Encephalitis Clinical Trial
— ExTINGUISHOfficial title:
A Phase-2b, Double-Blind, Randomized Controlled Trial to Evaluate the Activity and Safety of Inebilizumab in Anti-Nmda Receptor Encephalitis and Assess Markers of Disease
Determine the difference in the modified Rankin score at 16 weeks in participants with anti-N-methyl-D-aspartate receptor (NMDAR) encephalitis treated with "first-line" immunomodulatory therapies provided as standard-of-care, and either inebilizumab (investigational agent) or placebo.
Status | Recruiting |
Enrollment | 116 |
Est. completion date | August 31, 2026 |
Est. primary completion date | October 31, 2025 |
Accepts healthy volunteers | No |
Gender | All |
Age group | 18 Years and older |
Eligibility | Inclusion Criteria: - Inclusion Criteria 1. Diagnosis of NMDAR encephalitis, defined by both (a) and (b): 1. A subacute onset of change in mental status consistent with autoimmune encephalitis, 2. A positive cell-based assay for anti-NMDA receptor IgG antibody in the CSF confirmed in study-specified laboratories. 2. Age = 18 years 3. Written informed consent and any locally required authorization (e.g., Health Insurance Portability and Accountability Act [HIPAA] in the United States of America (USA), European Union [EU] Data Privacy Directive in the EU) obtained from the participant/legal representative prior to performing any protocol-related procedures, including screening evaluations. 4. Females of childbearing potential who are sexually active with a nonsterilized male partner must agree to use a highly effective method of contraception beginning at screening or upon discharge from hospitalization/inpatient rehabilitation (for participants who were incapacitated at the time of screening), and to continue precautions for 6 months after the final dose of investigational product. 5. Nonsterilized males who are sexually active with a female partner of childbearing potential must agree to use a highly effective method of contraception at screening or upon discharge from hospitalization/inpatient rehabilitation (for participants who were incapacitated at the time of screening), and to continue precautions for 3 months after the final dose of investigational product. Male patients with female partners of childbearing potential must have that female partner use at least one form of highly effective contraception, starting at least one menstrual cycle before (the male patient's) first study drug administration and continuing until at least 3 months after their male partner's last dose of the study drug. 6. Willing to forego other immunomodulatory therapies (investigational or otherwise) for NMDAR encephalitis during the study. 7. Patient must have received at least 3 days of methylprednisolone 1000 mg IV or equivalent corticosteroid within 30 days prior to randomization (Day 1). In addition, patients must have received EITHER of the following treatments within 30 days before randomization. 1. IVIg, at a minimum dose of 2 g/kg 2. Plasma exchange or plasmapheresis, with a minimum of 5 treatments. NOTE: These treatments may be provided during the screening period, but must be completed prior to randomization. 8. mRS of =3 at the screening visit, indicating at least moderate disability. 9. Ability and willingness to attend study visits and complete the study Exclusion Criteria: 1. Any condition that, in the opinion of the investigator, would interfere with the evaluation or administration of the investigational product, interpretation of participant safety or study results, or would make participation in the study an unacceptable risk. This specifically includes recent history (last 5 years) of herpes simplex virus encephalitis or known central nervous system demyelinating disease (e.g., multiple sclerosis). 2. Presence of an active or chronic infection that is serious in the opinion of the investigator. 3. Concurrent/previous enrollment in another clinical study involving an investigational treatment within 4 weeks or 5 published half-lives of the investigational treatment, whichever is the longer, prior to randomization. 4. Lactating or pregnant females, or females who intend to become pregnant anytime from study enrollment to 6 months following last dose of investigational agent. 5. Known history of allergy or reaction to any component of the investigational agent formulation or history of anaphylaxis following any biologic therapy. 6. At screening (one repeat test may be conducted to confirm results prior to randomization within the same screening period), any of the following: 1. Aspartate transaminase (AST) > 2.5 × upper limit of normal (ULN) 2. Alanine transaminase (ALT) > 2.5 × upper limit of normal (ULN) 3. Total bilirubin > 1.5 × ULN (unless due to Gilbert's syndrome) 4. Platelet count < 75,000/µL (or < 75 × 109/L) 5. Hemoglobin < 8 g/dL (or < 80 g/L) 6. Total white blood count <2,500 cells/mm3 7. Total immunoglobulin < 600 mg/dL 8. Absolute neutrophil count < 1200 cells/µL 9. CD4 T lymphocyte count < 300 cells/µL 7. Receipt of the following at any time prior to randomization: 1. Alemtuzumab 2. Total lymphoid irradiation 3. Bone marrow transplant 4. T-cell vaccination therapy 8. Receipt of rituximab or any experimental B-cell depleting agent, unless the CD19 B-cell level has returned to above the lower limit of normal prior to randomization. 9. Receipt of any of the following within 3 months prior to randomization 1. Natalizumab (Tysabri®) 2. Cyclosporine 3. Methotrexate 4. Mitoxantrone 5. Cyclophosphamide 6. Azathioprine 7. Mycophenolate mofetil 10. Severe drug allergic history or anaphylaxis to two or more food products or medicines (including known sensitivity to acetaminophen/paracetamol, diphenhydramine or equivalent antihistamine, and methylprednisolone or equivalent glucocorticoid). 