PRIOR CONCURRENT THERAPY: Biologic therapy: Not specified Chemotherapy: No prior chemotherapy Endocrine therapy: See Disease Characteristics Radiotherapy: At least 24 hours since prior radiotherapy if no marked bone marrow suppression expected At least 6 weeks since prior radiotherapy to measurable lesion if evidence of progression Concurrent radiotherapy for bone pain control allowed Surgery: At least 3 weeks since prior surgery Other: At least 30 days or 5 half lives (whichever is longer) since prior investigational drug No other concurrent investigational drugs