OBJECTIVES: I. Transfer the human glucocerebrosidase (GC) gene into peripheral blood stem
cells (PBSC) obtained from patients with type I Gaucher disease using a retroviral vector.
II. Transplant the autologous transduced PBSC in these patients. III. Measure the carriage
and expression of the transferred gene and its duration in peripheral blood leukocytes.
IV. Assess the clinical effects of transplanting genetically corrected PBSC.
PROTOCOL OUTLINE: Patients undergo autologous transplantation using peripheral blood stems
cells (PBSC) stimulated with filgrastim (G-CSF) and transduced with a retroviral vector
containing the human glucocerebrosidase gene (R-GC). Patients may receive up to 4
transplants if a deficient glucocerebrosidase level is found in peripheral leukocytes 1
month following transplantation.
The G-CSF-stimulated PBSC are enriched for CD34-positive stem cells and transduced with the
R-GC vector. Stem cells with normal gene activity are selected for transplantation.
Patients are followed every month for 6 months, every 6 months for 18 months, and then
PROTOCOL ENTRY CRITERIA:
--Disease Characteristics-- Enzyme proven type I Gaucher disease Glucocerebrosidase (GC)
activity less than 30% of normal GC mutation identified Significant signs and symptoms of
disease prior to therapy initiation At least 1 of the following after 12 months of
therapy: Liver at least 2 times normal size Spleen at least 5 times normal size Platelet
count greater than 150,000/mm3 Clinical bone disease with pain, fractures, or infarctions
Multiple sites of marrow involvement Angiotensin-converting enzyme at least 1.5 times
normal No GC antibody At least 3 of the following responses to therapy: Hemoglobin
increase of 2 g/dL Platelet count increase of 50% Spleen or liver size decrease at least
25% Improvement in MRI or x-ray of the bones Nontartrate inhibitable acid phosphatase
decrease of 50% Angiotensin-converting enzyme decrease of 50% OR Previously untreated and
immediate enzyme therapy would not be life saving Meets at least 2 of the following
criteria: Spleen at least 5 times normal size or liver at least 2 times normal size by
physical exam and MRI Hemoglobin less than 11 g/dL Platelet count less than 90,000/mm3
Disabling bone pain with degenerative changes on x-ray Multiple sites of bone marrow
infiltration and evidence of bony changes Pulmonary compromise with clubbing and PaO2 less
than 70 mm Hg Biopsy proven cirrhosis and elevated hepatic parenchymal enzymes Bleeding
esophageal varices --Prior/Concurrent Therapy-- At least 3 months since any prior
investigational therapy Concurrent enzyme replacement therapy may be tapered on study
--Patient Characteristics-- HIV negative No malignant disease No known sensitivity to egg
or murine products Not pregnant or nursing Fertile patients must use effective