Interleukin-12 in Treating Patients With Hematologic Cancers or Solid Tumors

DISEASE CHARACTERISTICS: Histologically proven hematologic malignancies or solid tumors Undergone high-dose chemotherapy or chemoradiotherapy with autologous bone marrow and/or peripheral blood stem cell transplantation Confirmation of complete remission is required for acute leukemia No significant CNS disease No clinically significant ascites or pleural effusions Hormone receptor status: Not specified PATIENT CHARACTERISTICS: Age: 18 and over Sex: Not specified Menopausal status: Not specified Performance status: ECOG 0-1 Life expectancy: Not specified Hematopoietic: Absolute neutrophil count at least 1,000/mm3 Hemoglobin at least 9 g/dL (transfusion allowed) Platelet count at least 50,000/mm3 (transfusion independent) No clinically significant coagulopathy (unless due to cancer and resolved) Hepatic: Bilirubin no greater than 2 mg/dL SGOT no greater than 2 times upper limit of normal No chronic or acute hepatitis Hepatitis B surface antigen negative Renal: Creatinine no greater than 2 mg/dL No symptomatic hypercalcemia Calcium less than 12 mg/dL Cardiovascular: No uncontrolled angina No arrhythmias requiring drug or device therapy No symptomatic congestive heart failure Pulmonary: No clinically significant pulmonary dysfunction Metabolic: No uncontrolled diabetes mellitus No untreated hyper or hypothyroidism No Cushing's disease Gastrointestinal: No clinically significant gastrointestinal hemorrhages No uncontrolled peptic ulcer disease No history of inflammatory bowel di…