Compared with subjects with cystitis, immunoreactivity for IL-17A, IL-17 F and IL-17RC was significantly elevated in the group of bladder cancer (p < 0.01), while immunoreactivity of IL-17E, IL-17RA and IL-17RB, and the infiltrating neutrophils were decreased (p < 0.05). The gene discussed is IL17RC; the disease is chronic cystitis.