Patients will be stratified according to whether or not they have received prior adjuvant chemotherapy. A two-stage design will be employed for patients with no prior chemotherapy: If less than or equal to 4 responses are seen among the initial 20 previously untreated patients, accrual will cease. If greater than or equal to 5 responses are seen in the initial 20 patients, however, accrual will be expanded to 40 patients.