Peritransplant Ruxolitinib for Patients With Primary and Secondary Myelofibrosis

  • End date
    Dec 31, 2028
  • participants needed
  • sponsor
    Fred Hutchinson Cancer Center
Updated on 14 July 2022
stem cell transplantation
graft versus host disease
total body irradiation
mycophenolate mofetil
carbon monoxide
secondary myelofibrosis


This phase II trial studies how well administering ruxolitinib before, during, and after allogeneic hematopoietic stem cell transplantation works in preventing graft versus host disease and improving transplant outcomes in patients with primary and secondary myelofibrosis. Donor hematopoietic stem cell transplantation (HSCT) is currently the only treatment with proven curative potential for myelofibrosis, however, myelofibrosis patients have a high risk for developing graft versus host disease post-transplant. Graft versus host disease is a condition where the transplanted cells from a donor can attack the body's normal cells. Ruxolitinib, a janus-associated kinase (JAK) inhibitor, is known to decrease inflammatory signals, which may reduce spleen size and decrease symptoms such as night sweats and weight loss. Administering ruxolitinib before, during, and after transplant may decrease the incidence and severity of graft versus host disease, increase survival, and improve quality of life in patients with primary and secondary myelofibrosis.



PART 1: Patients receive ruxolitinib orally (PO) starting 8 weeks prior to hematopoietic stem cell transplantation (HSCT) and continuing until approximately 14 days prior to conditioning regimen, then tapered per the treating clinician until day -4 in the absence of disease progression or unacceptable toxicity. Patients who join a different research study for Part 2 have their collected data and samples from Part 1 carried over to the new protocol.

PART 2: Patients are assigned to either a high (myeloablative) or reduced intensity conditioning regimens per the clinical provider together with the Clinical Coordinators Office (CCO):

MYELOABLATIVE CONDITIONING: Patients receive cyclophosphamide intravenously (IV) on days -7 and -6 and busulfan IV over 3 hours on days -5 to -2. Patients with umbilical cord blood (UCB) as their transplant source also receive fludarabine IV over 30 minutes on days -8 to -6. Treatment continues in the absence of disease progression or unacceptable toxicity.

REDUCED INTENSITY CONDITIONING: Patients receive fludarabine IV over 30 minutes on days -6 to -2 and melphalan IV over 15-30 minutes on days -3 and -2. Patients with UCB as their transplant source also undergo total body irradiation (TBI) on day -1. Treatment continues in the absence of disease progression or unacceptable toxicity.

TRANSPLANT: After completion of conditioning regimen, patients undergo HSCT on day 0.

GVHD PROPHYLAXIS: Patients receive ruxolitinib until approximately 7 months post-transplant and then tapered over 2 months until 9 months post HSCT. Patients also receive tacrolimus IV continuously (inpatients) or every 12 hours (outpatients) beginning day -1 (day -3 for patients with UCB as their donor source), then PO twice daily (BID) once therapeutic levels are reached, with a taper beginning on day 56 for patients with related donors, and day 100 for patients with unrelated donors over 4 months in the absence of GVHD. The duration of tacrolimus for patients with GVHD is determined by the attending physician. Patients with related and unrelated donors also receive methotrexate IV on days 1, 3, 6, and 11. Patients with UCB as their transplant source also receive mycophenolate mofetil IV or PO every 8 hours beginning on days 0-30, then tapered until day 40 in the absence of GVHD. All treatment continues in the absence of disease progression or unacceptable toxicity.

Patients are followed up at 6 months, 1 year, and 2-5 years after completion of HSCT.

Condition Primary Myelofibrosis, Secondary Myelofibrosis
Treatment cyclophosphamide, methotrexate, mycophenolate mofetil, busulfan, melphalan, allogeneic hematopoietic stem cell transplantation, Fludarabine, Tacrolimus, Total-Body Irradiation, Ruxolitinib
Clinical Study IdentifierNCT04384692
SponsorFred Hutchinson Cancer Center
Last Modified on14 July 2022


Yes No Not Sure

Inclusion Criteria

Disease criteria
Diagnosis of primary myelofibrosis (PMF) as defined by the 2016 World Health Organization classification system or diagnosis of secondary myelofibrosis (MF) as defined by the International Working Group (IWG) for Myeloproliferative Neoplasms Research and Treatment criteria
Patients meeting the criteria for intermediate-1, intermediate-2 or high-risk disease by Dynamic International Prognostic Scoring System (DIPSS) or DIPSS plus
Ability to understand and the willingness to sign a written informed consent document
Patient must be a potential hematopoietic stem cell transplant candidate as assessed by the consenting physician
Patient must be willing to start ruxolitinib within a 6-month time period
Meeting criteria for part 1, as above, at time of initiation of ruxolitinib, including the ability to understand and willingness to sign a written informed consent. Patients arriving to our institution for transplant and not enrolled in part 1 may still be enrolled in part 2 if part 1 criteria are met. These patients will have part 1 endpoints transcribed from medical records
Received ruxolitinib for at least 8 weeks immediately prior to conditioning and be willing to continue until 9 months post-transplant as tolerated
Performance status score: Karnofsky >= 70
Calculated creatinine clearance using the Cockcroft-Gault formula or 24 hour (hr) urine creatinine clearance must be > 60 ml/min
Total serum bilirubin must be < 3 mg/dL unless the elevation is thought to be due to Gilbert's disease or hemolysis
Transaminases must be < 3 x the upper limit of normal
Patients with clinical or laboratory evidence of liver disease will be evaluated for the cause of liver disease, its clinical severity in terms of liver function, and the degree of portal hypertension. Patients with fulminant liver failure, cirrhosis with evidence of portal hypertension or bridging fibrosis, alcoholic hepatitis, hepatic encephalopathy, or correctable hepatic synthetic dysfunction evidenced by prolongation of the prothrombin time, ascites related to portal hypertension, bacterial or fungal abscess, biliary obstruction, chronic viral hepatitis with total serum bilirubin > 3mg/dL, and symptomatic biliary disease will be excluded
Diffusion capacity of lung for carbon monoxide (DLCO) corrected > 60% normal. May be not be on supplemental oxygen
Left ventricular ejection fraction > 40% OR shortening fraction > 26%
Comorbidity index < 5 at the time of pre-transplant evaluation

Exclusion Criteria

Contraindication to receiving ruxolitinib including
Patients who have known hypersensitivity to JAK inhibitors
Clinical or laboratory evidence of significant renal or hepatic impairment including cirrhosis
Active uncontrolled infection
Known human immunodeficiency virus (HIV) positivity
Women who are pregnant or trying to conceive
Caution should be used in patients with platelets < 100 though adjustments in dose can be made to accommodate anyone with platelets > 50
History of prior allogeneic transplant
Leukemic transformation (> 20% blasts)
Uncontrolled viral or bacterial infection at the time of transplant data review and consent conference
Active or recent (prior 6 month) invasive fungal infection without infectious disease (ID) consult and approval
History of HIV infection
Pregnant or breastfeeding
Patients without a human leukocyte antigen (HLA)-identical sibling donor, 10 of 10 HLA-matched or 9 of 10 allele mismatched unrelated donor, or umbilical cord blood units that meet transplant criteria
Patients with a spleen > 22 cm (>16 cm for cord blood patients) who have NOT received a surgical splenectomy consultation
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