Ublituximab in Autoantibody Positive Immune Mediated Necrotizing Myopathy

NCT ID: NCT07103746

Last Updated: 2026-01-06

Basic Information

• Recruitment Status: NOT_YET_RECRUITING
• Clinical Phase: PHASE2
• Total Enrollment: 30 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2026-01-31
• Study Completion Date: 2030-06-30

Brief Summary

This is a multi-center, Phase 2 trial of ublituximab as first-line combination therapy in early, active autoantibody positive immune-mediated necrotizing myopathy.

The primary objective is to estimate the effect of ublituximab as first add-on combination therapy at 24 weeks compared to placebo in treating early, active autoantibody positive immune-mediated necrotizing myopathy using the validated 2016 American College of Rheumatology/ European League Against Rheumatism (ACR/EULAR) Myositis Response Criteria, as measured by the Total Improvement Score (TIS)

Conditions

Autoimmune Disorders

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: TRIPLE

Study Groups

Initial Ublituximab Active Group

Receives 150 mg Ublituximab at Day 0 and 450 mg Ublituximab at Week 2, followed by 450 mgs of Ublituximab at Weeks 24 and 48.

At Week 26, will receive a Placebo dose of 450 mg to maintain the blind.

Group Type: EXPERIMENTAL

Ublituximab

Intervention Type: DRUG

Initial dose includes 150 mg dose followed by 450 mg two weeks later; maintenance dose is 450 mg

Placebo for Ublituximab

Intervention Type: DRUG

0.9% sodium chloride injection

Initial Placebo of ublituximab Group

Receives 150 mg Placebo at Day 0 and 450 mg Placebo at Week 2. Receives 150 mg Ublituximab at Week 24 followed by 450 mg Ublituximab at Weeks 26 and 48.

Group Type: EXPERIMENTAL

Ublituximab

Intervention Type: DRUG

Initial dose includes 150 mg dose followed by 450 mg two weeks later; maintenance dose is 450 mg

Placebo for Ublituximab

Intervention Type: DRUG

0.9% sodium chloride injection

Interventions

Ublituximab

Initial dose includes 150 mg dose followed by 450 mg two weeks later; maintenance dose is 450 mg

Intervention Type: DRUG

Placebo for Ublituximab

0.9% sodium chloride injection

Intervention Type: DRUG

Other Intervention Names

BRIUMVI(TM)

Eligibility Criteria

Inclusion Criteria

1. Participant must be able to understand and provide informed consent.

2. Age 18 years or older at disease onset.

3. Definite or probable IIM per the 2017 EULAR/ACR classification criteria.

4. Diagnosis of IMNM, meeting the 2016 ENMC classification criteria and having either of the following antibodies:

1. Anti-SRP

2. Anti-HMGCR

5. Early disease as defined as onset of objective muscle weakness assessed by a physician and/or CK elevation attributed to IMNM within 1 year of the time of informed consent.

6. Muscle weakness as assessed by an MMT-8 score < 142 of 150 and CK > 1.5x ULN along with abnormality in at least 1 of the following 4 CSMs at screening:

1. PhGA ≥ 2 cm

2. PtGA ≥ 2 cm

3. Extramuscular global assessment ≥ 2 cm

4. HAQ-DI ≥ 0.25

7. Only one background immunosuppressant treatment for IMNM. Permitted background therapy includes:

a. Exactly one of the following with medication type stable for at least 12 weeks prior to randomization, and medication dose stable for at least 4 weeks prior to randomization: methotrexate up to 25 mg/weekly, mycophenolate mofetil up to 3000 mg/daily, mycophenolic acid up to 2160 mg/daily, azathioprine up to 2.5 mg/kg daily, tacrolimus up to 0.2 mg/kg daily, or cyclosporine up to 5 mg/kg daily.

8. Current therapy consisting of glucocorticoid ≤ 20 mg/day of prednisone. The dose must be stable for at least 4 weeks prior to randomization. Participants who stopped treatment with glucocorticoids are eligible if the last dose of the glucocorticoids was at least 4 weeks before the time of informed consent.

9. Female participants of childbearing potential and male participants with a partner of childbearing potential must agree to consistently and correctly use FDA approved highly effective methods of birth control, as shown in Appendix 1: Acceptable Contraception Methods for Females of Reproductive Potential, for the entire duration of the study and 6 months after last study drug infusion. Female participants of reproductive potential must have a negative pregnancy test at screening and at baseline.

15. Prior receipt of B-cell depleting agents such as rituximab, ocrelizumab, ofatumumab, or belimumab at any time.

16. Treatment of IMNM with IVIG or subcutaneous immunoglobulin (SCIG) within 12 weeks of randomization, or prior receipt of more than one cycle of IVIG at any time.

