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Updated May 2026 · ClinicalTrials.gov

RECRUITINGPhase 3INTERVENTIONAL

Transmural Healing and Disease-Modifying Effect of Guselkumab in Crohn's Disease Patients

A Phase 3b, Open-label, Multicenter Study to Evaluate Transmural Healing and Disease Modifying Effect of Guselkumab in Crohn's Disease Patients

Transmural Healing and Disease-Modifying Effect of Guselkumab in Crohn's Disease Patients (NCT06408935) is a Phase 3 interventional studying Crohn's Disease, sponsored by Janssen-Cilag Ltd.. RECRUITING as of the most recent ClinicalTrials.gov update. Talk to your doctor before contacting the trial site.

Important: This information is not medical advice. Talk to your doctor about whether a clinical trial is right for you.

About This Trial

The purpose of this study is to evaluate the efficacy of guselkumab in healing of all layers of the digestive tract (transmural healing) with the help of a score called Magnetic Resonance Index of Activity (MaRIA) based on a scan at Week 48.

What Stage of Research Is This?

Phase 3 trials confirm efficacy and safety in large patient groups (often 300–3,000+) and form the evidence base for an FDA approval submission. For Crohn's Disease, Phase 3 studies typically randomize participants between the investigational treatment and either a placebo or current standard of care. A successful Phase 3 result is the threshold most treatments need to clear before regulatory approval.

This trial is currently recruiting participants. The sponsor has registered the study with ClinicalTrials.gov as actively enrolling, which means new applicants who meet the eligibility criteria can be considered for screening. Trial status can change between updates — confirm current recruiting status with the study contact before traveling for a screening visit.

Target enrollment of 112 participants puts this in the typical range for a Phase 2-style efficacy study or a moderate Phase 3 trial in a focused Crohn's Disease subpopulation. At this scale, the study has enough statistical power to detect a clear treatment effect but is not the largest cohort in the field.

Who May Be Eligible (Plain English)

Who May Qualify: - Has luminal Crohn's disease (CD) of at least 3 months duration (defined as a minimum of 12 weeks), with colitis, ileitis, or ileocolitis, confirmed at any time in the past by radiography, histology, and/or endoscopy - Has clinically active CD, defined as a baseline CD activity index (CDAI) score greater than or equal to (\>=)220 but \<=450 and either: a. Mean daily stool frequency (SF) count \>=4, based on the unweighted CDAI component of the number of liquid or very soft stools or b. Mean daily AP score \>=2, based on the unweighted CDAI component of abdominal pain (AP) - Active transmural activity in at least one segment (segmental magnetic resonance index of activity \[MaRIA\] \>= 11) - a. Has demonstrated inadequate response/intolerance to conventional therapy; b. Has previously demonstrated lack of initial response (that is, primary non-responders), responded initially but then lost response with continued therapy (that is, secondary non-responders), or was intolerant to a maximum of 1 class of advanced therapies at a dose approved for the treatment of Crohn's disease (that is, janus kinase \[JAK\] inhibitors, infliximab, adalimumab, certolizumab pegol, vedolizumab, ustekinumab, or approved biosimilars for these agents) Who Should NOT Join This Trial: - Has complications of Crohn's disease, such as symptomatic strictures or stenoses (unless less than \[\<\]3 centimeter (cm) dilatation and not symptomatic or displaying associated fistula/fistulae and/or or abscess), fibrotic stenosis, internal fistulas, short gut syndrome, or any other manifestation, that might be anticipated to require surgery, could preclude the use of the CDAI to assess response to therapy, or would possibly confound the ability to assess the effect of treatment with guselkumab ...See full criteria on ClinicalTrials.gov Always talk to your doctor about whether this trial is right for you.

These are translations of the protocol\'s inclusion and exclusion criteria, simplified for patients and caregivers. The original clinical text appears below. Eligibility is ultimately confirmed by the trial site\'s screening process — this summary is a starting point for a conversation with your doctor, not a final determination.

