UCAR T-cell Therapy Targeting CD19/BCMA in Patients With r/r Myasthenia Gravis

Early Phase 1

Not yet recruiting

• Conditions: Myasthenia Gravis
• Interventions: Biological: UCAR T-cell group

• Registration Number: NCT06933563
• Lead Sponsor: Zhejiang University

Brief Summary

This is an open label, single-site, dose-escalation study in up to 18 participants with relapsed or refractory Myasthenia gravis. This study aims to evaluate the safety and efficacy of the treatment with universal CD19/BCMA CAR T-cells.

Detailed Description

This is an investigator-initiated trial to evaluate the safety and efficacy of universal CD19/BCMA CAR T-cells in Relapsed or Refractory Myasthenia gravis.

Study intervention consists of a single infusion of universal CAR T-cells administered intravenously after a lymphodepleting therapy regimen consisting of fludarabine and cyclophosphamide.

Interim analysis will be performed when participants finish the visit 90 days after CAR T-cell infusion.

Study Timeline

• Status Verified: 2025-04
• Study Start: 2025-04
• Study First Submitted: 2025-04-02
• Study First Submitted QC: 2025-04-16
• Last Update Submitted: 2025-04-16
• Study First Posted: 2025-04-18
• Last Update Posted: 2025-04-18
• Primary Completion: 2026-04
• Study Completion: 2027-11

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 18

Inclusion Criteria

1. Age ≥ 18 years

2. Flow cytometry detected positive B cell CD19 or BCMA in the patient's peripheral blood.

3. Patients with relapsed refractory myasthenia gravis (MG) who have positive abnormal antibodies, the total score of MG-ADL ≥5, and the eye muscle score < 50% of the total score; It is classified as Grade II-IV according to the 2020 MGFA diagnostic criteria.

4. Specific requirements include: i. Receiving standardized treatment with at least one immunosuppressant for more than 1 year, and having any of the following malcontrolled conditions: 1) persistent inability to affect daily life; 2) Aggravation of MG symptoms and/or crisis episodes occur despite standard treatment; 3) Inability to tolerate immunosuppressive therapy. ii. plasma exchange or maintenance of intravenous immunoglobulin therapy is required.

5. Functional requirements for major organs are as follows:

   1. The bone marrow function needs to meet: a Neutrophil count ≥ 1.5× 10 ^ 9/L; b. Hemoglobin ≥90g/L: c. Platelets ≥ 80 × 10 ^ 9/L.
   2. Liver function: ALT ≤ 3 × UL; AST ≤ 3×ULN# Total bilirubin ≤ 2.0 ×ULN (excluding Gilbert syndrome, total bilirubin ≤ 3.0 × ULN).
   3. Renal function: creatinine clearance rate (CrCl) ≥ 30 ml/min(Cockcroft/Gault formula, excluding acute CrCl decline caused by the disease itself).

6. Female subjects of childbearing potential and male subjects with partners of childbearing potential must use medically approved contraception or abstinence during the study treatment period and for at least 6 months after the end of the study treatment; Female subjects of childbearing potential must have a negative Human chorionic gonadotropin (HCG) test within 7 days before study enrollment and not be lactating.

7. Willing to participate in this clinical study, sign an informed consent form, have good compliance, and cooperate with follow-up.

Exclusion Criteria

1. Subjects with a history of severe drug allergies or allergic tendencies.
2. Presence or suspicion of uncontrolled or treatment-required fungal,bacterial, viral, or other infections.
3. Subjects with central nervous system diseases caused by autoimmune diseases or non-autoimmune diseases (including epilepsy, psychosis, organic brain syndrome, cerebral vascular accidents, encephalitis, central nervous system vasculitis).
4. Subjects with insufficient cardiac function.
5. Subjects with congenital immunoglobulin deficiencies.
6. History of malignancy within five years.
7. Subjects with end-stage renal failure.
8. Subjects who are positive for hepatitis B surface antigen (HBsAg) or hepatitis B core antibody (HBcAb) with peripheral blood HBV DNA titer higher than the upper limit of detection; subjects positive for hepatitis C virus (HCV) antibody and peripheral blood HCV RNA; individuals positive for human immunodeficiency virus (HIV) antibody; individuals positive for syphilis testing.
9. Subjects with psychiatric disorders and severe cognitive impairments.
10. Subjects who had participated in other clinical trials within 3 months prior to enrollment.
11. Subjects who have used immunosuppressive agents or biologics with therapeutic effects on the disease within five half-life before enrollment
12. Pregnant women or women planning to conceive
13. Subjects that the investigator believes have other reasons that make them unsuitable for inclusion in this study.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
anti-CD19/BCMA CAR T-cells	UCAR T-cell group	Universal allogeneic CD19/BCMA CAR T-cells

Primary Outcome Measures

Name	Time	Method
The number and severity of dose-limiting toxicity (DLT) events	Within 28 Days After UCAR T-cell Infusion	DLT will be graded according to the NCI Common Terminology Criteria for Adverse Events (CTCAE) Version 5.0, and the ASTCT Consensus Grading for Cytokine Release Syndrome and Neurologic Toxicity Associated with Immune Effector Cells.
Changes of Myasthenia Gravis Activities if Daily Living (MG-ADL) Score	Up to 24 Months After UCAR T-cell Infusion	MG-ADL scale assesses the impact of gMG on daily functions by measuring 8 signs or symptoms that are commonly affected in MG. Each item is measured on a 4-point scale, where a score of 0 represents normal function and a score of 3 represents the loss of ability to perform that function. Total scores range from 0 to 24 points, with a higher score showing more severe MG.
Quantitative Myasthenia Gravis Score (QMG)	Up to 24 Months After UCAR T-cell Infusion	The QMG score is a 13-item scale used to quantify disease severity in myasthenia gravis. The scale measures ocular, bulbar, respiratory, and limb function, grading each finding, and ranges from 0 (no myasthenic findings) to 39 (maximal myasthenic deficits).
The total number, incidence, and severity of AEs	Up to 90 days After UCAR T-cell Infusion

Trial Locations

Locations (1)

The first affiliated hospital of medical college of zhejiang university; 🇨🇳 Hangzhou, Zhejiang, China