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CABA-201

Phase 2

Systemic Sclerosis | Monoclonal antibody | Immunology |Cabaletta Bio, Inc.|Last Updated: Aug 26, 2026

Target and mechanism

Molecular targetCD19
Target classProtein
ModalityMonoclonal antibody

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment37

FDA Designations

ORPHAN_DRUGFAST_TRACK

Clinical trial landscape

CABA-201 · 3 trials · 6 indications

Phase 2 1Phase 1 2
NCT06328777RESET-SSc: An Open-Label Study to Evaluate the Safety and Efficacy of CABA-201, a CD19-CAR T Cell Therapy, in Subjects With Systemic SclerosisSystemic Sclerosis
RECRUITING37 Analytics
PHASE2RECRUITING
RESET-SSc: An Open-Label Study to Evaluate the Safety and Efficacy of CABA-201, a CD19-CAR T Cell Therapy, in Subjects With Systemic Sclerosis
Systemic SclerosisUnlock trial analytics

Study Endpoints

Primary Endpoints

Phase 1/2: To evaluate incidence of adverse events
Up to 28 days after CABA-201 infusion

Incidence and severity of AEs

Phase 2b Sub-study: To evaluate the efficacy of CABA-201 on % predicted forced vital capacity (FVC) in SSc-ILD subjects
Week 52

Mean change from baseline in % predicted FVC without any immunomodulatory or anti-fibrotic medications and on no or low dose of steroids

To evaluate incidence and severity of adverse events (AEs)
Up to 28 days after CABA-201 infusion

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal result of an investigation), symptom, or disease (new or exacerbated) temporally associated with the use of study treatment. The term AE is used to include both serious and non-serious AEs.

To evaluate incidence of adverse events
Up to 28 days after CABA-201 infusion

Secondary Endpoints

To evaluate adverse events and laboratory abnormalities
Up to 156 weeks (Phase 1/2) and through 104 weeks (Sub-study)
To characterize the pharmacodynamics (PD)
Up to 156 weeks (Phase 1/2) and through 104 weeks (Sub-study)
To characterize the pharmacokinetics (PK)
Up to 156 weeks (Phase 1/2) and through 104 weeks (Sub-study)
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
CABA-201 Phase 1/2EXPERIMENTALSevere Skin Cohort: Infusion of CABA-201 with preconditioning in subjects with SSc with severe skin involvement Organ Cohort: Infusion of CABA-201 with preconditioning in subjects with SSc with organ involvement
CABA-201 Phase 2b - Sub-studyEXPERIMENTALInfusion of CABA-201 with preconditioning in subjects with SSc
CABA-201EXPERIMENTALAChR Antibody-Positive Cohort or AChR Antibody-Negative Cohort
CABA-201, No PreconditioningEXPERIMENTALInfusion of CABA-201 with no preconditioning in subjects with gMG
CABA-201 with FLU/CY PreconditioningEXPERIMENTALLN Cohort: Infusion of CABA-201 with preconditioning in subjects with LN Non-renal SLE Cohort: Infusion of CABA-201 with preconditioning in subjects with non-renal SLE who do not meet criteria for inclusion in the LN cohort Expansion Cohort: Infusion of CABA-201 with preconditioning in subjects with LN and SLE

Interventions

NameTypeDescription
CABA-201BIOLOGICALSingle intravenous infusion of CABA-201 at a single dose level following preconditioning with fludarabine and cyclophosphamide
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites10

Inclusion Criteria: * Age ≥18 and ≤75 * A clinical diagnosis of SSc, based on the 2013 American College of Rheumatology and European League Against Rheumatism classification criteria. * Early active disease * Evidence of significant skin, pulmonary, or cardiac involvement Exclusion Criteria: * Co...

Countries:United StatesCanadaSpain
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Recent Changes (Last 90 Days)

LOWAug 26, 2026NCT06121297lastUpdatePostDate: changed
LOWAug 26, 2026NCT06121297lastUpdatePostDate: changed
LOWAug 19, 2026NCT06121297lastUpdatePostDate: changed
LOWAug 19, 2026NCT06121297lastUpdatePostDate: changed
LOWAug 19, 2026NCT06121297lastUpdatePostDate: changed
MEDIUMAug 17, 2026NCT06328777Enrollment: 12 → 37
MEDIUMAug 17, 2026NCT06328777Enrollment: 12 → 37
MEDIUMAug 14, 2026NCT06359041Status: ACTIVE_NOT_RECRUITING → RECRUITING
MEDIUMAug 14, 2026NCT06359041Status: ACTIVE_NOT_RECRUITING → RECRUITING
MEDIUMAug 14, 2026NCT06359041Status: ACTIVE_NOT_RECRUITING → RECRUITING
LOWJul 22, 2026NCT06328777lastUpdatePostDate: changed
LOWJul 22, 2026NCT06328777lastUpdatePostDate: changed

Frequently asked questions about CABA-201

What is CABA-201 used for?

CABA-201 is an investigational CD19-targeted therapy being studied for systemic lupus erythematosus (SLE), systemic sclerosis, and generalized myasthenia gravis (gMG). It is a monoclonal antibody-based CAR T cell therapy in Phase 1 and Phase 2 clinical trials for these autoimmune conditions.

What does CABA-201 target?

CABA-201 targets CD19, a protein found on B cells. By targeting CD19, the therapy is designed to deplete B cells involved in autoimmune disease. It is being evaluated in clinical trials for systemic lupus erythematosus, systemic sclerosis, and generalized myasthenia gravis.

Who makes CABA-201?

CABA-201 is being developed by Cabaletta Bio, Inc., a biopharmaceutical company traded on the Nasdaq under the ticker symbol CABA. The company is conducting clinical trials of CABA-201 in multiple autoimmune indications.

What phase is CABA-201 in?

CABA-201 is in Phase 1 and Phase 2 clinical trials. It is an investigational therapy, not yet approved by the FDA. The drug has received Orphan Drug and Fast Track designations from the FDA for its studied indications.

What clinical trials is CABA-201 in?

CABA-201 is being studied in three open-label trials: NCT06121297 (RESET-SLE) for systemic lupus erythematosus, NCT06328777 (RESET-SSc) for systemic sclerosis, and NCT06359041 (RESET-MG) for generalized myasthenia gravis. All trials are recruiting participants in the United States, with the SLE trial also enrolling in Canada and Spain.

Is CABA-201 the same as a CAR T cell therapy?

Yes, CABA-201 is a CD19-CAR T cell therapy. It is designed to target CD19 on B cells and is being investigated for autoimmune diseases including systemic lupus erythematosus, systemic sclerosis, and generalized myasthenia gravis.