11. Known history of a primary immunodeficiency (congenital or acquired) or an underlying condition such as human immunodeficiency virus (HIV) infection or splenectomy that predisposes the participant to infection. 13. Confirmed positive test for hepatitis B serology (hepatitis B surface antigen and core antigen) and/or hepatitis C PCR positive at screening. 14. History of cancer, apart from ovarian or extra-ovarian teratoma (also known as a dermoid cyst) or germ cell tumor, or squamous cell carcinoma of the skin or basal cell carcinoma of the skin. Squamous cell and basal cell carcinomas should be treated with documented success of curative therapy > 3 months prior to randomization. 15. Any live or attenuated vaccine within 3 weeks prior to Day 1 (administration of killed vaccines is acceptable). 16. Bacillus of Calmette and Guérin (BCG) vaccine within 1 year of enrollment. 17. Recurrence of previously treated NMDAR encephalitis within the last 3 or 5 years, or suspicion of symptomatic untreated NMDAR encephalitis of greater than 3 months duration at the time of screening. |
Country | Name | City | State |
---|---|---|---|
Netherlands | Erasmus Medical University Center | Rotterdam | |
Spain | Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona | Barcelona | |
United States | University of Michigan Health System | Ann Arbor | Michigan |
United States | University of Alabama at Birmingham | Birmingham | Alabama |
United States | Massachusetts General Hospital | Boston | Massachusetts |
United States | SUNY Downstate | Brooklyn | New York |
United States | University of Virginia | Charlottesville | Virginia |
United States | Northwestern University Feinberg School of Medicine | Chicago | Illinois |
United States | University of Cincinnati | Cincinnati | Ohio |
United States | Ohio State University | Columbus | Ohio |
United States | University of Texas Southwestern Medical Center | Dallas | Texas |
United States | University of Iowa | Iowa City | Iowa |
United States | Mayo Clinic Jacksonville | Jacksonville | Florida |
United States | University of Miami | Miami | Florida |
United States | Vanderbilt University | Nashville | Tennessee |
United States | Yale University | New Haven | Connecticut |
United States | Columbia University Medical Center | New York | New York |
United States | Mount Sinai | New York | New York |
United States | UC Irvine | Orange | California |
United States | University of Pennsylvania | Philadelphia | Pennsylvania |
United States | St. Joseph Hospital and Medical Center Barrow Neurological Institute | Phoenix | Arizona |
United States | University of Pittsburgh | Pittsburgh | Pennsylvania |
United States | University of Rochester | Rochester | New York |
United States | UC Davis | Sacramento | California |
United States | Washington University in St. Louis School of Medicine | Saint Louis | Missouri |
United States | University of Utah | Salt Lake City | Utah |
United States | SUNY Buffalo | Williamsville | New York |
United States | Wake Forest University Health Sciences | Winston-Salem | North Carolina |
Lead Sponsor | Collaborator |
---|---|
University of Utah |
United States, Netherlands, Spain,
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* Note: There are 39 references in all — Click here to view all references
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Change of modified Rankin score at 16 weeks | Change in modified Rankin score (mRS) (0 to 6; 0=normal and 6=death) at 16 weeks determined by rank analyses, integrating need for rescue therapy and time to achievement of the mRS. | 16 weeks | |
Primary | Inebilizumab safety measures by the number of treatment-emergent adverse events and serious adverse events | Inebilizumab safety, as measured by the number of treatment-emergent adverse events (TEAEs) and treatment-emergent serious adverse events (TESAEs) | 96 weeks | |
Secondary | Time to mRS = 2, corrected for baseline value. | Time to mRS = 2, corrected for baseline value. | 96 weeks | |
Secondary | Clinical Assessment Scale in Autoimmune Encephalitis (CASE) Score (continuous logistic regression), corrected from baseline value to week 24 (weeks 6 and 16). | Clinical Assessment Scale in Autoimmune Encephalitis (CASE) Score (ranges of 0 to 27 with 0 being normal and 27 being worse)(continuous logistic regression), corrected from baseline value to week 24 (weeks 6 and 16). | 16 weeks | |
Secondary | mRS at week 6 as measured by proportional odds logistic regression/shift analysis. | mRS at week 6 as measured by proportional odds logistic regression/shift analysis. | 6 weeks | |
Secondary | Proportion of participants who meet the protocol-defined criteria for needing rescue therapy at week 6. | Proportion of participants who meet the protocol-defined criteria for needing rescue therapy at week 6. | 6 weeks | |
Secondary | Cognitive outcome at week 24 as measured by mean scaled score on the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) + components of Delis-Kaplan Executive Function System (D-KEFS). | Cognitive outcome at week 24 as measured by mean scaled score on the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) + components of Delis-Kaplan Executive Function System (D-KEFS). | 24 weeks | |
Secondary | Survival as measured by a Kaplan-Meier analysis. | Survival as measured by a Kaplan-Meier analysis. | 96 weeks |
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