Original Eligibility Criteria

View original clinical language
Inclusion Criteria: * Has luminal Crohn's disease (CD) of at least 3 months duration (defined as a minimum of 12 weeks), with colitis, ileitis, or ileocolitis, confirmed at any time in the past by radiography, histology, and/or endoscopy * Has clinically active CD, defined as a baseline CD activity index (CDAI) score greater than or equal to (\>=)220 but \<=450 and either: a. Mean daily stool frequency (SF) count \>=4, based on the unweighted CDAI component of the number of liquid or very soft stools or b. Mean daily AP score \>=2, based on the unweighted CDAI component of abdominal pain (AP) * Active transmural activity in at least one segment (segmental magnetic resonance index of activity \[MaRIA\] \>= 11) * a. Has demonstrated inadequate response/intolerance to conventional therapy; b. Has previously demonstrated lack of initial response (that is, primary non-responders), responded initially but then lost response with continued therapy (that is, secondary non-responders), or was intolerant to a maximum of 1 class of advanced therapies at a dose approved for the treatment of Crohn's disease (that is, janus kinase \[JAK\] inhibitors, infliximab, adalimumab, certolizumab pegol, vedolizumab, ustekinumab, or approved biosimilars for these agents) Exclusion Criteria: * Has complications of Crohn's disease, such as symptomatic strictures or stenoses (unless less than \[\<\]3 centimeter (cm) dilatation and not symptomatic or displaying associated fistula/fistulae and/or or abscess), fibrotic stenosis, internal fistulas, short gut syndrome, or any other manifestation, that might be anticipated to require surgery, could preclude the use of the CDAI to assess response to therapy, or would possibly confound the ability to assess the effect of treatment with guselkumab * Currently has or is suspected to have an abscess. Recent cutaneous and perianal abscesses are not exclusionary if drained and adequately treated at least 3 weeks before baseline, or 8 weeks before baseline for intra-abdominal abscesses, provided that there is no anticipated need for any further surgery. Participants with active perianal fistulas may be included if there are no associated stenoses, no anticipated surgery and no abscesses currently identified * Has had any kind of bowel resection within 6 months, or any other intra-abdominal or other major surgery within 12 weeks before baseline * Has a draining (that is, functioning) stoma or ostomy * Has a stool culture or other examination positive for an enteric pathogen, including Clostridioides difficile (formerly known as Clostridium difficile) toxin, in the previous 4 months, unless a repeat examination is negative and there are no signs of ongoing infection with that pathogen

Treatments Being Tested

DRUG

Guselkumab

Guselkumab will be administered IV and SC.

Locations (20)

Trial sites listed on ClinicalTrials.gov for this study. Site activation status can vary — confirm with the specific site before traveling for a screening visit.

Center for Colitis and Crohns Disease University of California
San Francisco, California, United States
The University of Chicago Medical Center (UCMC)
Chicago, Illinois, United States
Washington University School Of Medicine
St Louis, Missouri, United States
Medical University of South Carolina
Charleston, South Carolina, United States
The Queen Elizabeth Hospital
Adelaide, Australia
Concord Repatriation General Hospital
Concord, Australia
Northern Hospital
Melbourne, Australia
Fiona Stanley Hospital
Murdoch, Australia
Mater Hospital Brisbane
South Brisbane, Australia
AZ Maria Middelares
Ghent, Belgium
CHU de Liege
Liège, Belgium
Vitaz
Sint-Niklaas, Belgium
Cliged
Macaé, Brazil
Instituto Mederi de Pesquisa e Saude
Passo Fundo, Brazil
NPCRS Nucleo de Pesquisa Clinica do Rio Grande do Sul
Porto Alegre, Brazil
INTEGRAL Pesquisa e Ensino
Votuporanga, Brazil
Foothills Hospital
Calgary, Alberta, Canada
Western University & London Health Sciences Centre
London, Ontario, Canada
Hopital du Sacre-Coeur de Montreal
Montreal, Quebec, Canada
Nemocnice Ceske Budejovice a s
České Budějovice, Czechia

