IL18 and renal cell carcinoma: According to their IL-18 -607 genotype distribution, the 10 RCC patients were divided into three subgroups: four patients with the AA genotype (216.25 ± 12.79 pg/mL), four with AC (206.25 ± 31.31 pg/mL), and two with CC (219.00 ± 19.80 pg/mL).