Inclusion Criteria:

1. Age 18 - <70 years.
2. Patients with lymphoid malignancies who do not qualify for treatment protocols of higher priority: 2.1) Primary refractory/recurrent Hodgkin's disease 2.2) Primary refractory/recurrent non-Hodgkin's lymphoma 2.3) Multiple myeloma beyond first remission or unresponsive to therapy, who do not qualify for higher priority melphalan-based protocols.
3. Adequate renal function, as defined by estimated serum creatinine clearance >/= 50 ml/min and/or serum creatinine </= 1.8 mg/dL.
4. Adequate hepatic function, as defined by SGOT and/or SGPT </= 3 x upper limit of normal; serum bilirubin and alkaline phosphatase </= 2 x upper limit of normal.
5. Adequate pulmonary function with FEV1, FVC and DLCO >/= 50% of expected corrected for hemoglobin or volume.
6. Adequate cardiac function with left ventricular ejection fraction >/= 40%. No uncontrolled arrhythmias or symptomatic cardiac disease.
7. Zubrod performance status <2.
8. Patient should be willing to participate in the study by providing written consent.
9. Negative Beta HCG text in a woman with child-bearing potential, defined as not post-menopausal for 12 months or no previous surgical sterilization

Exclusion Criteria:

1. Patients with grade >/= 3 non-hematologic toxicity from previous therapy that has not resolved to grade 1.
2. Patients with prior whole brain irradiation
3. Patients with active hepatitis B, either active carrier (HBsAg +) or viremic (HBV DNA >=10,000 copies/mL, or >= 2,000 IU/mL).
4. Evidence of either cirrhosis or stage 3-4 liver fibrosis in patients with chronic hepatitis C or positive hepatitis C serology.
5. Active infection requiring parenteral antibiotics.
6. HIV infection, unless the patient is receiving effective antiretroviral therapy with undetectable viral load and normal CD4 counts
7. Patients having received radiation therapy to head and neck (excluding eyes), and internal organs of chest, abdomen or pelvis in the month prior to enrollment.