Statistically significant differences were not observed in the frequencies of genotypes and alleles of the IL1B-511 C/T, IL6-174 C/G and IFNGR1-56 T/C polymorphisms between GD patients and controls, and the IL1B-511 C/T and IFNGR1-56 C/T polymorphisms between HT patients and controls. This evidence concerns the gene IFNGR1 and hematocrit.