Clinical trial Recruiting at 1 site Phase 3 Interventional Ages 18 to 64

Upadacitinib-first versus infliximab-only rescue strategy for adults with steroid-refractory acute severe ulcerative colitis.

Official title: Comparison of Medical RESCUE Strategies for Patients With Steroid-refractory Acute Severe Ulcerative Colitis: an Open-label Randomized Controlled Trial (RESCUE-UC).

Run by McMaster University · NCT06660693 · Data updated 2026-11-12

This trial tests whether giving upadacitinib first and switching to infliximab only if needed works as well as starting with infliximab alone for adults hospitalized with steroid-refractory acute severe ulcerative colitis.

More Colitis, Ulcerative trials

Quick facts

PhasePhase 3
Study typeInterventional
Ages18 Years to 64 Years
SexAll
Enrollment134 (estimated)
SponsorMcMaster University
Academic / other
Drugs / interventionsinfliximab, upadacitinib, tofacitinib
Locations1 site (Hamilton, Ontario)
StatusRecruiting
StartedApril 16, 2025
Main results expectedMay 2027
Study endsSeptember 2027
Registry record updatedJune 22, 2025
Trial IDNCT06660693 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults aged 18–64 who are hospitalized with acute severe UC, remain steroid-refractory after at least three days of IV steroids, have a baseline endoscopy with MES ≥2, and can provide informed consent are the intended participants.

Probably not a fit

Patients who are pregnant or breastfeeding, have contraindications to JAK inhibitors or infliximab, are outside the specified age range, or do not have steroid-refractory hospitalized disease are unlikely to benefit from this protocol.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This phase 3 non-inferiority trial compares two medical rescue approaches for adults hospitalized with acute severe ulcerative colitis who have not responded to at least three days of intravenous corticosteroids. One arm gives oral upadacitinib first and uses infliximab for non-responders, while the comparator arm uses infliximab as the initial rescue therapy. Eligible participants must have endoscopic evidence of active disease (MES ≥2) and meet Oxford criteria for steroid refractoriness. The study will follow clinical outcomes and safety to determine whether the upadacitinib-first strategy provides comparable results to infliximab-first care.

Why it matters

Potential benefit: If successful, this approach could provide a convenient oral rescue option that shortens exposure to prolonged biologic immunosuppression and may reduce the need for surgery.

How similar studies have gone: Retrospective and prospective case series have suggested JAK inhibitors such as tofacitinib or upadacitinib may help in this setting, but randomized controlled evidence comparing a JAK-first versus infliximab-first strategy is limited.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria: Adult (≥ 18 - 64 years) male or non-pregnant, non-lactating female patients with:

* Confirmed diagnosis of UC, based on conventional clinical, endoscopic, and/or histologic criteria
* Admitted to hospital with acute severe flare and refractory to three days of intravenous steroids (at minimum of 40mg methylprednisolone, or equivalent, daily). Refractory is defined using the Oxford criteria at day 3 of steroid therapy: presence of \> 8 stools/day or CRP \> 45 mg/L
* Will undergo or has already undergone a baseline colonoscopy or flexible sigmoidoscopy while in hospital or in the 4 weeks preceding trial entry, with a baseline MES ≥2 based on locally evaluated endoscopy
* Provided written informed consent
* Subject is willing and able to adhere to study procedures, and describe in the procedures that screening and safety monitoring procedures will be applied as per upadacitinib and infliximab Canadian product monographs

Exclusion Criteria:

* Contraindications to receiving either infliximab or upadacitinib (as per current Canadian product monograph)
* Previously used infliximab or a JAK inhibitor for UC
* Patients \> 65 years of age
* Pregnant or breastfeeding
* Women of reproductive potential who are unwilling to agree to using effective contraception during treatment and 4 weeks following the final dose of upadacitinib
* Concurrent Clostridium difficile, other gastrointestinal infection, or other active systemic or localized infection which would preclude treatment with systemically acting biologic or small molecule therapy
* Patients with symptoms of thrombosis, or confirmed venous or arterial thromboembolism
* Active TB (patients should be tested for TB prior to upadacitinib or infliximab treatment)
* HBV/HCV positive
* Untreated malignancy or ongoing treatment for malignancy
* Concomitant treatment with strong CYP3A4 inhibitors or inducers
* Severe hepatic impairment
* Severe renal impairment (CrCl \< 30 ml/min)
* Patients who have received live vaccines in the 28 days prior to study entry.
* Patients with moderate or severe (NYHA Class III/IV) congestive heart failure.
* Patients with a history of hypersensitivity to infliximab, to other murine proteins, or to any of the excipients.
* Patients who are hypersensitive to upadacitinib or to any ingredient in the formulation, including any non-medicinal ingredient, or component of the container.

Where it's running

  • Hamilton Health Sciences
    Hamilton, Ontario, Canada
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.