PRIOR CONCURRENT THERAPY: Biologic therapy: See Disease Characteristics Prior biologic therapy allowed Chemotherapy: See Disease Characteristics No concurrent chemotherapy Endocrine therapy: No concurrent hormonal therapy Radiotherapy: Prior radiotherapy allowed No concurrent radiotherapy Surgery: Not specified Other: No concurrent investigational anticancer or anti-infective therapy No concurrent aminoglycosides, amphotericin B, or foscarnet Concurrent required supportive care allowed, including: Non-investigational antiretroviral and antiviral medications Medications for Mycobacterium avium intracellulare infection Medications for cytomegalovirus (CMV) infection or CMV infection prophylaxis infection Medications for cytomegalovirus (CMV) infection or CMV infection prophylaxis