PATIENT CHARACTERISTICS: Age: 18 and over Sex: Female Menopausal status: Not specified Performance status: ECOG 0-1 Life expectancy: At least 3 months Hematopoietic: WBC at least 3,000/mm3 Granulocyte count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 1.5 mg/dL AST or ALT no greater than 2.5 times upper limit of normal (ULN) Renal: Creatinine no greater than 1.5 times ULN Calcium no greater than 1.3 times ULN Other: Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception No history of other cancers except curatively treated carcinoma in situ of the cervix or nonmelanomatous skin cancer No active serious infection or other serious underlying medical condition that would preclude study therapy No dementia or significantly altered mental status that would preclude study consent No known hypersensitivity to fluorouracil-uracil or leucovorin calcium