A Phase 1b/2a Study of Budoprutug in Subjects With Immune Thrombocytopenia (ITP)

NCT ID: NCT07043946

Last Updated: 2026-01-07

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

RECRUITING

Clinical Phase

PHASE1/PHASE2

Total Enrollment

24 participants

Study Classification

INTERVENTIONAL

Study Start Date

2025-06-30

Study Completion Date

2028-08-31

Brief Summary

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The main objective is to assess the safety and tolerability of budoprutug in adults with ITP. Pharmacokinetics, pharmacodynamics, and preliminary clinical efficacy will also be assessed.

Detailed Description

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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, sequential-cohort, dose escalation and expansion study will evaluate the safety, tolerability, PK, PD, and preliminary clinical effectiveness of budoprutug in subjects with ITP. Budoprutug will be administered as two (2) IV infusions 14 days apart in ascending dose cohorts of patients aged 18 years and above with a platelet count \< 30,000/µL despite an adequate trial of at least one prior therapeutic attempt.

Conditions

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Immune Thrombocytopenia (ITP) ITP Biologics Monoclonal Anti-CD19

Study Design

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Allocation Method

NON_RANDOMIZED

Intervention Model

SEQUENTIAL

This is an open-label study in which subjects will be enrolled into three dose ascending cohorts. Each subject's participation will last approximately 51 weeks including the Screening and Qualifying Visits (up to 3 weeks), Treatment Period (2 weeks), and follow-up visits though Week 48. Following completion of the dose escalation phase, additional subjects will be enrolled into an expansion cohort at the selected dose level(s) identified in Part 1b.
Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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Cohort 1: Dose Level A

Single IV dose of study product on Day 1 and on Day 15

Group Type EXPERIMENTAL

Budoprutug

Intervention Type DRUG

Single IV dose of study product on Day 1 and Day 15

Cohort 2: Dose Level B

Single IV dose of study product on Day 1 and on Day 15

Group Type EXPERIMENTAL

Budoprutug

Intervention Type DRUG

Single IV dose of study product on Day 1 and Day 15

Cohort 3: Dose Level C

Single IV dose of study product on Day 1 and on Day 15

Group Type EXPERIMENTAL

Budoprutug

Intervention Type DRUG

Single IV dose of study product on Day 1 and Day 15

Dose Expansion Cohort

Single IV dose of study product on Day 1 and Day 15

Group Type EXPERIMENTAL

Budoprutug

Intervention Type DRUG

Single IV dose of study product on Day 1 and Day 15

Interventions

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Budoprutug

Single IV dose of study product on Day 1 and Day 15

Intervention Type DRUG

Other Intervention Names

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TNT119

Eligibility Criteria

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Inclusion Criteria

1. Aged 18 years at the time of consent.
2. Platelet count \< 30,000/µL despite an adequate trial of at least one prior therapeutic attempt. Platelet counts of \< 30,000/µL must be confirmed on 2 occasions at least 5 days apart, but no more than 14 days apart.
3. Partial thromboplastin time \< 1.5 x upper limit of normal (ULN), prothrombin time \< 1.5 x ULN, total bilirubin \< 1.5 x ULN unless due to Gilbert's syndrome, or an international normalized ratio \< 1.5 at screening.

Exclusion Criteria

1. CD19+ B cell count \< 80 cells/µL at Screening, or \< 40 cells/µL if B-cell depleting therapy was received within 24 weeks to 2 years prior.
2. Diagnosis of paroxysmal nocturnal hemoglobinuria, Evan's Syndrome, or other bleeding disorders affecting safety or data integrity.
3. Prior B-cell depleting therapy (e.g., rituximab) within 24 weeks before first dose or planned during the study.
4. Chronic use of anticoagulants or antiplatelet agents (e.g., aspirin, NSAIDs, thienopyridines) within 14 days before dosing through follow-up. Intermittent NSAID use is allowed.
5. Immunosuppressants (excluding corticosteroids) within 30 days or 5× half-life before Screening; alkylating agents within 180 days.
6. IVIg treatment within 90 days prior to Screening.
7. Active ITP treatment (other than steroids or TPO agonists) within 30 days or 5× half-life before first dose, unless approved by Medical Monitor.
8. Active, chronic, or latent infections including hepatitis B/C or HIV.
9. Active TB or high TB risk.
Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Climb Bio, Inc.

INDUSTRY

Sponsor Role lead

Responsible Party

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Responsibility Role SPONSOR

Principal Investigators

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Study Director

Role: STUDY_DIRECTOR

Climb Bio, Inc.

Locations

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Climb Bio Investigative Site #359202

Plovdiv, , Bulgaria

Site Status RECRUITING

Climb Bio Investigative Site #359203

Plovdiv, , Bulgaria

Site Status RECRUITING

Climb Bio Investigative Site #359201

Sofia, , Bulgaria

Site Status RECRUITING

Climb Bio Investigative Site #300204

Athens, Attica, Greece

Site Status NOT_YET_RECRUITING

Climb Bio Investigative Site #300203

Chaïdári, Attica, Greece

Site Status NOT_YET_RECRUITING

Climb Bio Investigative Site #300202

Ioannina, , Greece

Site Status NOT_YET_RECRUITING

Climb Bio Investigative Site #300201

Thessaloniki, , Greece

Site Status NOT_YET_RECRUITING

Climb Bio Investigative Site #381201

Belgrade, , Serbia

Site Status RECRUITING

Climb Bio Investigative Site #381202

Belgrade, , Serbia

Site Status RECRUITING

Climb Bio Investigative Site #381203

Novi Sad, , Serbia

Site Status RECRUITING

Climb Bio Investigative Site #340206

Burgos, , Spain

Site Status NOT_YET_RECRUITING

Climb Bio Investigative Site #340204

Madrid, , Spain

Site Status NOT_YET_RECRUITING

Climb Bio Investigative Site #340202

San Pedro, , Spain

Site Status NOT_YET_RECRUITING

Climb Bio Investigative Site #340203

Valencia, , Spain

Site Status NOT_YET_RECRUITING

Climb Investigative Site #380204

Ivano-Frankivsk, , Ukraine

Site Status RECRUITING

Climb Investigative Site #2380203

Kyiv, , Ukraine

Site Status RECRUITING

Climb Investigative Site #380202

Kyiv, , Ukraine

Site Status RECRUITING

Climb Investigative Site #380206

Kyiv, , Ukraine

Site Status RECRUITING

Climb Investigative Site #380201

Lviv, , Ukraine

Site Status RECRUITING

Countries

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Bulgaria Greece Serbia Spain Ukraine

Central Contacts

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Climb Bio Study Director

Role: CONTACT

+1 866 857 2596

Other Identifiers

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TNT119-ITP-201

Identifier Type: -

Identifier Source: org_study_id

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