Baseline Clearance of Infliximab Is Associated With Requirement for Colectomy in Patients With Acute Severe Ulcerative Colitis.

TitleBaseline Clearance of Infliximab Is Associated With Requirement for Colectomy in Patients With Acute Severe Ulcerative Colitis.
Publication TypeJournal Article
Year of Publication2021
AuthorsBattat R, Hemperly A, Truong S, Whitmire N, Boland BS, Dulai PS, Holmer AK, Nguyen NH, Singh S, Casteele NVande, Sandborn WJ
JournalClin Gastroenterol Hepatol
Date Published2021 03
KeywordsColectomy, Colitis, Ulcerative, Gastrointestinal Agents, Humans, Infliximab, ROC Curve, Severity of Illness Index, Treatment Outcome

BACKGROUND & AIMS: Hospitalized patients with acute severe ulcerative colitis (ASUC) often require surgery. Although the tumor necrosis factor antagonist infliximab is an effective salvage therapy to prevent colectomy in patients with ASUC, optimal dosing is unclear. Calculated infliximab clearance has been associated with important outcomes in patients with ulcerative colitis, but its utility in patients with ASUC has not been established. We assessed the relationship between calculated the baseline infliximab clearance before infliximab salvage therapy and the requirement for colectomy in patients hospitalized for ASUC.

METHODS: We obtained data from hospitalized patients with ASUC who initiated infliximab therapy. We then calculated the baseline infliximab drug clearance in these patients based on an existing formula. The primary aim was to compare clearance between patients who required colectomy 6 months later and patients who did not require colectomy. Receiver operating characteristic curve analyses evaluated clearance thresholds for colectomy. Multivariable logistic regression analysis evaluated factors associated with colectomy.

RESULTS: In 39 patients with ASUC, the median baseline calculated clearance was higher in patients requiring colectomy at 6 months than in patients without colectomy (0.733 vs 0.569 L/d; P = .005). An infliximab clearance threshold of 0.627 L/d identified patients who required colectomy with 80.0% sensitivity and 82.8% specificity (area under the curve, 0.80). A higher proportion of patients with infliximab clearance of 0.627 L/d or more underwent colectomy within 6 months (61.5%) than patients with lower infliximab clearance values (7.7%) (P = .001). Multivariable analysis identified baseline infliximab clearance as the only factor associated with colectomy. The infliximab dose in the hospital was higher in patients who required colectomy. Results were similar at 30 days and 1 year.

CONCLUSIONS: In patients hospitalized with ASUC, higher values of calculated infliximab clearance before infliximab administration is associated with higher rates of colectomy. Although patients who required colectomies received higher doses, data on infliximab concentrations are lacking. Infliximab pharmacokinetic models are needed for patients with ASUC to allow comparative trials on clearance-based vs standard dosing.

Alternate JournalClin Gastroenterol Hepatol
PubMed ID32348905
PubMed Central IDPMC7606215
Grant ListK23 DK117058 / DK / NIDDK NIH HHS / United States
KL2 TR001444 / TR / NCATS NIH HHS / United States
P30 DK120515 / DK / NIDDK NIH HHS / United States
T32 DK007202 / DK / NIDDK NIH HHS / United States