Study of Ezatiostat (Telintra Tablets) for Treatment of Severe Chronic Neutropenia

Inclusion Criteria: * Confirmed Idiopathic Severe Chronic Neutropenia * ECOG performance status of 0-2 * Adequate liver and renal function * Adequate Red Blood Cell and Platelet counts Exclusion Criteria: * Prior treatment of SCN * Non-Idiopathic types of SCN, ie. cyclic, congenital * History of chromosomal abnormalities, myelodysplasia, hematologic malignancy, aplastic anemia, systemic lupus erythematosus, rheumatoid arthritis (Felty's syndrome), or other collagen diseases, and drug-induced neutropenia, autoimmune neutropenia * Use of granulocyte colony stimulating factors (G-CSF), glucocorticoids, gamma globulin, lithium or investigational drug(s) within one month of enrollment * History of bone marrow transplantation or stem cell support