PRIOR CONCURRENT THERAPY: Biologic therapy: No concurrent filgrastim (G-CSF), sargramostim (GM-CSF), or epoetin alfa No concurrent biologic therapy No concurrent immunotherapy Chemotherapy: No prior chemotherapy No other concurrent chemotherapy Endocrine therapy: At least 14 days of prior corticosteroids at a stable dose required Concurrent corticosteroids allowed Radiotherapy: No prior radiotherapy No concurrent stereotactic boost radiotherapy Surgery: See Disease Characteristics No concurrent surgery for tumor debulking Other: No other concurrent investigational drugs