Thrombotic MicroangiopathiesPhase 2NCT03384693
Defibrotide TMA Prophylaxis Pilot Trial
A Phase 2 study testing Defibrotide in people with Thrombotic Microangiopathies, run by University of California, San Francisco at 1 site in United States.
Trial summary
Thrombotic microangiopathy (TMA) is a common complication in the stem cell transplant population. Certain populations within the hematopoietic stem cell transplant (HSCT) population are at a higher risk than others. Read more about this study
- Who is it for?
- Ages Up to 30 years
- Conditions the study is for
- Thrombotic Microangiopathies
- What is being tested?
- Defibrotide
- Type of treatment
- Injection or infusion
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 25 participants
- Where
- 1 siteUnited States
- Study dates
- 1 May 2018to 31 Jul 2020
- Phase
- Phase 2
- Are there results?
- Yes, posted in the registrySummary in the doctors' view
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages Up to 30 years
- All sexes
- No healthy volunteers
- Child, Adult
Who may be able to join
- Age 0-30 years of age
- Life expectancy > 6 months
- Eastern Cooperative Oncology Group or Karnofsky Performance Status >40
- Meets minimum organ function requirements per institutional standard of care guiding clearance for autologous or allogeneic stem cell transplantation.
- Patients must meet TMA High-Risk criteria 5A or 5B below:
- 5A. Patients undergoing tandem autologous transplant with thiotepa in one or more of the conditioning regimens
Show all 12Show fewer
- OR:
- 5B. . Patients with at least 3 of the following characteristics:
- >10 years of age
- Non-Caucasian race/ Hispanic ethnicity
- Undergoing haploidentical transplant
- Minor ABO blood group mismatch
Who cannot join
- Age >30 years
- Life expectancy < 6 months
- Known bleeding diathesis or bleeding risk deemed by the treating physician to be a contraindication to administration of anticoagulants.
- Known hypersensitivity reaction to defibrotide
- Any patient not meeting TMA High-Risk criteria
- Pregnant women are excluded from this study because they will be receiving teratogenic therapy as part of the stem cell transplant.
Trial locations and contacts
1 site in 1 country.
United States1 site
Benioff Children's Hospital at UCSF Medical Center
San Francisco, California, 94143
About this study
Official title: A Pilot Trial of Using Pre-Transplant Risk Stratification and Prophylactic Defibrotide to Prevent Serious Thrombotic Microangiopathy in High-Risk Hematopoietic Stem Cell Transplant Patients
Thrombotic microangiopathy (TMA) is a common complication in the stem cell transplant population. Certain populations within the hematopoietic stem cell transplant (HSCT) population are at a higher risk than others. Defibrotide is an endothelial stabilizing agent which may prevent the endothelial damage that triggers TMA in HSCT patients. The feasibility, safety, and efficacy of defibrotide prophylaxis in a pediatric transplant population is unknown. Twenty five patients age 0 to 30 years receiving autologous or allogeneic hematopoeitic stem cell transplant who meet TMA high risk criteria will be enrolled. Patients will receive Defibrotide for 28-35 days starting before conditioning, and will be closely monitored for any adverse events up through 6 months post-transplant. The feasibility of administering defibrotide will be evaluated as well as incidence of TMA.
Read the detailed description
This is an open-label, single arm pilot study of defibrotide given as prophylaxis to patients receiving a conditioned stem cell transplant for the purpose of preventing post-transplant microangiopathy. The University of California San Francisco Blood and Marrow Transplant program reviewed all cases of non-relapse related death from 2012 through 2015 and identified a complication of endothelial injury known as transplant associated thrombotic microangiopathy (TMA) as the most common cause of transplant related mortality in its patient population. TMA is a multi-system disease in which widespread endothelial injury leads to microangiopathic hemolytic anemia, intravascular platelet activation and formation of thrombi within the microcirculation. Diagnosis of TMA can be difficult as systemic signs and symptoms of TMA are often similar to other common transplant complications, such as medication induced hypertension and cytopenias. The reported prevalence of TMA is varied likely due to diagnostic uncertainty and transplant center expertise, but large retrospective studies have reported it as 10-39%, with the majority of cases occurring in the first 100 days after transplant. Of the patients who develop TMA, approximately half of them will develop severe disease. Outcomes are poor with a reported 30-50% mortality rate and as high as 80% in patients with severe disease. Furthermore, survivors of TMA may have significant morbidity (e.g. renal failure and need for long-term dialysis, heart failure, and significantly prolonged hospital admission). There is no gold standard of treatment for TMA. Supportive care includes renal support, discontinuation of calcineurin inhibitors, and treatment of infections. Treatment options include plasma exchange, complement cascade blockade, and defibrotide. Early treatment is crucial to decrease morbidity and mortality.
