Investigating Mechanism of Action of DAC HYP in the Treatment of High-Inflammatory Multiple Sclerosis (MS)

Sponsored by National Institutes of Health Clinical Center (CC)

Phase Quota
Phase 1

Objective: The primary goal of this study is to investigate the mechanism of action (MOA) of CD25-blocking therapies in high inflammatory multiple sclerosis (HI-MS). The secondary goal of this study is to assess long-term safety and efficacy of CD25-blocking therapies in HI-MS. Study population: Two cohorts of patients will be enrolled: - Long-term daclizumab therapy cohort: Up to 15 daclizumab-treated patients with relapsing-remitting (RR-MS) or secondary-progressive MS (SP-MS) previously classified as HI-MS based on MRI/clinical criteria, who have been treated with IV daclizumab for a minimum of 1 year and responded to this therapy with significant (> 70%) decrease in contrast-enhancing lesions (CEL) or stabilization/improvement of disease activity (> 60% decrease in MS relapses and stable or improved EDSS disability score). - New treatment cohort: Up to 15 HI-MS patients (RR- or SP-MS) with inadequate therapeutic response to first-line, FDA-approved immunomodulatory therapies for MS or who cannot, for any reason, be treated with first-line, FDA-approved immunomodulatory therapies for MS. Design: This is an open label, Phase I trial of 150 mg of daclizumab high yield process (DAC HYP) administered subcutaneously (SC) every 4 weeks for a total of 3 years. Outcome measures: Because the main goal of this study is to investigate the MOA of CD25-blocking therapies in MS, the primary outcomes are mechanistic immunological studies performed on clinical samples (peripheral blood mononuclear cells (PBMC), cerebrospinal fluid (CSF) cells and skin biopsies) derived from DAC HYP-treated patients. The secondary outcome measure is long-term safety and tolerability of subcutaneous DAC HYP in HI-MS patients.

Study Start Date: May 2010

Estimated Completion Date: July 2017

Specialties: Internal Medicine: Neurology Nursing: Neurology Neurology: Demyelinating Disorders Physician Assistant: Neurology


  • Biological: DAC-HYP

Inclusion criteria

  • MS as defined by the modified McDonald criteria (Polman, Reingold et al. 2005)
  • HI-MS (RR-MS or SP-MS) before initiation of daclizumab therapy, defined as:
    • Greater than or equal to 3 CEL on a single pre-daclizumab MRI or
    • Greater than or equal to 1 MS exacerbation per year before initiation of daclizumab therapy or
    • Progression of sustained disability by greater than or equal to 1.0 point on the expanded disability status scale (EDSS) in the year preceding daclizumab therapy
    • Age 18-60, inclusive
    • EDSS 0 to 6.0, inclusive
    • Able to provide informed consent
    • Willing to participate in all aspects of trial design and follow-up
    • Willing to commit to the use of a reliable method of birth control (i.e., hormonal contraception including birth control pills, injected hormones or vaginal ring; intrauterine device; barrier methods with spermicide, specifically diaphragms or condoms; or surgical sterilization, such as hysterectomy, tubal ligation, or vasectomy in a partner) for the duration of the study and continued 4 months after conclusion of the study


  • IV daclizumab therapy for at least 1 year with a treatment response consisting of:
    • Greater than or equal to 70% reduction of CEL after starting daclizumab; or
    • Stabilization or improvement of sustained neurological disability on daclizumab

Exclusion criteria

  • PP-MS or low-inflammatory SP-MS
  • Alternative diagnoses that can explain neurological disability and MRI findings (e.g., ischemia/gliosis, CNS lyme disease, SLE, sarcoidosis, etc.)
  • History of malignancy, with the following exceptions: excised or treated basal cell carcinoma or fewer than 3 squamous cell carcinomas, grade 1 endometrial carcinomas treated with total hysterectomy and without evidence for recurrence for greater than or equal to 3 years
  • Clinically significant medical disorders that, in the judgment of the investigators, could cause CNS tissue damage or limit its repair, expose the patient to undue risk of harm or prevent the patient from completing the study (e.g., immunodeficiency disorders, other autoimmune or immune-mediated disorders or chronic infections). Specific exclusions (based on baseline laboratory evaluation) are:
    • Positive HIV or HTLV-1 serology
    • Positive hepatitis B or C serology
    • Pregnant or breastfeeding female
    • Known history of severe allergic or anaphylactic reactions
    • Known hypersensitivity to study drug or its excipients
    • Varicella or herpes zoster virus infection or any severe viral infection within the 6 weeks prior to screening; or
    • Exposure to varicella zoster virus within 21 days before screening
  • Abnormal screening/baseline blood tests exceeding any of the limits defined below:
    • Serum alanine aminotransferase/serum glutamate pyruvate transaminase (ALT/SGPT), aspartate aminotransferase/serum glutamic oxaloacetic transaminase (AST/SGOT), or gamma-glutamyl-transferase greater than or equal to 2 times the upper limit of normal (ULN)
    • Total white blood cell count < 3,000/mm(3)
    • Hemoglobin greater than or equal to 9.0 g/dL
    • Platelets greater than or equal to 100 x 10(9)/L
    • Lymphocytes greater than or equal to 1.0 x 10(9)/L
    • Neutrophils greater than or equal to 1.5 x 10(9)/L
    • Serum creatinine greater than or equal to the ULN
  • Any of the following treatment history:
    • Any type of live virus vaccine in the 4 weeks prior to initiation of therapy, including but not limited to: measles/mumps/rubella vaccine, varicella zoster virus vaccine, oral polio vaccine, and nasal influenza vaccine
    • Infection (viral, fungal, bacterial) requiring hospitalization or intravenous (IV) antibiotics within the 8 weeks prior to initiation of therapy
    • Another investigational drug or approved therapy for investigational use (except daclizumab) within the 6 months prior to initiation of therapy
  • Prior treatment with the any of the following:
    • Total lymphoid irradiation
    • Cladribine
    • T cell or T cell receptor vaccination; or
    • Any therapeutic monoclonal antibody, except natalizumab and daclizumab
  • Prior treatment with any of the following medications or procedures within 1 year prior to initiation of therapy:
    • Mitoxantrone
    • Cyclophosphamide
    • Fingolimod; or
    • Natalizumab
  • Prior treatment with any of the following medications or procedures within 6 months prior to initiation of therapy:
    • Cyclosporine
    • Azathioprine
    • Methotrexate
    • Mycophenolate mofetil
    • Intravenous immunoglobulin (IVIg); or
    • Plasmapheresis or cytapheresis
  • Treatment with any of the following medications within the 30 days prior to initiation of therapy:
    • IV corticosteroid treatment
    • Oral corticosteroid treatment
    • Glatiramer acetate; or
    • Interferon-beta
  • For immunizations studies, known history of hypersensitivity or severe allergic reaction to vaccine components (subjects with such history can participate in the trial, but will not be immunized)
  • For patients in the extension phase: Patients may be excluded if they did not demonstrate an adequate clinical response in the first phase of the trial while receiving DAC HYP

Study Locations And Contact Information

  • National Institutes of Health Clinical Center 9000 Rockville Pike, Bethesda Maryland

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