Combination Chemotherapy, Total Body Irradiation, and Donor Blood Stem Cell Transplant in Treating Patients with Secondary Myelofibrosis

Inclusion Criteria

• Diagnosis of primary of secondary myelofibrosis with transplant indication by Dynamic International Prognostic Scoring System (DIPSS)-plus (> intermediate-1)
• Age 18-70; patients >= age 50 must have an AA-comorbidity score (HCT-CI) <4 (Sorror)
• Patients can be in chronic phase (CP) with bone marrow (BM) blast count =< 15% as long as no evidence of disease acceleration per principal investigator (PI) and treating physician’s opinion or after progression to acute myeloid leukemia (AML) and achieved =< 5% BM blasts (morphologic complete remission [CR] prior to transplant)
• Lack of an human leukocyte antigen (HLA) matched donor or need to proceed fast to transplantation when a patient does not have an immediately available matched unrelated donor (typed by high-resolution in the registry)
• Performance status >= 70% (Karnofsky); patients > 50 years should have adequate cognitive function; any concerns regarding cognitive function should be addressed by a geriatrician/neurologist
• Alanine aminotransferase (ALT)/aspartate aminotransferase (AST)/bilirubin =< 5 X upper limit of normal (ULN)
• Measured creatinine clearance > 60 mls/min
• Left ventricular ejection fraction (LVEF) >= 50%
• Corrected carbon monoxide diffusing capability (DLCOc) >= 50%
• No active infections
• Prior treatment with JAK2 inhibitor therapy is not excluded; a JAK2 inhibitor will need to be stopped 1-2 days prior to starting conditioning regimen
• DONOR: Documented informed consent per local, state and federal guidelines
• DONOR: Genotypically haploidentical as determined by HLA typing * Preferably a non-maternal HLA haploidentical relative due to data of high incidence of graft failure with use of maternal HLA haploidentical cells * Eligible donors include biological parents, siblings or half-siblings, children, or cousins in rare instances
• DONOR: Absence of pre-existing donor-specific anti-HLA antibodies (DSA) in the recipient; Patients with pre-existing DSA could undergo desensitization per City of Hope (COH) standard operating procedures [SOP] and should have DSA < MFI of 2000 prior to conditioning at discretion of PI
• DONOR: Infectious disease screening performed within 30 days prior to stem cell mobilization per federal guidelines and is: * Seronegative for HIV 1+2 antibody (Ab) and/or HIV polymerase chain reaction (PCR), human T-cell leukemia virus (HTLV) I/II Ab, hepatitis B virus surface antigen (HBsAg), hepatitis B virus surface antibody (HBcAb), hepatitis C virus (HCV) Ab * Negative rapid plasma reagin (RPR) for syphilis
• DONOR: Women of childbearing potential (WOCBP): Urine pregnancy testing performed within 7 days prior to stem cell mobilization
• DONOR: Is approved and completed evaluation prior to recipient initiation of the preparative regimen per institutional guidelines

Exclusion Criteria

• Evidence of severe portal hypertension with evidence of decompensation either with bleeding varices, large volume ascites, or hepatic encephalopathy
• In a bone marrow biopsy 4 weeks prior to start of conditioning on study: * > 15% bone marrow blasts at transplant if no history of AML and per PI and treating physician’s opinion of disease acceleration * > 5% if had previous progression to AML
• Human immunodeficiency virus (HIV) positive; active hepatitis B or C
• Patients with active infections; the PI is the final arbiter of the eligibility
• Patients with evidence of severe pulmonary hypertension by echocardiogram and confirmed by a subsequent right side cardiac catheterization pre-enrollment
• Liver cirrhosis
• Prior central nervous system (CNS) involvement by tumor cells
• History of another primary malignancy that has not been in remission for at least 3 years (the following are exempt from the 3-year limit: non-melanoma skin cancer, fully excised melanoma in situ [stage 0], curatively treated localized prostate cancer, and cervical or breast carcinoma in situ on biopsy or a squamous intraepithelial lesion on papanicolaou [PAP] smear)
• Positive beta human chorionic gonadotropin (HCG) test in a woman with child bearing potential defined as not post-menopausal for 12 months or no previous surgical sterilization
• Noncompliance - inability or unwillingness to comply with medical recommendations regarding therapy or follow-up, including smoking tobacco
• DONOR: Has undergone solid organ, stem cell, bone marrow or blood transplantation
• DONOR: Receiving any investigational agents, or concurrent biological, chemotherapy, immunosuppression or radiation therapy
• DONOR: Active infection
• DONOR: Thrombocytopenia < 150,000 cells /mm^3 at baseline evaluation
• DONOR: Sero-positive for HIV-1 & 2 antibody, HTLV-I & II antibody, hepatitis B virus (HBV) and HCV
• DONOR: Medical or physical reason which makes the donor unlikely to tolerate or cooperate with growth factor therapy and leukapheresis
• DONOR: Factors which place the donor at increased risk for complications from leukapheresis or G-CSF therapy
• DONOR: WOCBP: Pregnant or =< 6 months breastfeeding