Despite the early recognition and treatment of TMA, poor outcomes occur when patients are treated with complement blockade alone. This suggests that complement activation may trigger a complex cascade of parallel inflammatory mediators that lead to end organ damage independent of the complement pathway. The goal is to prevent TMA whenever possible via augmentation of endothelial repair. Defibrotide is an anticoagulant and fibrinolytic agent that has been shown to be an effective treatment in other endothelial disorders such as hepatic veno-occlusive disease. It is a polydeoxyribonucleotide salt that blocks plasminogen activator inhibitor-1 (PAI-1) and attenuates the effect of tumor necrosis factor. It also increases prostaglandin E2 and prostacyclin levels which alters the platelet activity adhesion and aggregation and relaxes the smooth muscle of blood vessel walls. All of this likely protects the endothelium from damage. It has been shown that patients with TMA who were treated with defibrotide had a 77% response rate.
The use of defibrotide in the context of veno occlusive disease (VOD) treatment and prevention has been studied extensively, including a landmark report showing that defibrotide given to children during stem cell transplant conditioning is safe and effective in the prevention of veno-occlusive disease. Also, defibrotide showed a 67-77% response rate when used as treatment in patients who developed TMA. However, there has not been a prospective study to show that such prophylaxis is effective in the prevention of TMA in pediatric patients undergoing hematopoetic stem cell transplant (HCT).
Patients will receive Defibrotide 6.25mg/kg via two hour intravenous infusions given every 6 hours. Defibrotide will start the day before conditioning is initiated, and will last for 28 to 35 days. During defibrotide administration, participants will have assessments of administration feasibility, hypersensitivity reaction, and bleeding. All hematopoietic stem cell transplant standard of care evaluations will be conducted, including routine clinical evaluations and laboratory assessments.
Patients will be followed for 6 months post-HSCT, or until death, whichever occurs first. All patients will be evaluated for toxicity from the time of their first treatment with the study drug. The study will use the CTCAE v4.03 for reporting of non-hematologic adverse events and modified criteria for hematologic adverse events. Patients removed from study for unacceptable treatment related adverse event(s) will be followed until resolution or stabilization of all treatment-related adverse events to Grade 2 or lower.
Biomarkers indicative of endothelial damage and TMA activity will be drawn to assess subclinical TMA activity as well as risk for subsequent development of TMA while on defibrotide. These include plasma free hemoglobin, suppression of tumorigenicity, angiopoietin 2, and plasminogen activator inhibitor - 1. Study labs will be assessed at 4 time points prior to Day +21, and at diagnosis of TMA.
- Conditions
- Thrombotic Microangiopathies
- Being tested
- Defibrotide
- Keywords
- hematopoeitic stem cell transplant, prophylactic defibrotide
- Medical subject headings
- Thrombotic Microangiopathies
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
DefibrotideDrug
Also called Defitelio
Defibrotide is an anticoagulant and fibrinolytic agent that has been shown to be an effective treatment in other endothelial disorders such as hepatic veno-occlusive disease.
| Study group | Role | What they receive |
|---|---|---|
| Prophylactic Defibrotide | Experimental | 6.25mg/kg administered intravenously every 6 hours for 28 to 35 days, starting on the day before conditioning is initiated. Receives: Drug: Defibrotide |
What is being measured
The primary outcome is the main question the study is designed to answer.
