A Phase 1b/2a Study of Budoprutug in Systemic Lupus Erythematosus (SLE)

August 4, 2026 updated by: Climb Bio, Inc.

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)

Budoprutug is a humanized, immunoglobulin (Ig) G1 monoclonal antibody that selectively binds to CD19 and is projected to deplete targeted cells through antibody-dependent cellular cytotoxicity. This Phase 1b/2a, open-label study will evaluate budoprutug in ascending dose cohorts of patients aged 18 years and above with active, seropositive SLE and inadequate response to standard therapy. The study will also assess the pharmacokinetics, pharmacodynamics and early indications of efficacy of budoprutug in SLE, where pharmacodynamics will be evaluated as the change in the number of B cells and immunoglobulins (antibodies) in the blood over time. Budoprutug will be administered as two (2) IV infusions 14 days apart in ascending dose cohorts.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
30

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • China
      • Beijing, China
    • Sichuan
      • Mianyang, Sichuan, China, 621000
        • Active, not recruiting
        • Mianyang Central Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

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.

Study Plan

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

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Sequential Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Cohort 1: Dose Level A
Single IV dose at Day 1 and Day 15
Drug: Budoprutug
Single IV dose of study product on Day 1 and Day 15
Other Names:
  • TNT119
Experimental: Cohort 2: Dose Level B
Single IV dose at Day 1 and Day 15
Drug: Budoprutug
Single IV dose of study product on Day 1 and Day 15
Other Names:
  • TNT119
Experimental: Cohort 3: Dose Level C
Single IV dose at Day 1 and Day 15
Drug: Budoprutug
Single IV dose of study product on Day 1 and Day 15
Other Names:
  • TNT119
Experimental: Dose Expansion Cohort
Single IV dose at Day 1 and Day 15
Drug: Budoprutug
Single IV dose of study product on Day 1 and Day 15
Other Names:
  • TNT119

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Incidence of Treatment-Emergent Adverse Events (TEAEs)
Time Frame: Up to week 28
Number of participants experiencing TEAEs, graded per NCI CTCAE v6.0.
Up to week 28
Incidence of Clinical Laboratory Abnormalities
Time Frame: Up to week 28
Number of participants with clinically significant laboratory abnomalities.
Up to week 28
Incidence of dose-limiting toxicities (DLTs)
Time Frame: up to 28 weeks
Number of incidences of dose-limiting toxicities (DLTs)
up to 28 weeks
Change from Baseline in Systolic Blood Pressure
Time Frame: Up to week 28
Mean change from baseline in diastolic blood pressure (mmHg).
Up to week 28
Change from Baseline in Diastolic Blood Pressure
Time Frame: up to 28 weeks
Mean change from baseline in systolic blood pressure (mmHg).
up to 28 weeks
Change from Baseline in Heart Rate
Time Frame: up to 28 weeks
Mean change from baseline in heart rate (bpm).
up to 28 weeks
Change from Baseline in Respiratory Rate
Time Frame: up to 28 weeks
Mean change from baseline in respiratory rate
up to 28 weeks
Change from Baseline in Body Temperature
Time Frame: up to 28 weeks
Mean change from baseline in body temperature (°C)
up to 28 weeks
Change from Baseline in PR Interval
Time Frame: up to 28 weeks
Mean change from baseline in PR interval (ms)
up to 28 weeks
Change from Baseline in QRS Duration
Time Frame: up to 28 weeks
Mean change from baseline in QRS duration (ms)
up to 28 weeks
Change from Baseline in QT Interval
Time Frame: up to 28 weeks
Mean change from baseline in QT interval (ms)
up to 28 weeks
Change from Baseline in QTc Interval
Time Frame: up to 28 weeks
Mean change from baseline in corrected QT interval (QTc)
up to 28 weeks

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Area Under the Curve (AUC)
Time Frame: Up to week 28
Measurement of the area under the drug concentration-time curve
Up to week 28
Terminal Half-Life (T1/2)
Time Frame: Up to week 28
Measurement of the terminal half-life in days
Up to week 28
Incidence of Anti-Drug Antibodies (ADAs)
Time Frame: Up to week 28
Number of participants with detectable ADAs.
Up to week 28
ADA Titer Over Time
Time Frame: Up to week 28
Measurement of ADA titer over time
Up to week 28
Change from Baseline in CD20+ B-cell Count
Time Frame: Up to week 28
Change in absolute peripheral B-cell count
Up to week 28
Change from Baseline in SLEDAI-2K Score
Time Frame: up to 28 weeks
Measurement of change in SLEDAI-2K score from baseline
up to 28 weeks
Change from Baseline in Urine Protein Creatinine Ratio (UPCR)
Time Frame: up to 28 weeks
Measurement of change in UPCR from baseline
up to 28 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Climb Bio, Inc.

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Study Director, Climb Bio, Inc.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
June 30, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
September 1, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
September 1, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
April 27, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 27, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 4, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 6, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 4, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2026

More Information

Terms related to this study

Keywords

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • TNT119-SLE-102

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

Yes

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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