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Olsen, J.H. et al.

Antiepileptic treatment and risk for hepatobiliary cancer and malignant lymphoma.

The possible influence of phenobarbital and phenytoin treatment on cancer risk was investigated in a case-control study nested in a cohort of 8004 epileptic patients in Denmark. Information on anticonvulsive treatments was abstracted for 95% of 60 patients with cancers of the liver and biliary tract or malignant lymphoma and for 94% of 171 cancer-free control patients. Use of anticonvulsive drugs was correlated with angiographic procedures that used Thorotrast, a well-known human liver carcinogen. After exclusion of study subjects exposed to Thorotrast, no association was seen between treatment with phenobarbital and cancer of the liver (odds ratio, 1.0; 95% confidence interval, 0.1-8.0) or biliary tract (odds ratio, 0.8; 95% confidence interval, 0.1-4.2). Furthermore, a histopathological evaluation of slides from 7 of 9 liver cancer patients not treated with Thorotrast revealed that 3 of the 4 cases of hepatocellular carcinoma involved cirrhosis of the liver, which suggested an etiological role for alcohol or viral hepatitis. A possible link was observed between use of phenytoin and risk for non-Hodgkin's lymphoma (1.8; 0.5-6.6), with a rising trend in risk with increasing dose. Our results suggest that the increased risk for cancers of the liver and biliary tract among Danish epileptic patients is likely to be due to Thorotrast administration and factors associated with cirrhosis of the liver rather than to anticonvulsive treatment.[1]

References

Antiepileptic treatment and risk for hepatobiliary cancer and malignant lymphoma. Olsen, J.H., Schulgen, G., Boice, J.D., Whysner, J., Travis, L.B., Williams, G.M., Johnson, F.B., McGee, J.O. Cancer Res. (1995) [Pubmed]

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