An Open-Label Study of Defibrotide for the Prevention of Acute Graft-versus-Host-Disease (AGvHD)

A Phase 2, Prospective, Randomized, Open-Label Study on the Efficacy of Defibrotide Added to Standard of Care Immunoprophylaxis for the Prevention of Acute Graft-versus-Host-Disease in Adult and Pediatric Patients After Allogeneic Hematopoietic Stem Cell Transplant

Status

Completed

Phases

Phase 2

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT03339297

Enrollment

152

Registered

2017-11-13

Start date

2018-02-21

Completion date

2020-05-12

Last updated

2021-08-18

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Acute-graft-versus-host Disease, Graft-versus-host Disease

Brief summary

This is a study comparing the defibrotide prophylaxis arm vs standard of care arm for the prevention of aGvHD.

Interventions

DRUGStandard of Care

Administered according to local institutional guidelines, physician preference, and patient need.

DRUGDefibrotide

6.25 mg/kg via 2-hour IV infusion every 6 hours

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Masking

NONE

Eligibility

Sex/Gender

ALL

Age

1 Years to No maximum

Healthy volunteers

Inclusion criteria

1. Participant must be ≥1 year of age at screening and undergoing allogeneic Hematopoietic Stem Cell Transplant (HSCT). 2. Participant must be diagnosed with acute leukemia in morphologic complete remission (CR1 or CR2) or with Myelodysplastic syndrome (MDS) with no circulating blasts and with less than 5% blasts in the bone marrow 3. Participant must have planned to receive either a myeloablative or reduced-intensity conditioning regimen and have an unrelated donor who is human leukocyte antigen (HLA) matched or single-allele mismatched 4. Participant must receive the following medical regimen as part of standard of care immunoprophylaxis for GvHD in either study arm at doses and regimen determined by local institutional guidelines, physician preference, and participant need: Methotrexate (MTX) or Mycophenolate mofetil (MMF) + calcineurin inhibitor (Cyclosporine A \[CSA\] or Tacrolimus \[TAC\]) +/- Anti-thymocyte globulin (ATG) (ATG use is limited to 30% of participants). 5. Graft must be a CD3+ T-cell replete peripheral blood stem cell (PBSC) graft or non-manipulated bone marrow (BM) graft. 6. Adult participants must be able to understand and sign a written informed consent. For pediatric participants, the parent/legal guardian or representative must be able to understand and sign a written informed consent. Assent, when appropriate, will be obtained according to institutional guidelines.

Exclusion criteria

1. Participant has had a prior autologous or allogeneic HSCT. 2. Participant is using or plans to use an investigational agent for the prevention of GvHD. 3. Participant is receiving or plans to receive other investigational therapy and/or is enrolled or plans to enroll in a separate clinical study. 4. Participant, in the opinion of the investigator, may not be able to comply with the safety monitoring requirements of the study. 5. Participant has a psychiatric illness that would prevent the participant or legal guardian or representative from giving informed consent and/or assent. 6. Participant has a serious active disease or co-morbid medical condition, as judged by the investigator, which would interfere with the conduct of this study. 7. Participant is pregnant or lactating and does not agree to stop breastfeeding. 8. Any other condition that would cause a risk to the participant if he/she participated in the trial. 9. Participant has a known history of hypersensitivity to defibrotide or any of the excipients. 10. Participant had acute bleeding that is clinically significant within 24 hours before the start of study treatment, defined as either of the following: * Hemorrhage requiring \>15 cc/kg of packed red blood cells (eg, pediatric participant weighing 20 kg and requiring 300 cc packed red blood cells/24 hours, or an adult weighing \>70 kg and requiring 3 units of packed red blood cells/24hours) to replace blood loss, or * Bleeding from a site which, in the investigator's opinion, constituted a potential life-threatening source (eg, pulmonary hemorrhage or central nervous system bleeding), irrespective of amount of blood loss 11. Participant used any medication that increases the risk of bleeding within 24 hours before the start of study treatment, including, but not limited to, systemic heparin, low molecular weight heparin, heparin analogs, alteplase, streptokinase, urokinase, antithrombin III, oral anticoagulants including warfarin, and other agents that increase the risk of bleeding. Participants may have received heparin or other anticoagulants for routine central venous line management and intermittent dialysis or ultrafiltration. Fibrinolytic instillation for central venous line occlusion was also permitted. Note: Heparin used to keep catheters open was allowed (up to 100 U/kg/day).

