PRIOR CONCURRENT THERAPY: Biologic therapy: At least 4 weeks since prior immunotherapy and recovered Chemotherapy: At least 4 weeks since prior chemotherapy (6 weeks for mitomycin and nitrosoureas) and recovered Prior fluorouracil or cisplatin allowed Endocrine therapy: Not specified Radiotherapy: At least 4 weeks since prior radiotherapy and recovered Surgery: Recovered from prior surgery Other: At least 30 days since prior investigational drugs No concurrent antiretroviral therapy (HAART)