Sinusoidal Obstruction SyndromePhase 2NCT05987124
Defibrotide Dose-escalation for SOS Post-HSCT
A Phase 2 study testing Defibrotide in people with Sinusoidal Obstruction Syndrome and Veno-occlusive Disease, run by New York Medical College at 1 site in United States.
Trial summary
This research study is being done to determine the safety and tolerability of increasing doses of defibrotide within a single patient with sinusoidal obstructive syndrome (SOS)/veno-occlusive disease (VOD) after hematopoietic cell transplantation (HCT) associated with either kidney and/or lung impairment that has not… Read more about this study
- Who is it for?
- Ages 1 month to 75 years
- Conditions the study is for
- Sinusoidal Obstruction Syndrome, Veno-occlusive Disease
- 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
- 20 participants
- Where
- 1 siteUnited States
- Study dates
- 20 Mar 2024to 1 Aug 2028
- Phase
- Phase 2
- Are there results?
- Not yet: the study is under way
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 1 month to 75 years
- All sexes
- No healthy volunteers
- Child, Adult, Older adult
Who may be able to join
- HCT recipients (Auto or Allograft)
- SOS/VOD as defined by Cairo/Cooke Diagnostic criteria (1) (Table 3) with either renal and/or pulmonary dysfunction as defined by Cairo/Cooke Grading criteria (1) (Appendix I).
- Unresponsive to standard defibrotide therapy as defined by at least one of the following:
- Patients with SOS/VOD failing to obtain a complete response (CR) defined by Grade I or less by Cairo/Cooke Grading criteria (1) (Appendix I). This would therefore include patients with stable disease after at least 14 days of defibrotide or partial response after at least 21 days of defibrotide (25mg/kg/day).
- Progressive disease defined by progression of at least one grade or more from diagnostic grade as defined by Cairo/Cooke Grading criteria (1) (Appendix I) following at least 7 days of defibrotide (25mg/kg/day).
- Age 1 month - 75 years
Who cannot join
- Patients who did not receive HCT.
- Concomitant systemic anticoagulation (excluding central venous line management, fibrinolytic instillation for central venous line occlusion, management of intermittent dialysis or ultrafiltration of CVVH).
- Active bleeding and/or hemorrhage of at least grade 2 and above.
- History of development of Grade III/IV anaphylaxis probably or directly secondary to defibrotide.
- Female patients who are pregnant or breast feeding.
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
United States1 site, 1 recruiting
- Recruiting
New York Medical College
Vallhala, New York, 10595
Mitchell S Cairo, MD, 914-594-2150, mitchell_cairo@nymc.edu
Mitchell S. Cairo, MD
About this study
Official title: A Phase II Intrapatient Open-Label Dose Escalation Trial of Defibrotide in Hematopoietic Cell Transplantation (HCT) Recipients With Sinusoidal Obstructive Syndrome (SOS) Post-HCT Associated With Either Renal and/or Pulmonary Dysfunction With Either Refractory or Progressive Disease Following Defibrotide Therapy
This research study is being done to determine the safety and tolerability of increasing doses of defibrotide within a single patient with sinusoidal obstructive syndrome (SOS)/veno-occlusive disease (VOD) after hematopoietic cell transplantation (HCT) associated with either kidney and/or lung impairment that has not obtained a complete response (CR) or progressed in severity with standard doses of defibrotide.
- Being tested
- Defibrotide
- Medical subject headings
- Hepatic Veno-Occlusive Disease
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
DefibrotideDrug
Also called Defitelio
HCT recipients with SOS/VOD and renal and/or pulmonary dysfunction with either PR after 21 days of standard doses of defibrotide (25mg/kg/day) or SD, after 14 days of standard doses of defibrotide (25mg/kg/day) progressive disease after 7 days on defibrotide (25mg/kg/day) will undergo intra-patient dose escalation every 4 days until a complete response is obtained up until the highest dose level of 100mg/kg/day at which point an endpoint of CR, PR or SD will be sought(Maximum of 4 dose levels). Defibrotide will be administered in D5W or 0.9% NaCl via IV infusion over 2 hours q6 hours.
| Study group | Role | What they receive |
|---|---|---|
| Defibrotide | Experimental | 7.1.1 HCT recipients with SOS/VOD and renal and/or pulmonary dysfunction with either PR after 21 days of standard doses of defibrotide (25mg/kg/day) or SD, after 14 days of standard doses of defibrotide (25mg/kg/day) progressive disease after 7 days on defibrotide (25mg/kg/day) will undergo intra-patient dose escalation every 4 days until a complete response is obtained up until the highest dose level of 100mg/kg/day at which point an endpoint of CR, PR or SD will be sought (see 7.2 for definition of response) (Maximum of 4 dose levels) (7.1.2): Receives: Drug: Defibrotide |
What is being measured
The primary outcome is the main question the study is designed to answer.
To determine the incidence of grade 3 or 4 adverse events related to defibrotide
grade 3 and 4 adverse events possible or probably related to defibrotide will be collected
Measured: 100 days
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted14 Aug 2023
- Study start20 Mar 2024
- Primary completion1 Aug 2027 (estimated)
- Study completion1 Aug 2028 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Sinusoidal Obstruction SyndromeStudies of the same condition, open and under way.