17. Participant has current or history (within 12 months of screening) of alcohol, drug, or medication abuse.

18. Participant is pregnant or lactating or intends to become pregnant during the study.

19. Use of any investigational drug within 24 weeks of the time of informed consent.

20. Past or current medical problems or findings from physical examination or laboratory testing that are not listed above, which, in the opinion of the investigator, may pose additional risks from participation in the study, may interfere with the participant's ability to comply with study requirements, or that may impact the quality or interpretation of the data obtained from the study.

Exclusion Criteria

1. End-stage myositis with end-organ involvement that poses additional risk to the participant or confounds the assessment of the participant in the study. Conditions include but are not limited to advanced symptomatic interstitial lung disease (e.g., Forced Vital Capacity (FVC) <60% and/or requiring oxygen therapy) or severe dysphagia.

2. Irreversible muscle involvement and/or severe atrophy that will pose additional risk to the participant or confound the assessment of the participant in the study. This includes Muscle Damage VAS ≥ 3 cm at screening, documented history of severe atrophy of multiple muscle groups (based on MRI), and/or wheelchair bound.

3. Uncontrolled interstitial lung disease or any other uncontrolled IIM manifestation that in the opinion of the investigator would be likely to require treatment with prohibited medication during the study.

4. Diagnosis of other inflammatory or noninflammatory myopathies, including antibody-negative IMNM, inclusion body myositis, overlap myositis, metabolic myopathies, muscular dystrophies or family history of muscular dystrophy, drug induced, cancer-associated myositis, or endocrine-based myositis (except statin induced anti-HMGCR associated IMNM).

5. Severe liver disease, such as signs of ascites or hepatic encephalopathy.

6. History of malignancy (excluding non-melanoma skin cancer) unless cured by adequate treatment, with no evidence of recurrence for ≥ 5 years before the first administration of the study drug.

7. Recent or ongoing bacterial, viral, or fungal infection requiring systemic treatment within 14 days of the time of informed consent.

8. Current suppressive therapy for any chronic infections including herpes simplex virus (HSV).

9. Infection with Mycobacterium tuberculosis (TB) as defined by any of the following:

1. Positive interferon gamma release assay (IGRA) performed at screening or within 12 weeks prior to the time of informed consent.

2. Indeterminate IGRAs must be repeated (with same or other IGRA per local policy) and shown to be negative. Alternatively, if the assay remains indeterminant, a participant must have a negative purified protein derivative (PPD) skin test. Finally, if the participant has had the Bacille Calmette-Guerin (BCG) vaccine or has some other condition complicating the interpretation of TB testing, consultation with infectious disease specialist must be obtained before randomization.

10. Medical history or serologic evidence at screening of chronic infections, including:

a. Human immunodeficiency virus (HIV) infection b. Hepatitis B virus (HBV) as indicated by surface antigen or hepatitis B core antibody positivity c. Hepatitis C virus (HCV) as indicated by anti-hepatitis C antibody positivity. If a participant is Hepatitis C antibody positive, they will be eligible to participate in the study if they have a negative viral load at Screening.

11. Known hypersensitivity reaction to ublituximab.

12. Received a live or live-attenuated vaccine < 4 weeks before the time of informed consent. Received any other type of vaccine < 2 weeks before the time of informed consent.

13. Any of the following laboratory tests at screening:

a. Hemoglobin < 10 g/dL b. Absolute white blood cell count < 3,000 cells/mm3 c. Platelet count < 100,000 cells/mm3 d. Absolute neutrophils < 1,500 cell/mm3 e. Peripheral B-cell < 5/µL f. IgG < 690 mg/dL g. Estimated GFR < 50 mL/min/1.73 m2

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Autoimmunity Centers of Excellence

OTHER

Sponsor Role: collaborator

TG Therapeutics

UNKNOWN

Sponsor Role: collaborator

Rho Federal Systems Division, Inc.

INDUSTRY

Sponsor Role: collaborator

National Institute of Allergy and Infectious Diseases (NIAID)

NIH

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Julie Paik, M.D., M.H.S.

Role: STUDY_CHAIR

Johns Hopkins Hospital: Division of Rheumatology

Locations

Johns Hopkins Hospital: Division of Rheumatology

Baltimore, Maryland, United States

University of Texas - Houston

Houston, Texas, United States

Countries

United States

Related Links

https://www.autoimmunitycenters.org/

Autoimmunity Centers of Excellence (ACE)

https://www.niaid.nih.gov/

National Institute of Allergy and Infectious Diseases (NIAID)

http://www.niaid.nih.gov/about/dait

Division of Allergy, Immunology, and Transplantation (DAIT)

Other Identifiers

DAIT AIM01

Identifier Type: -

Identifier Source: org_study_id