Percent of Total Doses of Defibrotide That Were Missed [Feasibility]
Feasibility will be determined with regard to administration concurrently with chemotherapy and supportive medications before, during, and after stem cell infusion.
Measured: From first treatment with study drug to day +21 post Transplant
Participants With Reportable Serious Adverse Events [Safety] Per CTACAE v5 Grade 3 or Higher
Safety was assessed by evaluating drug-related Serious Adverse Events per CTACAE v5 that occur after prophylactic administration of defibrotide. Analyses will be performed for all patients having received at least one dose of study drug.
Measured: From first treatment with study drug to 6 months post-transplant
Participants With Clinically Significant Bleeding Requiring Discontinuation of Therapy [Safety]
Bleeding was assessed using Common Toxicity Criteria for Adverse Events version 4.03. (CTCAE). Study drug was permanently discontinued at grade 3 bleeding or higher. Analyses will be performed for all patients having received at least one dose of study drug.
Measured: From first treatment with study drug to 6 months post-transplant
Participants With Hypersensitivity Reaction Requiring Discontinuation of Therapy [Safety]
Hypersensitivity reaction will be assessed using Common Toxicity Criteria for Adverse Events version 4.03.
For grade 2 hypersensitivity reaction, study drug will be held until it resolves to grade 1 or lower. Study drug will be permanently discontinued at grade 3 hypersensitivity reaction or higher. Analyses will be performed for all patients having received at least one dose of study drug.
Measured: From first treatment with study drug to 6 months post-transplant
Secondary outcomes (2)
Number of Patients With TMA Enrolled on the Study
Evidence of microangiopathy, with either clinical markers/organ dysfunction or presence of biomarkers, or one of the following: 1) presence of schistocytes in peripheral blood; 2) Histologic evidence of microangiopathy on a tissue specimen; 3) Undetectable haptoglobin with increased reticulocyte counts. If there is no evidence of microangiopathy but at least one clinical marker or at least 3 biomarkers, the participant will meet the criteria for TMA incidence.
Based on prior analysis at our center, we anticipated an incidence of TA-TMA of 28.2% (95 CI, 17.8-38.6%) in the high-risk patients undergoing allogeneic transplants and 40% (95% CI, 13.9-69.5%) in the neuroblastoma patients undergoing planned tandem HSCT
Measured: 6 months post-transplant
Number of Patients With Severe TMA
Severe TMA is defined as any TMA meeting the criteria in Objective 2 with the following complications: renal dysfunction requiring dialysis, pleural or pericardial effusion requiring any medical or surgical intervention, central nervous system dysfunction including seizure or posterior reversible encephalopathy syndrome, or death.
Measured: 6 months post-transplant
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted27 Dec 2017
- Study start1 May 2018
- Primary completion31 Jul 2020
- Study completion31 Jul 2020
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
- Publications (18)Papers the sponsor has linked to this study.
- Other trials for Thrombotic MicroangiopathiesStudies of the same condition, open and under way.
- More trials run by University of California, San FranciscoThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 2
- Primary purpose
- Prevention
- Allocation
- Not applicable
- Intervention model
- Single group
- Model description
- Defibrotide 6.25mg/kg administered intravenously for 28-35 days
- Masking
- None (open label)
- Enrolment
- 25 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of California, San Francisco
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Christine Higham, MD, Principal investigator, University of California, San Francisco
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT03384693
- Sponsor's protocol ID
- 17-23356
- Status last verified
- Sep 2021
- First submitted
- 11 Dec 2017
- Last updated
- 16 Sep 2021
- Results posted
- Yes, on ClinicalTrials.gov
- Data monitoring committee
- Yes
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- Yes: Individual participant data that underlie the results reported in scientific journals after de-identification.
Publications
Cho BS, Yahng SA, Lee SE, Eom KS, Kim YJ, Kim HJ, Lee S, Min CK, Cho SG, Kim DW, Lee JW, Min WS, Park CW. Validation of recently proposed consensus criteria for thrombotic microangiopathy after allogeneic hematopoietic stem-cell transplantation. Transplantation. 2010 Oct 27;90(8):918-26. doi: 10.1097/TP.0b013e3181f24e8d.
