IL6 and Huntington disease: The polymorphism at position IL-6 -174 G/C is one of several IL-6 polymorphisms that have been suggested to affect the IL-6 expression29,30 According to our findings, there is evidence for a genetic association between the genotype of IL-6 -174 G/C except C/C, and the susceptibility to the HCV-positive HD patients was demonstrated.