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.
|Mucopolysaccharidosis II||Genetic: lymphocyte gene therapy||Phase 1 Phase 2|
|Study Design:||Primary Purpose: Treatment|
|Study Start Date:||October 1996|
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.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00004454
|United States, Minnesota|
|University of Minnesota Medical School|
|Minneapolis, Minnesota, United States, 55455|
|Study Chair:||Chester B. Whitley||University of Minnesota - Clinical and Translational Science Institute|