- 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
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 20 participants (estimated)
Sponsor and investigators
- Lead sponsor
- New York Medical College
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Mitchell Cairo, MD, Principal investigator, New York Medical College
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05987124
- Sponsor's protocol ID
- NYMC 600
- Status last verified
- Apr 2026
- First submitted
- 4 Aug 2023
- Last updated
- 15 Apr 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 15 Apr 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Phase II Intrapatient Open-Label Dose Escalation Trial of Defibrotide in Hematopoietic Cell Transplantation (HCT) Recipients With Sinusoidal Obstructive Syndrome (SOS) Post-HCT Associated With Either Renal and/or Pulmonary Dysfunction With Either Refractory or Progressive Disease Following Defibrotide Therapy
- ClinicalTrials.gov ID
- NCT05987124
- Acronym / sponsor ID
- NYMC 600
- Phase
- Phase 2
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 20 participants (estimated)
- Lead sponsor
- New York Medical CollegeUniversity, hospital or other
- Study start
- 20 Mar 2024 (actual)
- Primary completion
- 1 Aug 2027 (estimated)
- Study completion
- 1 Aug 2028 (estimated)
- First posted
- 14 Aug 2023 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This research study is being done to determine the safety and tolerability of increasing doses of defibrotide within a single patient with sinusoidal obstructive syndrome (SOS)/veno-occlusive disease (VOD) after hematopoietic cell transplantation (HCT) associated with either kidney and/or lung impairment that has not obtained a complete response (CR) or progressed in severity with standard doses of defibrotide.
Study design
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Defibrotide | Experimental | Drug: Defibrotide7.1.1 HCT recipients with SOS/VOD and renal and/or pulmonary dysfunction with either PR after 21 days of standard doses of defibrotide (25mg/kg/day) or SD, after 14 days of standard doses of defibrotide (25mg/kg/day) progressive disease after 7 days on defibrotide (25mg/kg/day) will undergo intra-patient dose escalation every 4 days until a complete response is obtained up until the highest dose level of 100mg/kg/day at which point an endpoint of CR, PR or SD will be sought (see 7.2 for definition of response) (Maximum of 4 dose levels) (7.1.2): |
Who may qualify
- Ages
- 1 month to 75 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
Key inclusion criteria (6 listed)
- HCT recipients (Auto or Allograft)
- SOS/VOD as defined by Cairo/Cooke Diagnostic criteria (1) (Table 3) with either renal and/or pulmonary dysfunction as defined by Cairo/Cooke Grading criteria (1) (Appendix I).
- Unresponsive to standard defibrotide therapy as defined by at least one of the following:
- Patients with SOS/VOD failing to obtain a complete response (CR) defined by Grade I or less by Cairo/Cooke Grading criteria (1) (Appendix I). This would therefore include patients with stable disease after at least 14 days of defibrotide or partial response after at least 21 days of defibrotide (25mg/kg/day).
- Progressive disease defined by progression of at least one grade or more from diagnostic grade as defined by Cairo/Cooke Grading criteria (1) (Appendix I) following at least 7 days of defibrotide (25mg/kg/day).
Key exclusion criteria (5 listed)
- Patients who did not receive HCT.
- Concomitant systemic anticoagulation (excluding central venous line management, fibrinolytic instillation for central venous line occlusion, management of intermittent dialysis or ultrafiltration of CVVH).
- Active bleeding and/or hemorrhage of at least grade 2 and above.
- History of development of Grade III/IV anaphylaxis probably or directly secondary to defibrotide.
- Female patients who are pregnant or breast feeding.
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: DefitelioHCT recipients with SOS/VOD and renal and/or pulmonary dysfunction with either PR after 21 days of standard doses of defibrotide (25mg/kg/day) or SD, after 14 days of standard doses of defibrotide (25mg/kg/day) progressive disease after 7 days on defibrotide (25mg/kg/day) will undergo intra-patient dose escalation every 4 days until a complete response is obtained up until the highest dose level of 100mg/kg/day at which point an endpoint of CR, PR or SD will be sought(Maximum of 4 dose levels). Defibrotide will be administered in D5W or 0.9% NaCl via IV infusion over 2 hours q6 hours. | Drug | Defibrotide |
Primary outcome
To determine the incidence of grade 3 or 4 adverse events related to defibrotide
Time frame: 100 days
grade 3 and 4 adverse events possible or probably related to defibrotide will be collected
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 15 Apr 2026.
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A Prospective Registry of Pediatric Cellular Therapy Patients at Risk for Endothelial Dysfunction, Sinusoidal Obstruction Syndrome and/or Multi-Organ Dysfunction Syndrome (MODS).
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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.
Mitchell Cairo, MD principal investigator
New York Medical College
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 Sinusoidal Obstruction Syndrome and Veno-occlusive Disease, run by New York Medical College 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 6 inclusion and 5 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: looking for participants now, as of the sponsor's last update on 15 Apr 2026. 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?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Mitchell Cairo, MD (914-594-2150, mitchell_cairo@nymc.edu), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
To determine the incidence of grade 3 or 4 adverse events related to defibrotide (time frame: 100 days). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
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 15 Apr 2026.