PubMed 20717073Choi CM, Schmaier AH, Snell MR, Lazarus HM. Thrombotic microangiopathy in haematopoietic stem cell transplantation: diagnosis and treatment. Drugs. 2009;69(2):183-98. doi: 10.2165/00003495-200969020-00004.
PubMed 19228075Corbacioglu S, Cesaro S, Faraci M, Valteau-Couanet D, Gruhn B, Rovelli A, Boelens JJ, Hewitt A, Schrum J, Schulz AS, Muller I, Stein J, Wynn R, Greil J, Sykora KW, Matthes-Martin S, Fuhrer M, O'Meara A, Toporski J, Sedlacek P, Schlegel PG, Ehlert K, Fasth A, Winiarski J, Arvidson J, Mauz-Korholz C, Ozsahin H, Schrauder A, Bader P, Massaro J, D'Agostino R, Hoyle M, Iacobelli M, Debatin KM, Peters C, Dini G. Defibrotide for prophylaxis of hepatic veno-occlusive disease in paediatric haemopoietic stem-cell transplantation: an open-label, phase 3, randomised controlled trial. Lancet. 2012 Apr 7;379(9823):1301-9. doi: 10.1016/S0140-6736(11)61938-7. Epub 2012 Feb 23.
PubMed 22364685Corti P, Uderzo C, Tagliabue A, Della Volpe A, Annaloro C, Tagliaferri E, Balduzzi A. Defibrotide as a promising treatment for thrombotic thrombocytopenic purpura in patients undergoing bone marrow transplantation. Bone Marrow Transplant. 2002 Mar;29(6):542-3. doi: 10.1038/sj.bmt.1703414. No abstract available.
PubMed 11960280Jodele S, Dandoy CE, Myers KC, El-Bietar J, Nelson A, Wallace G, Laskin BL. New approaches in the diagnosis, pathophysiology, and treatment of pediatric hematopoietic stem cell transplantation-associated thrombotic microangiopathy. Transfus Apher Sci. 2016 Apr;54(2):181-90. doi: 10.1016/j.transci.2016.04.007. Epub 2016 Apr 25.
PubMed 27156964Jodele S, Davies SM, Lane A, Khoury J, Dandoy C, Goebel J, Myers K, Grimley M, Bleesing J, El-Bietar J, Wallace G, Chima RS, Paff Z, Laskin BL. Diagnostic and risk criteria for HSCT-associated thrombotic microangiopathy: a study in children and young adults. Blood. 2014 Jul 24;124(4):645-53. doi: 10.1182/blood-2014-03-564997. Epub 2014 May 29.
PubMed 24876561Jodele S, Zhang K, Zou F, Laskin B, Dandoy CE, Myers KC, Lane A, Meller J, Medvedovic M, Chen J, Davies SM. The genetic fingerprint of susceptibility for transplant-associated thrombotic microangiopathy. Blood. 2016 Feb 25;127(8):989-96. doi: 10.1182/blood-2015-08-663435. Epub 2015 Nov 24.
PubMed 26603840Kim SS, Patel M, Yum K, Keyzner A. Hematopoietic stem cell transplant-associated thrombotic microangiopathy: review of pharmacologic treatment options. Transfusion. 2015 Feb;55(2):452-8. doi: 10.1111/trf.12859. Epub 2014 Sep 11.
PubMed 25209960Kojouri K, George JN. Thrombotic microangiopathy following allogeneic hematopoietic stem cell transplantation. Curr Opin Oncol. 2007 Mar;19(2):148-54. doi: 10.1097/CCO.0b013e3280148a2f.
PubMed 17272988Laskin BL, Goebel J, Davies SM, Jodele S. Small vessels, big trouble in the kidneys and beyond: hematopoietic stem cell transplantation-associated thrombotic microangiopathy. Blood. 2011 Aug 11;118(6):1452-62. doi: 10.1182/blood-2011-02-321315. Epub 2011 May 19.
