Interleukin-2 in Metastatic Kidney Cancer

Inclusion Criteria: 1. Patients must have a histologic diagnosis of metastatic kidney cancer. Patients may have received prior systemic therapy or may be previously untreated 2. Patients must have bi-dimensional measurable disease on physical exam or radiologic studies. 3. ECOG performance status of 0 or 1 and estimated survival of at least 3 months. 4. White blood count of \> 3500/mm3, platelet count \> 100,000/mm3, hemoglobin \> 9.0 gm/dl; bilirubin, ALT, AST \< 3 x upper limit of normal; serum creatinine \< 2.0 mg/dl. 5. Patients must undergo a low-level cardiac stress test as a screen for possible atherosclerotic heart disease. Patients with a positive stress test would be excluded from this trial. 6. Patients with elevated temperatures \> 100.5 F must have sources of occult infection excluded. 7. Patients must be felt to have recovered from effects of prior therapy, such as \> 2 weeks after prior chemotherapy. 8. Patient consent must be obtained prior to entrance onto study. 9. Women of childbearing potential must have a negative pregnancy test and must take adequate precautions to prevent pregnancy during treatment Exclusion Criteria: 1. Medical illness requiring corticosteroids or other immunosuppressive agents (such as cyclosporin or methotrexate. 2. Autoimmune disease such as inflammatory arthritis which could be exacerbated by immune-based therapy. 3. Prior history of psychiatric disorder which could be exacerbated by interleukin-2. 4. Lactation or pregnancy. 5. Evidence of significant cardiovascular disease including history of recent (\< 6 months prior) myocardial infarction, congestive heart failure, primary cardiac arrhythmias (not due to electrolyte disorder or drug toxicity, for example) beyond occasional PVC's, angina, positive low-level stress test, or cerebrovascular accident. 6. Current brain metastasis.