Bone marrow function: absolute neutrophil count more than or equal to 1500 and platelet count more than or equal to 100,000 Renal function: creatinine less than or equal to 1.5 mg/dl Hepatic function: bilirubin less than or equal 1.5times upper limit of normal, SGOT and alkaline phosphatase less than or equal 2.5 times upper limit of normal range Patients must have signed an informed consent. Patients of childbearing potential must have a negative serum pregnancy test prior to study entry and be practicing an effective form of contraception.