Budoprutug in systemic lupus erythematosus (SLE)
Official title: A Phase 1b/2a Open-Label, Dose-Escalation and Dose-Expansion Study to Evaluate Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of Budoprutug (TNT119) in Adult Subjects With Systemic Lupus Erythematosus (SLE)
Run by Climb Bio, Inc. · NCT07564596 · Data updated 2026-11-12
A phase 1b/2a study in adults with active SLE will test two-dose levels of Budoprutug given by two IV infusions 14 days apart to see if it lowers B cells and improves disease activity in people who haven’t fully responded to standard therapy.
Quick facts
| Phase | Phase1; Phase2 |
|---|---|
| Study type | Interventional |
| Ages | 18 Years to 65 Years |
| Sex | All |
| Enrollment | 30 (estimated) |
| Sponsor | Climb Bio, Inc. Industry-sponsored |
| Locations | 10 sites (Mianyang, Sichuan and 9 other locations) |
| Status | Recruiting |
| Started | June 30, 2026 |
| Main results expected | September 2027 |
| Study ends | September 2027 |
| Registry record updated | October 20, 2026 |
| Trial ID | NCT07564596 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Adults aged 18–65 with active seropositive SLE (SLEDAI-2K ≥6) who have not adequately responded to standard therapy.
✕Probably not a fit
Patients with active neuropsychiatric SLE, certain lupus nephritis requiring induction therapy, or overlapping autoimmune conditions may derive limited or no benefit.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This open-label, dose-escalation study will evaluate Budoprutug, a humanized anti-CD19 monoclonal antibody, in adults with active seropositive SLE. Participants will receive ascending doses of Budoprutug as two IV infusions 14 days apart, with pharmacokinetics, pharmacodynamics (changes in B cells and immunoglobulins), and early efficacy signals monitored. The trial focuses on safety, tolerability, and initial signs of clinical benefit in patients who have inadequate responses to standard treatments. Eligibility includes adults 18–65 with SLE confirmed by recognized criteria and active disease; certain neuropsychiatric or nephritic conditions are exclusionary. The study is sponsored by Climb Bio, Inc. and includes sites in China (Mianyang, Baoji, and Beijing).
Why it matters
Potential benefit: If successful, Budoprutug could offer a new targeted option for reducing disease activity in SLE.
How similar studies have gone: CD19-targeted monoclonal antibodies have shown activity in autoimmune diseases in early-phase trials, but this approach in SLE is exploratory.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: 1. Aged 18 to 65 years at the time of consent. 2. Diagnosis of SLE according to the 2019 European League Against. Rheumatism and the American College of Rheumatology (ACR) classification criteria. 3. Active, seropositive disease, with SLEDAI 2K \>=6 at screening 4. Inadequate response to at least one therapeutic intervention Exclusion Criteria: 1. Active neuropsychiatric SLE. 2. Active lupus nephritis type III or IV that is expected to require induction therapy during the study or recently treated with induction therapy within 12 weeks. 3. Prior diagnosis of, or fulfills diagnostic criteria for, other autoimmune or inflammatory disease that may confound clinical assessments or increase subject risk in the study 4. Active systemic infection or history of chronic, recurrent, latent, or recent serious infections.
Where it's running
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Baoji Central Hospital
Baoji, China Recruiting -
Peking University People's Hospital
Beijing, China Recruiting -
Shanxi Bethune Hospital
Taiyuan, China Recruiting -
Mianyang Central Hospital
Mianyang, Sichuan, China Active not recruiting -
The First Affiliated Hospital of Bengbu Medical College
Bengbu, China Not yet recruiting -
Xiangya Second Hospital of Central South University
Changsha, China Not yet recruiting
Show 4 more locations
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The First Affiliated Hospital of the University of Science
Hefei, China Not yet recruiting -
The First Affiliated Hospital of Nanchang
Nanchang, China Not yet recruiting -
The Second Affiliated Hospital of Soochow University
Suzhou, China Not yet recruiting -
Zaozhuang Municipal Hospital
Zaozhuang, China Not yet recruiting
Study contacts
- Study coordinator: Climb Bio Study Director
- Email: clinicaltrials@climbbio.com
- Phone: +1 8668572596
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.