Distinct cutoff values of adalimumab trough levels are associated with different therapeutic outcomes in patients with inflammatory bowel disease

Abstract

Background and Aims: We aimed to evaluate the relationship of serum adalimumab trough levels (ATL) with disease activity of inflammatory bowel disease (IBD) patients in a large, well-characterized referral center-based cohort. Methods: We compared serum ATL between those with clinical, biochemical, or endoscopic/radiologic disease activity and those without. Results: A total of 236 patients with IBD were included. Higher cutoff levels were associated with endoscopic and/or radiologic responses (cutoff value: 5.3 mcg/mL, P = 0.003) compared with improvement in C-reactive protein (cutoff value: 4.3 mcg/mL, P = 0.031). Conclusions: Higher cutoff ATL was associated with endoscopic and/or radiologic response.