The results showed that: (a) the AA genotype at IL-18 -607 was higher in the RCC patients than the healthy controls (Table 2); (b) the IL-18 levels were higher in the RCC patients than the healthy controls (Figure 5), which is consistent with the previous findings [36]; and (c) there was no difference in the IL-18 levels among RC patients of different IL-18 -607 genotypes. This evidence concerns the gene IL18 and renal cell carcinoma.