- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00004454
Phase I/II Study of Retroviral-Mediated Transfer of Iduronate-2-Sulfatase Gene Into Lymphocytes of Patients With Mucopolysaccharidosis II (Mild Hunter Syndrome)
OBJECTIVES: I. Evaluate the safety and feasibility of treating mucopolysaccharidosis II (mild Hunter syndrome) by lymphocyte gene therapy.
II. Determine the levels of iduronate-2-sulfatase enzyme in these patients attained by infusing increasing doses of lymphocytes transduced with a retroviral vector designed for insertion and expression of this iduronate-2-sulfatase gene (L2SN).
III. Determine the duration of survival of these transduced cells in these patients.
IV. Determine whether monthly infusion of L2SN-transduced lymphocytes accomplishes metabolic correction (as measured by glycosaminoglycan excretion), decrease in liver or spleen volume, any therapeutic effect upon cardiac and pulmonary dysfunction, or any other effects from treatment.
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
PROTOCOL OUTLINE: Peripheral blood lymphocytes are harvested from patient by apheresis, stimulated to initiate the growth of T-lymphocytes, transduced with retrovirus L2SN containing iduronate-2-sulfatase, and reinfused into the patient.
Patients receive 12 monthly infusions of these retroviral-mediated gene transduced lymphocytes with the first three infusions in a dose escalation format.
Patients are monitored for at least 2 hours after completion of each infusion. Patients are followed at 1 year after treatment, and then until death.
Study Type
Enrollment
Phase
- Phase 2
- Phase 1
Contacts and Locations
Study Locations
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Minnesota
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Minneapolis, Minnesota, United States, 55455
- University of Minnesota Medical School
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
PROTOCOL ENTRY CRITERIA:
--Disease Characteristics--
Mucopolysaccharidosis II (mild Hunter syndrome) as defined by the following:
- Characteristic coarse facial features, hepatosplenomegaly, and radiographic evidence of dysostosis multiplex
- Elevated urinary excretion of glycosaminoglycans in 3 urine specimens
- Deficient iduronate-2-sulfatase enzyme activity as measured in plasma and leukocytes
- Mutation consistent with mild Hunter syndrome must have either: A single base substitution of the coding sequence not previously associated with severe Hunter syndrome phenotype OR An exon-skipping mutation that would allow for occasional production of (minimal amounts of) normal protein
--Patient Characteristics--
Cardiovascular: No severe cardiac disease
Pulmonary: No severe respiratory disease
Other:
- Must have IQ score of 80 or higher
- Effective contraception required of all fertile patients
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
Collaborators and Investigators
Collaborators
Investigators
- Study Chair: Chester B. Whitley, University of Minnesota
Study record dates
Study Major Dates
Study Start
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
- Metabolic Diseases
- Nervous System Diseases
- Neurologic Manifestations
- Neurobehavioral Manifestations
- Genetic Diseases, Inborn
- Genetic Diseases, X-Linked
- Connective Tissue Diseases
- Carbohydrate Metabolism, Inborn Errors
- Metabolism, Inborn Errors
- Lysosomal Storage Diseases
- Mucinoses
- Mental Retardation, X-Linked
- Intellectual Disability
- Heredodegenerative Disorders, Nervous System
- Mucopolysaccharidosis II
- Mucopolysaccharidoses
Other Study ID Numbers
- 199/13577
- UMN-HUNTER
- UMN-5P01HD32652
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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