PRIOR CONCURRENT THERAPY: Biologic therapy: Prior vaccine therapy allowed No prior immunotherapy, interferon, interleukins, levamisole, or other biologic response modifiers Chemotherapy: No prior chemotherapy, including infusion or perfusion therapy Endocrine therapy: No concurrent systemic corticosteroids Radiotherapy: No prior radiotherapy to the proposed site(s) of study Surgery: See Disease Characteristics Other: No other medication or treatment regimen that would preclude study No concurrent immunosuppressive therapy