PubMed 21596850Obut F, Kasinath V, Abdi R. Post-bone marrow transplant thrombotic microangiopathy. Bone Marrow Transplant. 2016 Jul;51(7):891-7. doi: 10.1038/bmt.2016.61. Epub 2016 Mar 14.
PubMed 26974272Richardson PG, Murakami C, Jin Z, Warren D, Momtaz P, Hoppensteadt D, Elias AD, Antin JH, Soiffer R, Spitzer T, Avigan D, Bearman SI, Martin PL, Kurtzberg J, Vredenburgh J, Chen AR, Arai S, Vogelsang G, McDonald GB, Guinan EC. Multi-institutional use of defibrotide in 88 patients after stem cell transplantation with severe veno-occlusive disease and multisystem organ failure: response without significant toxicity in a high-risk population and factors predictive of outcome. Blood. 2002 Dec 15;100(13):4337-43. doi: 10.1182/blood-2002-04-1216. Epub 2002 Aug 1.
PubMed 12393437Rosenthal J. Hematopoietic cell transplantation-associated thrombotic microangiopathy: a review of pathophysiology, diagnosis, and treatment. J Blood Med. 2016 Sep 2;7:181-6. doi: 10.2147/JBM.S102235. eCollection 2016.
PubMed 27621680Uderzo C, Bonanomi S, Busca A, Renoldi M, Ferrari P, Iacobelli M, Morreale G, Lanino E, Annaloro C, Volpe AD, Alessandrino P, Longoni D, Locatelli F, Sangalli H, Rovelli A. Risk factors and severe outcome in thrombotic microangiopathy after allogeneic hematopoietic stem cell transplantation. Transplantation. 2006 Sep 15;82(5):638-44. doi: 10.1097/01.tp.0000230373.82376.46.
PubMed 16969286Uderzo C, Fumagalli M, De Lorenzo P, Busca A, Vassallo E, Bonanomi S, Lanino E, Dini G, Varotto S, Messina C, Miniero R, Valsecchi MG, Balduzzi A. Impact of thrombotic thrombocytopenic purpura on leukemic children undergoing bone marrow transplantation. Bone Marrow Transplant. 2000 Nov;26(9):1005-9. doi: 10.1038/sj.bmt.1702648.
PubMed 11100281
Study at a glance
From the registry record, last updated by the sponsor on 16 Sep 2021. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Pilot Trial of Using Pre-Transplant Risk Stratification and Prophylactic Defibrotide to Prevent Serious Thrombotic Microangiopathy in High-Risk Hematopoietic Stem Cell Transplant Patients
- ClinicalTrials.gov ID
- NCT03384693
- Acronym / sponsor ID
- 17-23356
- Conditions
- Thrombotic Microangiopathies
- Keywords
- hematopoeitic stem cell transplant, prophylactic defibrotide
- Phase
- Phase 2
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 25 participants (actual)
- Lead sponsor
- University of California, San FranciscoUniversity, hospital or other
- Study start
- 1 May 2018 (actual)
- Primary completion
- 31 Jul 2020 (actual)
- Study completion
- 31 Jul 2020 (actual)
- First posted
- 27 Dec 2017 (actual)
- Results
- Posted 16 Sep 2021
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Thrombotic microangiopathy (TMA) is a common complication in the stem cell transplant population. Certain populations within the hematopoietic stem cell transplant (HSCT) population are at a higher risk than others. Defibrotide is an endothelial stabilizing agent which may prevent the endothelial damage that triggers TMA in HSCT patients. The feasibility, safety, and efficacy of defibrotide prophylaxis in a pediatric transplant population is unknown. Twenty five patients age 0 to 30 years receiving autologous or allogeneic hematopoeitic stem cell transplant who meet TMA high risk criteria will be enrolled. Patients will receive Defibrotide for 28-35 days starting before conditioning, and will be closely monitored for any adverse events up through 6 months post-transplant. The feasibility of administering defibrotide will be evaluated as well as incidence of TMA.
