Interleukin-10 gene polymorphism is associated with alcoholism but not with alcoholic liver disease.

Aims: To determine whether the functional polymorphism -592C>A of the interleukin (IL)-10 gene (IL10) influences the development of alcoholic liver disease or alcoholism in alcoholic Spanish subjects.
Methods: The -592C>A IL10 polymorphism was analyzed by the polymerase chain reaction and digestion with restriction enzymes in 257 male alcoholics [161 without alcoholic liver disease and 96 with alcoholic liver cirrhosis (ALC)] and 100 male healthy controls.
Results: We found no association between the -592C>A IL10 polymorphism and ALC. Meta-analysis combining this result and data from previous studies failed also to show any significant association between this polymorphism and alcoholic liver disease. However, the frequency of allele A carriers (CA and AA genotypes) was significantly higher in alcoholic patients (defined as patients with abuse or dependence of alcohol) than in healthy controls.
Conclusion: The -592C>A IL10 polymorphism is not related to the risk of ALC. Nevertheless, our study shows that alcoholism is associated with an excess of allele A carriers in alcoholic patients.