Inclusion Criteria

- INCLUSION CRITERIA:

1. All patients must have a histologic or cytologic diagnosis of T-cell LGL
leukemia as determined by the Laboratory of Pathology or Hematology at the
Clinical Center, National Institutes of Health

2. All patients must have hemocytopenias such as granulocyte count less than
1,200/ul, platelet count less than 100,000/ul or hemoglobin less than 10 g/dl,
or require hematopoietic support (transfusion or colony stimulating factors) to
maintain counts at these or higher levels.

3. Patients must have measurable or evaluable disease

4. Patients must have a creatinine of less than 2.0 mg/dl.

5. Omission of cytotoxic chemotherapy for 3 weeks prior to entry into the trial is
required. However, patients receiving stable corticosteroids will be eligible.

6. Age greater than 18 years

7. Karnofsky performance greater than 70%

8. Patients must have a life expectancy of greater than 3 months.

9. Patients must be able to understand and sign an Informed Consent form.

10. All female patients must use adequate contraception during participation in this
trial and for three months after completing therapy.

EXCLUSION CRITERIA:

1. Patients with uncontrolled hypertension

2. Pregnant and nursing patients are not eligible for the study as CSA crosses the
placenta. Based on clinical use, premature births and low birth weight were
consistently observed. Breast-feeding is contraindicated because CSA enters the blood
milk and may possibly be administered to the child.

3. Underlying immunodeficiency state including human immunodeficiency virus (HIV)
seropositivity.

4. Positive for antibodies to hepatitis C or positive for hepatitis B surface antigen,

5. Patients with serious intercurrent illnesses, concurrent hepatic, renal, cardiac,
neurologic, pulmonary, infectious or metabolic disease of such severity that it would
preclude the patients' ability to tolerate cyclosporine.

6. Patients who received cyclosporine for LGL leukemia previously and failed to respond.