Detailed description
This is an open-label, single arm pilot study of defibrotide given as prophylaxis to patients receiving a conditioned stem cell transplant for the purpose of preventing post-transplant microangiopathy. The University of California San Francisco Blood and Marrow Transplant program reviewed all cases of non-relapse related death from 2012 through 2015 and identified a complication of endothelial injury known as transplant associated thrombotic microangiopathy (TMA) as the most common cause of transplant related mortality in its patient population. TMA is a multi-system disease in which widespread endothelial injury leads to microangiopathic hemolytic anemia, intravascular platelet activation and formation of thrombi within the microcirculation. Diagnosis of TMA can be difficult as systemic signs and symptoms of TMA are often similar to other common transplant complications, such as medication induced hypertension and cytopenias. The reported prevalence of TMA is varied likely due to diagnostic uncertainty and transplant center expertise, but large retrospective studies have reported it as 10-39%, with the majority of cases occurring in the first 100 days after transplant. Of the patients who develop TMA, approximately half of them will develop severe disease. Outcomes are poor with a reported 30-50% mortality rate and as high as 80% in patients with severe disease. Furthermore, survivors of TMA may have significant morbidity (e.g. renal failure and need for long-term dialysis, heart failure, and significantly prolonged hospital admission). There is no gold standard of treatment for TMA. Supportive care includes renal support, discontinuation of calcineurin inhibitors, and treatment of infections. Treatment options include plasma exchange, complement cascade blockade, and defibrotide. Early treatment is crucial to decrease morbidity and mortality.
Despite the early recognition and treatment of TMA, poor outcomes occur when patients are treated with complement blockade alone. This suggests that complement activation may trigger a complex cascade of parallel inflammatory mediators that lead to end organ damage independent of the complement pathway. The goal is to prevent TMA whenever possible via augmentation of endothelial repair. Defibrotide is an anticoagulant and fibrinolytic agent that has been shown to be an effective treatment in other endothelial disorders such as hepatic veno-occlusive disease. It is a polydeoxyribonucleotide salt that blocks plasminogen activator inhibitor-1 (PAI-1) and attenuates the effect of tumor necrosis factor. It also increases prostaglandin E2 and prostacyclin levels which alters the platelet activity adhesion and aggregation and relaxes the smooth muscle of blood vessel walls. All of this likely protects the endothelium from damage. It has been shown that patients with TMA who were treated with defibrotide had a 77% response rate.
The use of defibrotide in the context of veno occlusive disease (VOD) treatment and prevention has been studied extensively, including a landmark report showing that defibrotide given to children during stem cell transplant conditioning is safe and effective in the prevention of veno-occlusive disease. Also, defibrotide showed a 67-77% response rate when used as treatment in patients who developed TMA. However, there has not been a prospective study to show that such prophylaxis is effective in the prevention of TMA in pediatric patients undergoing hematopoetic stem cell transplant (HCT).
Patients will receive Defibrotide 6.25mg/kg via two hour intravenous infusions given every 6 hours. Defibrotide will start the day before conditioning is initiated, and will last for 28 to 35 days. During defibrotide administration, participants will have assessments of administration feasibility, hypersensitivity reaction, and bleeding. All hematopoietic stem cell transplant standard of care evaluations will be conducted, including routine clinical evaluations and laboratory assessments.
Patients will be followed for 6 months post-HSCT, or until death, whichever occurs first. All patients will be evaluated for toxicity from the time of their first treatment with the study drug. The study will use the CTCAE v4.03 for reporting of non-hematologic adverse events and modified criteria for hematologic adverse events. Patients removed from study for unacceptable treatment related adverse event(s) will be followed until resolution or stabilization of all treatment-related adverse events to Grade 2 or lower.
Biomarkers indicative of endothelial damage and TMA activity will be drawn to assess subclinical TMA activity as well as risk for subsequent development of TMA while on defibrotide. These include plasma free hemoglobin, suppression of tumorigenicity, angiopoietin 2, and plasminogen activator inhibitor - 1. Study labs will be assessed at 4 time points prior to Day +21, and at diagnosis of TMA.
