6. Patients must have adequate: Bone Marrow Function: Absolute neutrophil count (ANC) greater than or equal to 1,500/mcl. Platelets greater than or equal to 100,000/mcl. Hemoglobin greater than or equal to 9 g/dL. Blood coagulation parameters: PT such that the international normalized ratio (INR) is less than or equal to 1.2 x ULN (institutional upper limit of normal) (or an in-range INR, usually between 2 and 3, if a patient is on a stable dose of therapeutic warfarin) and a PTT less than or equal to 1.2 x ULN. Subjects receiving anticoagulant therapy are eligible if their INR is stable and PT/PTT therapeutic and within the recommended range for the desired level of anticoagulation. Hepatic function: Bilirubin less than or equal to 1.5 x ULN AST and ALT less than or equal to 2.5 x ULN and alkaline phosphatase less than or equal to 2.5 x ULN. Renal function: Creatinine less than or equal to 1.5 x ULN.