Design outcomes

Primary

Measure	Time frame	Description
Cumulative Incidence Percentage of Grade B to D Acute Graft Versus Host Disease (aGvHD) by Day +100 Post-Hematopoietic Stem Cell Transplant (HSCT)	HSCT Day (Day +0 post-HSCT) through Day +100 post-HSCT	Cumulative Incidence Percentage of Grade B to D aGvHD was defined using the International Bone Marrow Transplant Registry (IBMTR) Severity Index. Grade B is defined as Skin stage = 2 or Liver stage = 1 to 2 or GI stage = 1 to 2. Grade C is defined as Skin stage = 3 or Liver stage = 3 or GI stage = 3. Grade D is defined as a Skin stage = 4 or Liver stage = 4 or GI stage = 4.

Secondary

Measure	Time frame	Description
Kaplan-Meier Estimate of Grade B to D aGvHD-free Survival by Days +100 and +180 Post-HSCT	HSCT Day (Day +0 post-HSCT) through Days +100 and +180 post-HSCT	Grade B to D aGvHD was defined using the IBMTR Severity Index. Grade B is defined as Skin stage = 2 or Liver stage = 1 to 2 or GI stage = 1 to 2. Grade C is defined as Skin stage = 3 or Liver stage = 3 or GI stage = 3. Grade D is defined as a Skin stage = 4 or Liver stage = 4 or GI stage = 4.
Cumulative Incidence Percentage of Grade C to D aGvHD by Days +100 and +180 Post-HSCT	HSCT Day (Day +0 post-HSCT) through Days +100 and +180 post-HSCT	Cumulative Incidence Percentage of Grade C to D aGvHD was defined using the IBMTR Severity Index. Grade C is defined as Skin stage = 3 or Liver stage = 3 or GI stage = 3. Grade D is defined as a Skin stage = 4 or Liver stage = 4 or GI stage = 4.
Cumulative Incidence Percentage of Disease Relapse by Days +100 and +180 Post-HSCT	HSCT Day (Day +0 post-HSCT) through Days +100 and +180 post-HSCT	Disease relapse was defined by either morphological evidence of acute leukemia or Myelodysplastic syndrome (MDS) consistent with pre-transplant features, documented or not by biopsy. The event was defined as an increase in size of prior sites of disease or evidence of new sites of disease, documented or not by biopsy. Disease relapse was diagnosed when there was morphological or clinical evidence of the following: reappearance of leukemia blast cells in the peripheral blood, or \>5% blasts in the bone marrow (BM), not attributable to another cause (eg, BM regeneration), or the appearance of previous or new dysplastic changes (MDS specific) within the BM, with or without falling donor chimerism, or the development of extramedullary leukemia or leukemic cells in the cerebral spinal fluid, or institution of therapy to treat relapsed disease, including donor lymphocyte infusion.
Cumulative Incidence Percentage of Systemic Steroids for the Treatment of aGvHD +180 Days Post-HSCT	HSCT Day (Day +0 post-HSCT) through Day +180 post-HSCT	For each treatment arm, the cumulative incidence rate of systemic steroid use for the treatment of aGvHD by Day +180 post-HSCT will be estimated using the cumulative incidence competing risk estimator. The calculation of the cumulative incidence rates and the stratified Gray's test was carried out using the LIFETEST procedure in SAS version 9.4. If the participant experienced a competing risk event, then the initiation date was used to calculate the time-to-event variable.
Change From Baseline to Days +100 and +180 Post-HSCT in the Physical Wellbeing Subscale as Measured by the Functional Assessment of Cancer Therapy-Bone Marrow Transplant (FACT-BMT) Questionnaire Score	Baseline through Days +100 and +180 post-HSCT	The Functional Assessment of Cancer Therapy-Bone Marrow Transplant (FACT-BMT) total score is the sum of the FACT physical wellbeing score, the FACT social/family wellbeing score, the FACT emotional wellbeing score, the FACT functional wellbeing score, and the FACT-BMT subscale. The FACT physical wellbeing subscale scores range from a minimum of 0 to a maximum of 28, with higher scores indicating better quality of life. A negative change from baseline indicates a decrease in score.
Change From Baseline to Days +100 and +180 Post-HSCT in the Social/Family Wellbeing Subscale as Measured by the FACT-BMT Questionnaire Score	Baseline through Days +100 and +180 post-HSCT	The Functional Assessment of Cancer Therapy-Bone Marrow Transplant (FACT-BMT) total score is the sum of the FACT physical wellbeing score, the FACT social/family wellbeing score, the FACT emotional wellbeing score, the FACT functional wellbeing score, and the FACT-BMT subscale. The FACT social/family wellbeing subscale scores range from a minimum of 0 to a maximum of 28, with higher scores indicating better quality of life. A negative change from baseline indicates a decrease in score.
Change From Baseline to Days +100 and +180 Post-HSCT in the Emotional Wellbeing Subscale as Measured by the FACT-BMT Questionnaire Score	Baseline through Days +100 and +180 post-HSCT	The Functional Assessment of Cancer Therapy-Bone Marrow Transplant (FACT-BMT) total score is the sum of the FACT physical wellbeing score, the FACT social/family wellbeing score, the FACT emotional wellbeing score, the FACT functional wellbeing score, and the FACT-BMT subscale. The FACT emotional wellbeing subscale scores range from a minimum of 0 to a maximum of 24, with higher scores indicating better quality of life.
