The expression of CAMP mRNA was significantly increased in the inflamed mucosa of ulcerative colitis (UC) and Crohn's disease (CD) [52]; serum LL‐37 levels were inversely correlated with partial Mayo scores of UC patients, and the patients with high initial LL‐37 levels had a significantly better recovery than did patients with low initial LL‐37 levels after 6–18 months [53]. This evidence concerns the gene CAMP and Crohn disease.