for people ages 18 years and up (full criteria)
at San Diego, California and other locations
study started
completion around



This is an open-label, prospective, observational study with the primary objective to characterize the pharmacokinetics of infliximab in patients with Acute Severe Ulcerative Colitis.

Official Title

Pharmacokinetics of Infliximab and Tumor Necrosis Factor Concentrations in Serum, Stool, and Colonic Mucosa in Acute Severe Ulcerative Colitis


In Acute Severe Ulcerative Colitis (ASUC), drug exposure may be affected by intestinal protein loss leading to hypoalbuminemia and rapid clearance of infliximab (IFX). Importantly, 2 studies have associated the loss of IFX in stool with poor outcomes. Multiple observational studies have identified that patients with faster IFX clearance have worse clinical outcomes and higher rates of antidrug antibody formation. To better understand optimal dosing of IFX in ASUC, the pharmacokinetics of IFX in association with outcomes must be better defined in this setting.


Ulcerative Colitis, ASUC, Infliximab, Optimal Dose, Optimal Frequency, Theraputic Drug Monitoring, Colitis, Ulcer


You can join if…

Open to people ages 18 years and up

  • Present to hospital with ASUC based on Truelove and Witts criteria,33 defined as the presence of more than 6 bloody stools per day along with any 1 of the following: tachycardia > 90 beats per minute, fever > 37.8 °C, hemoglobin < 10.5 g/dL, and erythrocyte sedimentation rate (ESR) > 30 mm/h (or CRP > 30 mg/L [high-sensitivity CRP > 300 mg/L]) is a suitable surrogate if ESR is not available1).
  • Have a partial MCS > 7.
  • Have a Mayo Clinic ES ≥ 2 with disease extending 15 cm or more beyond the anal verge.
  • Require rescue inpatient IFX infusion as part of routine care. Note, the IFX treatment regimen is not defined by this protocol and any dosage regimen is acceptable for the purposes of this study, such as standard or accelerated induction regimens.
  • Be able to speak English and participate fully in all aspects of this clinical trial.
  • Provide written informed consent.

You CAN'T join if...

  • A known history of being positive for anti-IFX antibodies.
  • Have a serious active infection, active malignancy, or any other known condition contraindicated with infliximab therapy, according to current prescribing information.
  • Serious underlying disease other than ASUC, or other physical or psychosocial condition that, in the opinion of the investigator, may interfere with the subject's ability to participate fully in the study.
  • Prior enrollment in the current study.


  • UCSD
    San Diego California 92037 United States
  • London Health Sciences Center
    London Ontario N6A 5A5 Canada
  • Mount Sinai Hospital
    Toronto Ontario M5G 1X5 Canada
  • Cornell University
    New York New York 10065 United States


in progress, not accepting new patients
Start Date
Completion Date
Alimentiv Inc.
Study Type
About 18 people participating
Last Updated