Change From Baseline to Days +100 and +180 Post-HSCT in the Functional Wellbeing Subscale as Measured by the FACT-BMT Questionnaire Score	Baseline through Days +100 and +180 post HSCT	The Functional Assessment of Cancer Therapy-Bone Marrow Transplant (FACT-BMT) total score is the sum of the FACT physical wellbeing score, the FACT social/family wellbeing score, the FACT emotional wellbeing score, the FACT functional wellbeing score, and the FACT-BMT subscale. The FACT functional wellbeing subscale scores range from a minimum of 0 to a maximum of 28, with higher scores indicating better quality of life. A negative change from baseline indicates a decrease in score.
Change From Baseline to Days +100 and +180 Post-HSCT in the Bone Marrow Transplantation Subscale (BMTS) as Measured by the FACT-BMT Questionnaire Score	Baseline through Days +100 and +180 post-HSCT	The Functional Assessment of Cancer Therapy-Bone Marrow Transplant (FACT-BMT) total score is the sum of the FACT physical wellbeing score, the FACT social/family wellbeing score, the FACT emotional wellbeing score, the FACT functional wellbeing score, and the FACT-BMT subscale. The FACT-BMT subscale scores range from a minimum of 0 to a maximum of 40, with higher scores indicating better quality of life. A negative change from baseline indicates a decrease in score.
Change From Baseline to Days +100 and +180 Post-HSCT in the General (FACT-G) Questionnaire Score	Baseline through Days +100 and +180 post-HSCT	The FACT-General (FACT-G) is a core component of the FACT-BMT, and includes 4 of the 5 subscales included in the FACT-BMT total score (FACT physical wellbeing score, FACT social/family wellbeing score, FACT emotional wellbeing score, the FACT functional wellbeing score). In line with this similarity, results of the FACT-G exhibited the same pattern as described for the FACT-BMT total score. The FACT-G scores range from a minimParticipants were age ≥16 years at baseline.
Change From Baseline to Days +100 and +180 Post-HSCT in the FACT-BMT Total Score	Baseline through Days +100 and +180 post-HSCT	The Functional Assessment of Cancer Therapy-Bone Marrow Transplant (FACT-BMT) total score is the sum of the FACT physical wellbeing score, the FACT social/family wellbeing score, the FACT emotional wellbeing score, the FACT functional wellbeing score, and the FACT-BMT subscale. The FACT-BMT total score range is from a minimum of 0 to a maximum of 148, with higher scores indicating better quality of life. A negative change from baseline indicates a decrease in score.
Change From Baseline to Days +100 and +180 Post-HSCT in the Functional Assessment of Cancer Therapy-Bone Marrow Transplant-Trial Outcomes Index (FACT-BMT-TOI)	Baseline through Days +100 and +180 post-HSCT	The FACT-BMT-TOI is defined as the sum of the FACT physical wellbeing score, the FACT functional wellbeing score, and the FACT-BMT subscale. Scores range from a minimum of 0 to a maximum of 96, with higher scores indicating better quality of life. A negative change from baseline indicates a decrease in score.
Cumulative Incidence Percentage of Grade B to D aGvHD by Day +180 Post-HSCT	HSCT Day (Day +0 post-HSCT) through Day +180 post-HSCT	Cumulative Incidence Percentage of Grade B to D aGvHD was defined using the IBMTR Severity Index. Grade B is defined as Skin stage = 2 or Liver stage = 1 to 2 or GI stage = 1 to 2. Grade C is defined as Skin stage = 3 or Liver stage = 3 or GI stage = 3. Grade D is defined as a Skin stage = 4 or Liver stage = 4 or GI stage = 4.
Change From Baseline to Days +100 and +180 Post-HSCT in Participant Reported Outcomes as Measured Based on the EQ Visual Analog Scale (EQ VAS)	Baseline through Days +100 and +180 post-HSCT	The EQ VAS score at baseline and each of the post-HSCT assessments was summarized and presented using descriptive statistics. A higher EQ VAS score represents better QoL. For each of the post-HSCT assessments, change between baseline and that assessment in the EQ VAS score was calculated similarly to the EQ-5D-5L index value for a specific participant and was summarized and presented using descriptive statistics. The score ranges from a minimum of 0 and a maximum of 100. A negative change in the score indicates a decrease in quality of life.
Change From Baseline to Day +100 Post-HSCT in 5-Level European Quality of Life (EQ-5D-5L) Mobility Dimension for Participants With Age >=16 Years	Baseline through Day +100 post-HSCT	The EQ-5D-5L is a standardized instrument for use as a measure of health outcome that includes a descriptive system consisting of 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). For each of the 5 dimensions based on the descriptive system of the EQ-5D-5L, the numbers of participants for all categories (the 5 levels of reported problems) were assessed. For Day +100 Post-HSCT change between baseline in each dimension will be categorized as follows for a specific participant: Condition improved, if the reported level of problem is lower at that assessment than at baseline; Condition unchanged, if the reported level of problem remains the same; Condition deteriorated, if the reported level of problem is higher at that assessment than at baseline; Unknown, if the reported level of problem is not completed or missing either at baseline or at that assessment.
