PC and inflammatory bowel disease: The final results showed that in IBD, with the exception of prot‐a‐1965 (peptide chain release factor 1‐like) as a risk factor (OR = 1.09; 95% CI = 1.01–1.19), prot‐a‐1356 (hydroxymethylglutaryl‐CoA synthase) (OR = 0.89; 95% CI = 0.82–0.97), prot‐a‐2026 (NDUFV2) (OR = 0.88; 95% CI = 0.80–0.97), prot‐a‐2190 (pyruvate carboxylase) (OR = 0.88; 95% CI = 0.81–0.96), prot‐a‐3015 (transmembrane protein 70) (OR = 0.91; 95% CI = 0.83–0.96), prot‐a‐63 (apoptosis‐ inducing factor 1) (OR = 0.92; 95% CI = 0.86–1.00) were protective factors.