PRIOR CONCURRENT THERAPY: Biologic therapy: No concurrent biologic therapy Chemotherapy: No prior vinca alkaloid No other concurrent chemotherapy Endocrine therapy: No concurrent hormone therapy No concurrent corticosteroids (topical or inhaled corticosteroids allowed) Radiotherapy: At least 4 weeks since prior radiotherapy Less than 25% of bone marrow irradiated No concurrent radiotherapy Surgery: At least 3 weeks since prior surgery Other: No other concurrent investigational drugs