How to Talk to Your Doctor About This Trial

Bring the printable summary of this trial — including the NCT ID (NCT06408935), the sponsor (Janssen-Cilag Ltd.), and the key eligibility criteria — to your next appointment. Your doctor can review the inclusion and exclusion criteria against your medical history, lab values, and current treatments to assess whether you are likely to qualify. They can also help you weigh whether trial participation makes sense alongside your existing care plan.

Useful questions to walk through together: What does the trial protocol require beyond standard care? How long is the active treatment phase, and how long is follow-up? Are there study visits at sites I can reach? Who pays for the trial-specific procedures, and who pays for standard-of-care portions? See our 25 questions to ask about clinical trials guide for a more complete checklist.

Authoritative Sources

The official record for this trial lives on ClinicalTrials.gov — the federal registry maintained by the National Library of Medicine at NIH. For background on how this trial fits into the FDA approval pathway, see the FDA drug approval process. For oncology-specific guidance for patients considering trials, the National Cancer Institute publishes patient-oriented overviews. International trial registries are aggregated by the WHO ICTRP.

Frequently Asked Questions

What is the NCT06408935 clinical trial studying?

The purpose of this study is to evaluate the efficacy of guselkumab in healing of all layers of the digestive tract (transmural healing) with the help of a score called Magnetic Resonance Index of Activity (MaRIA) based on a scan at Week 48. The full protocol is registered on ClinicalTrials.gov and includes the primary outcome measures, eligibility criteria, and study endpoints.

Who can participate in NCT06408935?

Eligibility for this trial depends on the specific inclusion and exclusion criteria set by the sponsor. The plain-English summary above translates the most important criteria into accessible language; the official clinical text is preserved in the collapsible section underneath. Whether you fit any specific trial is a medical decision your doctor needs to confirm — bring the trial information to your treating physician for a full review against your medical history.

How do I contact the trial site for NCT06408935?

Contact information registered with ClinicalTrials.gov is shown in the sidebar of this page. Before reaching out, confirm with your treating physician that this trial is appropriate for your situation. The trial site will then walk you through the screening process to determine final eligibility.

Is participating in a clinical trial safe?

Clinical trials in the United States are regulated by the FDA and overseen by Institutional Review Boards (IRBs) that review the protocol for safety. Risk varies by trial — Phase 1 studies test new treatments in humans for the first time, while Phase 3 trials use treatments that have already passed earlier safety screening. The informed consent document for any specific trial details the known risks and what to expect. Discuss those risks with your physician before deciding whether to participate.

Where can I verify the data on this page?

Every detail on this page comes directly from the ClinicalTrials.gov API. Click "View on ClinicalTrials.gov" in the sidebar to see the official, unmodified record. The federal record is always authoritative; this page is a structured presentation with a plain-English eligibility translation. For background on how clinical trials are regulated, see the FDA drug approval process documentation.

How This Page Is Built

Every field on this page is pulled directly from the ClinicalTrials.gov API v2 — no estimates, no proxies. The plain-English eligibility translation is generated from the original protocol text and reviewed for fidelity to the underlying clinical criteria. The original clinical text remains visible in the collapsible section above so users and clinicians can verify the translation. Read the full methodology for the data pipeline and known limitations.

Source: ClinicalTrials.gov API v2 record for NCT06408935. Maintained by the National Library of Medicine at NIH. Public domain. Cite as: "TrialFinderData. NCT06408935. Data: ClinicalTrials.gov."

Medical disclaimer: This page is informational, not medical advice. Talk to your doctor about whether a clinical trial is right for you.

Last updated 2026-05-08 · Data from ClinicalTrials.gov.