Change From Baseline to Day +180 Post-HSCT in 5-Level European Quality of Life (EQ-5D-5L) Mobility Dimension for Participants With Age >=16 Years	Baseline through Day +180 post-HSCT	The EQ-5D-5L is a standardized instrument for use as a measure of health outcome that includes a descriptive system consisting of 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). For each of the 5 dimensions based on the descriptive system of the EQ-5D-5L, the numbers of participants for all categories (the 5 levels of reported problems) were assessed. For Day +180 Post-HSCT change between baseline in each dimension will be categorized as follows for a specific participant: Condition improved, if the reported level of problem is lower at that assessment than at baseline; Condition unchanged, if the reported level of problem remains the same; Condition deteriorated, if the reported level of problem is higher at that assessment than at baseline; Unknown, if the reported level of problem is not completed or missing either at baseline or at that assessment.
Change From Baseline to Day +100 Post-HSCT in 5-Level European Quality of Life (EQ-5D-5L) Pain/Discomfort Dimension for Participants With Age >=16 Years	Baseline through Day +100 post-HSCT	The EQ-5D-5L is a standardized instrument for use as a measure of health outcome that includes a descriptive system consisting of 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). For each of the 5 dimensions based on the descriptive system of the EQ-5D-5L, the numbers of participants for all categories (the 5 levels of reported problems) were assessed. For Days +100 Post-HSCT change between baseline in each dimension will be categorized as follows for a specific participant: Condition improved, if the reported level of problem is lower at that assessment than at baseline; Condition unchanged, if the reported level of problem remains the same; Condition deteriorated, if the reported level of problem is higher at that assessment than at baseline; Unknown, if the reported level of problem is not completed or missing either at baseline or at that assessment.
Change From Baseline to Day +180 Post-HSCT in 5-Level European Quality of Life (EQ-5D-5L) Pain/Discomfort Dimension for Participants With Age >=16 Years	Baseline through Day +180 post-HSCT	The EQ-5D-5L is a standardized instrument for use as a measure of health outcome that includes a descriptive system consisting of 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). For each of the 5 dimensions based on the descriptive system of the EQ-5D-5L, the numbers of participants for all categories (the 5 levels of reported problems) were assessed. For Day +180 Post-HSCT change between baseline in each dimension will be categorized as follows for a specific participant: Condition improved, if the reported level of problem is lower at that assessment than at baseline; Condition unchanged, if the reported level of problem remains the same; Condition deteriorated, if the reported level of problem is higher at that assessment than at baseline; Unknown, if the reported level of problem is not completed or missing either at baseline or at that assessment.
Change From Baseline to Day +100 Post-HSCT in 5-Level European Quality of Life (EQ-5D-5L) Self-Care Dimension for Participants With Age >=16 Years	Baseline through Day +100 post-HSCT	The EQ-5D-5L is a standardized instrument for use as a measure of health outcome that includes a descriptive system consisting of 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). For each of the 5 dimensions based on the descriptive system of the EQ-5D-5L, the numbers of participants for all categories (the 5 levels of reported problems) were assessed. For Day +100 Post-HSCT change between baseline in each dimension will be categorized as follows for a specific participant: Condition improved, if the reported level of problem is lower at that assessment than at baseline; Condition unchanged, if the reported level of problem remains the same; Condition deteriorated, if the reported level of problem is higher at that assessment than at baseline; Unknown, if the reported level of problem is not completed or missing either at baseline or at that assessment.
Change From Baseline to Day +180 Post-HSCT in 5-Level European Quality of Life (EQ-5D-5L) Self-Care Dimension for Participants With Age >=16 Years	Baseline through Day +180 post-HSCT	The EQ-5D-5L is a standardized instrument for use as a measure of health outcome that includes a descriptive system consisting of 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). For each of the 5 dimensions based on the descriptive system of the EQ-5D-5L, the numbers of participants for all categories (the 5 levels of reported problems) were assessed. For Day +180 Post-HSCT change between baseline in each dimension will be categorized as follows for a specific participant: Condition improved, if the reported level of problem is lower at that assessment than at baseline; Condition unchanged, if the reported level of problem remains the same; Condition deteriorated, if the reported level of problem is higher at that assessment than at baseline; Unknown, if the reported level of problem is not completed or missing either at baseline or at that assessment.
