Post-Transplant Bortezomib and High Dose Cyclophosphamide as Graft-Versus-Host Disease (GVHD) Prophylaxis

Inclusion Criteria 1. 8 out of 8 matched related or unrelated donor 2. Age \> 18 years 3. Good performance status with a Karnofsky score \>/= to 70% 4. No evidence of progressive bacterial, viral or fungal infection despite adequate treatment 5. Creatinine clearance \> 40 mL/min/1.72m2 6. Total bilirubin \< 1.5 and ALT and AST \< 2 times the upper limit of normal 7. Cardiac ejection fraction \> 40% 8. DLCO \> 50% 9. Negative pregnancy test 10. Negative HIV serology 11. Able to provide informed consent 12. Female subject is either postmenopausal for at least 1 year before the screening visit, is surgically sterilized or if they are of childbearing potential, agree to practice 2 effective methods of contraception from the time of signing the informed consent form through 30 days after the last dose of bortezomib, or agree to completely abstain from heterosexual intercourse. 13. Male subjects, even if surgically sterilized (ie, status postvasectomy) must agree to 1 of the following: practice effective barrier contraception during the entire study treatment period and through a minimum of 30 days after the last dose of study drug, or completely abstain from heterosexual intercourse. Exclusion Criteria: 1. Age \<18 years 2. Poor performance status (\<70%) 3. Active infections 4. Abnormal creatinine clearance \<40ml/min 5. Elevated bilirubin \>1.5 and ALT and AST .2 times the upper limit of normal 6. Poor ejection fraction \<40% 7. DLCO \<50% 8. Pregnant female. 9. HIV positive 10. Inability to provide informed consent 11. Patient has \>/= Grade 2 peripheral neuropathy 12. Patient had myocardial infarction within 6 months prior to enrollment or has New York Heart Association (NYHA) Class III or IV heart failure, uncontrolled angina, severe uncontrolled ventricular arrhythmias, or electrocardiographic evidence of acute ischemia or active conduction system abnormalities. Prior to study entry, any ECG abnormality at screening must be documented by the investigator as not medically relevant. 13. Patient has hypersensitivity to bortezomib, boron, or mannitol. 14. Serious medical or psychiatric illness likely to interfere with participation in this clinical study. 15. Diagnosed or treated for another malignancy within 3 years of enrollment, with the exception of complete resection of basal cell carcinoma or squamous cell carcinoma of the skin, an in situ malignancy, or low-risk prostate cancer after curative therapy. 16. Participation in clinical trials with other investigational agents not included in this trial, within 14 days of the start of this trial and throughout the duration of this trial.