PRIOR CONCURRENT THERAPY: Biologic therapy: See Disease Characteristics Chemotherapy: See Disease Characteristics At least 4 weeks since prior chemotherapy Endocrine therapy: See Disease Characteristics Radiotherapy: See Disease Characteristics No prior radiotherapy to at least 30% of bone marrow At least 4 weeks since prior radiotherapy Surgery: See Disease Characteristics Other: No other concurrent investigational agents No other concurrent anticancer therapy No HIV positive patients receiving antiretroviral therapy (HAART)