Inclusion Criteria:

• Patients with hormone refractory prostate cancer, refractory multiple myeloma, refractory bladder cancer, or malignant lymphoma;
• life expectancy of ≥6 months,
• Zubrod Performance Status of ≤2,
• adequate bone marrow function, renal function, liver function and pulmonary function;
• age ≥ 18 years;
• willing and able to give informed consent; and
• effective contraceptive use or non child-bearing potential.

Exclusion Criteria:

• 10% weight loss in the previous 3 months;
• active serious infection not controlled by antibiotics;
• initiation of bisphosphonates treatment within 30 days;
• participation in other research study within 30 days;
• uncontrolled brain metastasis,
• prior intrathecal chemotherapy or whole-brain radiotherapy,
• inability to comply with protocol or undergo specified tests;
• other active malignancy;
• optic neuritis, and
• routine use of diuretics (for initial phase of study only).