Change From Baseline to Day +100 Post-HSCT in 5-Level European Quality of Life (EQ-5D-5L) Usual Activities Dimension for Participants With Age >=16 Years	Baseline through Day +100 post-HSCT	The EQ-5D-5L is a standardized instrument for use as a measure of health outcome that includes a descriptive system consisting of 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). For each of the 5 dimensions based on the descriptive system of the EQ-5D-5L, the numbers of participants for all categories (the 5 levels of reported problems) were assessed. For Day +100 Post-HSCT change between baseline in each dimension will be categorized as follows for a specific participant: Condition improved, if the reported level of problem is lower at that assessment than at baseline; Condition unchanged, if the reported level of problem remains the same; Condition deteriorated, if the reported level of problem is higher at that assessment than at baseline; Unknown, if the reported level of problem is not completed or missing either at baseline or at that assessment.
Change From Baseline to Day +180 Post-HSCT in 5-Level European Quality of Life (EQ-5D-5L) Usual Activities Dimension for Participants With Age >=16 Years	Baseline through Day +180 post-HSCT	The EQ-5D-5L is a standardized instrument for use as a measure of health outcome that includes a descriptive system consisting of 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). For each of the 5 dimensions based on the descriptive system of the EQ-5D-5L, the numbers of participants for all categories (the 5 levels of reported problems) were assessed. For Day +180 Post-HSCT change between baseline in each dimension will be categorized as follows for a specific participant: Condition improved, if the reported level of problem is lower at that assessment than at baseline; Condition unchanged, if the reported level of problem remains the same; Condition deteriorated, if the reported level of problem is higher at that assessment than at baseline; Unknown, if the reported level of problem is not completed or missing either at baseline or at that assessment.
Change From Baseline to Day +100 Post-HSCT in 5-Level European Quality of Life (EQ-5D-5L) Anxiety/Depression Dimension for Participants With Age >=16 Years	Baseline through Day +100 post-HSCT	The EQ-5D-5L is a standardized instrument for use as a measure of health outcome that includes a descriptive system consisting of 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). For each of the 5 dimensions based on the descriptive system of the EQ-5D-5L, the numbers of participants for all categories (the 5 levels of reported problems) were assessed. For Day +100 Post-HSCT change between baseline in each dimension will be categorized as follows for a specific participant: Condition improved, if the reported level of problem is lower at that assessment than at baseline; Condition unchanged, if the reported level of problem remains the same; Condition deteriorated, if the reported level of problem is higher at that assessment than at baseline; Unknown, if the reported level of problem is not completed or missing either at baseline or at that assessment.
Change From Baseline to Day +180 Post-HSCT in 5-Level European Quality of Life (EQ-5D-5L) Anxiety/Depression Dimension for Participants With Age >=16 Years	Baseline through Day +180 post-HSCT	The EQ-5D-5L is a standardized instrument for use as a measure of health outcome that includes a descriptive system consisting of 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). For each of the 5 dimensions based on the descriptive system of the EQ-5D-5L, the numbers of participants for all categories (the 5 levels of reported problems) were assessed. For Day +180 Post-HSCT change between baseline in each dimension will be categorized as follows for a specific participant: Condition improved, if the reported level of problem is lower at that assessment than at baseline; Condition unchanged, if the reported level of problem remains the same; Condition deteriorated, if the reported level of problem is higher at that assessment than at baseline; Unknown, if the reported level of problem is not completed or missing either at baseline or at that assessment.
Change From Baseline to Days +100 and +180 Post-HSCT in Participant Reported Outcomes Measured Based on the EQ-5D-5L Index Value for Health States	Baseline through Days +100 and +180 post-HSCT	The 5-Level EuroQol-5D health questionnaire (EQ-5D-5L) index value, which is country-specific, was only performed for participants in the US. The EQ-5D-5L is a standardized instrument for use as a measure of health outcome that includes a descriptive system consisting of 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). Change from the baseline assessment to Days +100 and +180 post-HSCT in the index value was assessed. The index value total range is from a minimum value of -1 to a maximum value of +1. A higher EQ-5D-5L index value represents better quality of life (QoL), thus a positive change in the index value represents improved QoL.