Study design
- Primary purpose
- Prevention
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
- Model description
- Defibrotide 6.25mg/kg administered intravenously for 28-35 days
| Arm | Type | Receives |
|---|---|---|
| Prophylactic Defibrotide | Experimental | Drug: Defibrotide6.25mg/kg administered intravenously every 6 hours for 28 to 35 days, starting on the day before conditioning is initiated. |
Who may qualify
- Ages
- Up to 30 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult
Key inclusion criteria (12 listed)
- Age 0-30 years of age
- Life expectancy > 6 months
- Eastern Cooperative Oncology Group or Karnofsky Performance Status >40
- Meets minimum organ function requirements per institutional standard of care guiding clearance for autologous or allogeneic stem cell transplantation.
- Patients must meet TMA High-Risk criteria 5A or 5B below:
Key exclusion criteria (6 listed)
- Age >30 years
- Life expectancy < 6 months
- Known bleeding diathesis or bleeding risk deemed by the treating physician to be a contraindication to administration of anticoagulants.
- Known hypersensitivity reaction to defibrotide
- Any patient not meeting TMA High-Risk criteria
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| DefibrotideAlso: DefitelioDefibrotide is an anticoagulant and fibrinolytic agent that has been shown to be an effective treatment in other endothelial disorders such as hepatic veno-occlusive disease. | Drug | Prophylactic Defibrotide |
Primary outcome
Percent of Total Doses of Defibrotide That Were Missed [Feasibility]
Time frame: From first treatment with study drug to day +21 post Transplant
Feasibility will be determined with regard to administration concurrently with chemotherapy and supportive medications before, during, and after stem cell infusion.
Participants With Reportable Serious Adverse Events [Safety] Per CTACAE v5 Grade 3 or Higher
Time frame: From first treatment with study drug to 6 months post-transplant
Safety was assessed by evaluating drug-related Serious Adverse Events per CTACAE v5 that occur after prophylactic administration of defibrotide. Analyses will be performed for all patients having received at least one dose of study drug.
Participants With Clinically Significant Bleeding Requiring Discontinuation of Therapy [Safety]
Time frame: From first treatment with study drug to 6 months post-transplant
Bleeding was assessed using Common Toxicity Criteria for Adverse Events version 4.03. (CTCAE). Study drug was permanently discontinued at grade 3 bleeding or higher. Analyses will be performed for all patients having received at least one dose of study drug.
Participants With Hypersensitivity Reaction Requiring Discontinuation of Therapy [Safety]
Time frame: From first treatment with study drug to 6 months post-transplant
Hypersensitivity reaction will be assessed using Common Toxicity Criteria for Adverse Events version 4.03. For grade 2 hypersensitivity reaction, study drug will be held until it resolves to grade 1 or lower. Study drug will be permanently discontinued at grade 3 hypersensitivity reaction or higher. Analyses will be performed for all patients having received at least one dose of study drug.
2 secondary outcomes
Number of Patients With TMA Enrolled on the Study
Time frame: 6 months post-transplant
Number of Patients With Severe TMA
Time frame: 6 months post-transplant
Results and safety
Loading the posted results from ClinicalTrials.gov…
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 16 Sep 2021.
- Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
- Background: PubMed 20717073Cho BS, Yahng SA, Lee SE, Eom KS, Kim YJ, Kim HJ, Lee S, Min CK, Cho SG, Kim DW, Lee JW, Min WS, Park CW. Validation of recently proposed consensus criteria for thrombotic microangiopathy after allogeneic hematopoietic stem-cell transplantation. Transplantation. 2010 Oct 27;90(8):918-26. doi: 10.1097/TP.0b013e3181f24e8d.
- Background: PubMed 19228075Choi CM, Schmaier AH, Snell MR, Lazarus HM. Thrombotic microangiopathy in haematopoietic stem cell transplantation: diagnosis and treatment. Drugs. 2009;69(2):183-98. doi: 10.2165/00003495-200969020-00004.
