Suspended

QUASARGuselkumab for Active Ulcerative Colitis

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Study Aim

This study aims to evaluate the effectiveness and safety of Guselkumab in treating adults with active ulcerative colitis by assessing clinical response and remission over a 44-week period.

What is being tested

Placebo

+ Guselkumab

Drug
Who is being recruted

Colitis+5

+ Colitis, Ulcerative

+ Colonic Diseases

Over 18 Years
+9 Eligibility Criteria
See all eligibility criteria
How is the trial designed

Treatment Study

Placebo-ControlledPhase 2 & 3
Interventional
Study Start: September 2019
See protocol details

Summary

Principal SponsorJanssen Research & Development, LLC
Last updated: March 13, 2026
Sourced from a government-validated database.Claim as a partner

Study start date: September 26, 2019

Actual date on which the first participant was enrolled.

This study is focused on testing the effectiveness and safety of a medication called guselkumab for people with moderately to severely active ulcerative colitis, a condition that causes inflammation and sores in the colon. The study aims to find out if guselkumab can help reduce the symptoms and improve the quality of life for those affected by this condition. By evaluating the medication's performance, the study could provide a new treatment option that might better manage symptoms and potentially lead to remission in patients, addressing an important need for those suffering from this chronic illness. Participants in this study will receive either guselkumab or a placebo, with neither the participants nor the researchers knowing who receives which, ensuring unbiased results. The medication is likely administered through injections. The study will measure how well participants respond to the treatment by looking at their modified Mayo score, which assesses stool frequency, rectal bleeding, and endoscopic findings. These measures help determine if the treatment results in a clinical response or remission. The trial will assess outcomes at different stages, with a focus on improvements by week 12 and week 44. This structured approach helps ensure the safety and effectiveness of the treatment are thoroughly evaluated.

Official TitleA Phase 2b/3, Randomized, Double-blind, Placebo-controlled, Parallel-group, Multicenter Protocol to Evaluate the Efficacy and Safety of Guselkumab in Participants With Moderately to Severely Active Ulcerative Colitis
NCT04033445
Principal SponsorJanssen Research & Development, LLC
Last updated: March 13, 2026
Sourced from a government-validated database.Claim as a partner

Protocol

This section provides details of the study plan, including how the study is designed and what the study is measuring.
Design Details

1064 patients to be enrolled

Total number of participants that the clinical trial aims to recruit.

Treatment Study

These studies test new ways to treat a disease, condition, or health issue. The goal is to see if a new drug, therapy, or approach works better or has fewer side effects than existing options.



Eligibility

Researchers look for people who fit a certain description, called eligibility criteria: person's general health condition or prior treatments.
Conditions
Criteria

Any sex

Biological sex of participants that are eligible to enroll.

Over 18 Years

Range of ages for which participants are eligible to join.

Healthy volunteers not allowed

If individuals who are healthy and do not have the condition being studied can participate.

Conditions

Pathology

ColitisColitis, UlcerativeColonic DiseasesDigestive System DiseasesGastroenteritisGastrointestinal DiseasesIntestinal DiseasesInflammatory Bowel Diseases

Criteria

4 inclusion criteria required to participate
Documented diagnosis of ulcerative colitis (UC)

Moderately to severely active UC, defined by modified Mayo score

Demonstrated inadequate response or intolerance to medical therapies specified in the protocol

Screening laboratory test results within the parameters specified in the protocol

5 exclusion criteria prevent from participating
Presence or history of a fistula

Presence of a stoma

Diagnosis of indeterminate colitis, microscopic colitis, ischemic colitis, or Crohn's disease or clinical findings suggestive of Crohn's disease

UC limited to the rectum only or to less than ( < ) 20 centimeter (cm) of the colon

Show More Criteria

Study Plan

Find out more about all the medication administered in this study, their detailed description and what they involve.
Treatment Groups
Study Objectives

8 intervention groups are designated in this study

37.5% chance of being blinded to the placebo group

Treatment Groups

Group I

Placebo
Participants will receive matching placebo IV in Induction Study 1. Subsequent study treatment will be determined by the participant's clinical response status at Week 12. Clinical nonresponders will be administered guselkumab IV.

Group II

Placebo
Participants will receive matching placebo IV in Induction Study 2. Subsequent study treatment will be determined by the participant's clinical response status at Week 12. Clinical nonresponders will be administered guselkumab IV.

Group III

Placebo
Participants will receive matching placebo SC q4w.

Group IV

Experimental
Participants will receive guselkumab dose 1 intravenously (IV) in Induction Study 1. Subsequent study treatment will be determined by the participant's clinical response status at Week 12.

Group 5

Experimental
Participants will receive guselkumab dose 2 IV in Induction Study 1. Subsequent study treatment will be determined by the participant's clinical response status at Week 12.

Group 6

Experimental
Participants will receive guselkumab IV in Induction Study 2. Subsequent study treatment will be determined by the participant's clinical response status at Week 12.

Group 7

Experimental
Participants will receive guselkumab maintenance dose regimen 1 subcutaneously (SC) every 4 weeks (q4w).

Group 8

Experimental
Participants will receive guselkumab maintenance dose regimen 2 SC every 8 weeks (q8w).

Study Objectives

Primary Objectives

Secondary Objectives

Study Centers

These are the hospitals, clinics, or research facilities where the trial is being conducted. You can find the location closest to you and its status.

This study has 392 locations

Suspended

2-nd MHAT

Sofia, BulgariaOpen 2-nd MHAT in Google Maps
Suspended

Om Research LLC

Lancaster, United States
Suspended

UCLA

Los Angeles, United States
Suspended

Peak Gastroenterology Associates 1

Colorado Springs, United States
Suspended392 Study Centers