PRIOR CONCURRENT THERAPY: Biologic therapy: Concurrent cytokine therapy allowed Chemotherapy: No more than 1 prior chemotherapy course for ovarian or peritoneal cancer At least 10 years since prior adjuvant chemotherapy for breast cancer Endocrine therapy: At least 3 months since prior systemic corticosteroid or other immunosuppressive therapy Concurrent female hormonal replacement allowed Radiotherapy: No prior radiotherapy for ovarian or peritoneal cancer No prior radiotherapy to abdomen Surgery: Prior surgery allowed Other: No other concurrent investigational drugs