Countries

Austria, Belgium, Bulgaria, Canada, Croatia, France, Germany, Greece, Italy, Poland, Portugal, Spain, United Kingdom, United States

Participant flow

Pre-assignment details

Informed Consent and/or assent was obtained from participants, parents/legal guardians or representatives.

Participants by arm

Arm	Count
Defibrotide Prophylaxis Participants were administered Defibrotide Prophylaxis solution intravenously by study personnel at a dose of 25 mg/kg/day (6.25 mg/kg via 2-hour IV infusion every 6 hours) and Standard of Care immunoprophylaxis according to local institutional guidelines, physician preference, and patient need.	79
Standard of Care Immunoprophylaxis Participants were administered Standard of Care immunoprophylaxis alone according to local institutional guidelines, physician preference, and patient need.	73
Total	152

Withdrawals & dropouts

Period	Reason	FG000	FG001
Overall Study	Adverse Event, Non-fatal	1	0
Overall Study	Adverse Event, Serious Fatal	0	2
Overall Study	Consent Withdrawn by Participant	3	3
Overall Study	Death	10	7
Overall Study	Disease Relapse	2	0
Overall Study	Early Termination, Did Not Proceed to Transplant	1	0
Overall Study	Hepatic Candidosis	1	0
Overall Study	Patient Relapsed and Did Not Proceed to Transplant	0	1
Overall Study	Patient Was Not Eligible	1	0
Overall Study	Physician Decision	1	1
Overall Study	Problems with Donor and Diagnosis of Early Relapse	1	0
Overall Study	Relapse of Disease New Transplant Performed	1	0
Overall Study	Relapse of Hematologic Disease	1	0