- Background: PubMed 22364685Corbacioglu S, Cesaro S, Faraci M, Valteau-Couanet D, Gruhn B, Rovelli A, Boelens JJ, Hewitt A, Schrum J, Schulz AS, Muller I, Stein J, Wynn R, Greil J, Sykora KW, Matthes-Martin S, Fuhrer M, O'Meara A, Toporski J, Sedlacek P, Schlegel PG, Ehlert K, Fasth A, Winiarski J, Arvidson J, Mauz-Korholz C, Ozsahin H, Schrauder A, Bader P, Massaro J, D'Agostino R, Hoyle M, Iacobelli M, Debatin KM, Peters C, Dini G. Defibrotide for prophylaxis of hepatic veno-occlusive disease in paediatric haemopoietic stem-cell transplantation: an open-label, phase 3, randomised controlled trial. Lancet. 2012 Apr 7;379(9823):1301-9. doi: 10.1016/S0140-6736(11)61938-7. Epub 2012 Feb 23.
- Background: PubMed 11960280Corti P, Uderzo C, Tagliabue A, Della Volpe A, Annaloro C, Tagliaferri E, Balduzzi A. Defibrotide as a promising treatment for thrombotic thrombocytopenic purpura in patients undergoing bone marrow transplantation. Bone Marrow Transplant. 2002 Mar;29(6):542-3. doi: 10.1038/sj.bmt.1703414. No abstract available.
- Background: PubMed 27156964Jodele S, Dandoy CE, Myers KC, El-Bietar J, Nelson A, Wallace G, Laskin BL. New approaches in the diagnosis, pathophysiology, and treatment of pediatric hematopoietic stem cell transplantation-associated thrombotic microangiopathy. Transfus Apher Sci. 2016 Apr;54(2):181-90. doi: 10.1016/j.transci.2016.04.007. Epub 2016 Apr 25.
- Background: PubMed 24876561Jodele S, Davies SM, Lane A, Khoury J, Dandoy C, Goebel J, Myers K, Grimley M, Bleesing J, El-Bietar J, Wallace G, Chima RS, Paff Z, Laskin BL. Diagnostic and risk criteria for HSCT-associated thrombotic microangiopathy: a study in children and young adults. Blood. 2014 Jul 24;124(4):645-53. doi: 10.1182/blood-2014-03-564997. Epub 2014 May 29.
- Background: PubMed 26603840Jodele S, Zhang K, Zou F, Laskin B, Dandoy CE, Myers KC, Lane A, Meller J, Medvedovic M, Chen J, Davies SM. The genetic fingerprint of susceptibility for transplant-associated thrombotic microangiopathy. Blood. 2016 Feb 25;127(8):989-96. doi: 10.1182/blood-2015-08-663435. Epub 2015 Nov 24.
- Background: PubMed 25209960Kim SS, Patel M, Yum K, Keyzner A. Hematopoietic stem cell transplant-associated thrombotic microangiopathy: review of pharmacologic treatment options. Transfusion. 2015 Feb;55(2):452-8. doi: 10.1111/trf.12859. Epub 2014 Sep 11.
- Background: PubMed 17272988Kojouri K, George JN. Thrombotic microangiopathy following allogeneic hematopoietic stem cell transplantation. Curr Opin Oncol. 2007 Mar;19(2):148-54. doi: 10.1097/CCO.0b013e3280148a2f.
- Background: PubMed 21596850Laskin BL, Goebel J, Davies SM, Jodele S. Small vessels, big trouble in the kidneys and beyond: hematopoietic stem cell transplantation-associated thrombotic microangiopathy. Blood. 2011 Aug 11;118(6):1452-62. doi: 10.1182/blood-2011-02-321315. Epub 2011 May 19.
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- Individual participant dataSharing planned: Yes. Individual participant data that underlie the results reported in scientific journals after de-identification.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Christine Higham, MD principal investigator
University of California, San Francisco
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 2 study testing Defibrotide in people with Thrombotic Microangiopathies, run by University of California, San Francisco at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 12 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 16 Sep 2021. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
Yes. Results are posted in the registry (first posted 16 Sep 2021). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Percent of Total Doses of Defibrotide That Were Missed [Feasibility] (time frame: From first treatment with study drug to day +21 post Transplant). The study lists 4 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT03384693, which also lists 18 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 16 Sep 2021; AzTrials last refreshed its copy on 27 Oct 2026.