In patients with IBD, IL-6 values were correlated with years of disease duration (rs = −0.219 (−0.402 – −0.019), p = 0.032), CRP values (rs = 0.301 (0.091–0.485), p = 0.006), and FC concentration (rs = 0.331 (0.104–0.525), p = 0.005); IL-8 values resulted correlated only with FC (rs = 0.293 (0.062–0.494), p = 0.014) (Figure 2). This evidence concerns the gene CXCL8 and irritable bowel syndrome.