 9 studies (pooled odds ratio, 2.5; 95% confidence interval, 1.8–3.5). Among 13 cohort studies, diabetes was associated significantly with HCC in 7 studies (pooled risk ratio, 2.5; 95% confidence interval, 1.9–3.2). The results were relatively consistent in different populations, different geographic locations, and a variety of control groups. The significant association between HCC and diabetes was independent of alcohol use or viral hepatitis in the 10 studies that examined these factors. Few studies adjusted for diet and obesity. Conclusions: Diabetes is associated with an increased risk for HCC. However, more research is required to examine issues related to the duration and treatment of diabetes, and confounding by diet and obesity.

Section snippets

Literature Search

We searched MEDLINE for studies published in English from January 1966 through February 2005. The search strategy included “diabetes AND (hepatocellular carcinoma OR HCC OR liver cancer) AND (risk OR odds OR incidence).” A hand search of cited bibliographies also was performed. Only fully published articles were considered.

Study Selection Criteria

We searched for analytic epidemiologic studies (cross-sectional, case-control, or cohort study design) that examined the association between diabetes and HCC. We excluded

Case-Control Studies

Thirteen case-control studies met the inclusion and exclusion criteria of the review.13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 The characteristics of these studies are shown in Table 1. Five studies were from the United States, 2 from Greece, 2 from Italy, 1 from the United Kingdom, and 3 studies were from the same single-district hospital in Japan. Diabetes was defined based on in-person or mailed questionnaires in 10 studies and based on chart review or diagnostic codes in 3 studies.

Discussion

This systematic review of published epidemiologic studies indicates that type 2 diabetes is associated with an approximately 2.5-fold increase in the risk for HCC. The risk estimate from 13 case-control studies indicates a statistically significant 2.5-fold increased odds of diabetes among patients with HCC compared with controls without diabetes. Similarly, the pooled estimates from 13 cohort studies indicate a statistically significant 2.5-fold increase in HCC incidence among patients with

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