PRIOR CONCURRENT THERAPY: Biologic therapy: No concurrent biologic therapy Chemotherapy: No prior carboplatin or cisplatin No prior chemotherapy for recurrent disease No other concurrent chemotherapy Endocrine therapy: No concurrent hormonal therapy (except oral contraceptives or treatment for osteoporosis) Radiotherapy: See Disease Characteristics At least 28 days since prior radiotherapy and recovered No concurrent radiotherapy Surgery: See Disease Characteristics At least 28 days since prior surgery and recovered