Baseline characteristics

Characteristic	Standard of Care Immunoprophylaxis	Total	Defibrotide Prophylaxis
Age, Continuous	51.09 years STANDARD_DEVIATION 16.621	50.80 years STANDARD_DEVIATION 16.741	50.54 years STANDARD_DEVIATION 16.952
Ethnicity (NIH/OMB) Hispanic or Latino	1 Participants	2 Participants	1 Participants
Ethnicity (NIH/OMB) Not Hispanic or Latino	63 Participants	130 Participants	67 Participants
Ethnicity (NIH/OMB) Unknown or Not Reported	9 Participants	20 Participants	11 Participants
Race (NIH/OMB) American Indian or Alaska Native	0 Participants	0 Participants	0 Participants
Race (NIH/OMB) Asian	4 Participants	5 Participants	1 Participants
Race (NIH/OMB) Black or African American	1 Participants	1 Participants	0 Participants
Race (NIH/OMB) More than one race	0 Participants	0 Participants	0 Participants
Race (NIH/OMB) Native Hawaiian or Other Pacific Islander	0 Participants	0 Participants	0 Participants
Race (NIH/OMB) Unknown or Not Reported	5 Participants	17 Participants	12 Participants
Race (NIH/OMB) White	63 Participants	129 Participants	66 Participants
Sex: Female, Male Female	37 Participants	75 Participants	38 Participants
Sex: Female, Male Male	36 Participants	77 Participants	41 Participants

Adverse events

Event type	EG000 affected / at risk	EG001 affected / at risk
deaths Total, all-cause mortality	10 / 74	9 / 70
other Total, other adverse events	74 / 74	70 / 70
serious Total, serious adverse events	31 / 74	31 / 70

Outcome results

Primary

Cumulative Incidence Percentage of Grade B to D Acute Graft Versus Host Disease (aGvHD) by Day +100 Post-Hematopoietic Stem Cell Transplant (HSCT)

Cumulative Incidence Percentage of Grade B to D aGvHD was defined using the International Bone Marrow Transplant Registry (IBMTR) Severity Index. Grade B is defined as Skin stage = 2 or Liver stage = 1 to 2 or GI stage = 1 to 2. Grade C is defined as Skin stage = 3 or Liver stage = 3 or GI stage = 3. Grade D is defined as a Skin stage = 4 or Liver stage = 4 or GI stage = 4.

Time frame: HSCT Day (Day +0 post-HSCT) through Day +100 post-HSCT

Population: Cumulative Incidence Rate of Grade B to D Acute Graft Versus Host Disease (aGvHD) was assessed using the Intent-to-Treat Analysis Set.

Arm	Measure	Value (NUMBER)
Defibrotide Prophylaxis	Cumulative Incidence Percentage of Grade B to D Acute Graft Versus Host Disease (aGvHD) by Day +100 Post-Hematopoietic Stem Cell Transplant (HSCT)	38.4 cumulative incidence percentage
Standard of Care Immunoprophylaxis	Cumulative Incidence Percentage of Grade B to D Acute Graft Versus Host Disease (aGvHD) by Day +100 Post-Hematopoietic Stem Cell Transplant (HSCT)	47.1 cumulative incidence percentage

Secondary

Change From Baseline to Day +100 Post-HSCT in 5-Level European Quality of Life (EQ-5D-5L) Anxiety/Depression Dimension for Participants With Age >=16 Years

The EQ-5D-5L is a standardized instrument for use as a measure of health outcome that includes a descriptive system consisting of 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). For each of the 5 dimensions based on the descriptive system of the EQ-5D-5L, the numbers of participants for all categories (the 5 levels of reported problems) were assessed. For Day +100 Post-HSCT change between baseline in each dimension will be categorized as follows for a specific participant: Condition improved, if the reported level of problem is lower at that assessment than at baseline; Condition unchanged, if the reported level of problem remains the same; Condition deteriorated, if the reported level of problem is higher at that assessment than at baseline; Unknown, if the reported level of problem is not completed or missing either at baseline or at that assessment.

Time frame: Baseline through Day +100 post-HSCT