131I-apamistamab-based Conditioning for Hematopoietic Stem Cell Transplant (HSCT) in Advanced Sic… (NCT07015684) | Clinical Trial Compass
RecruitingPhase 1
131I-apamistamab-based Conditioning for Hematopoietic Stem Cell Transplant (HSCT) in Advanced Sickle Cell Disease (SCD)
United States24 participantsStarted 2025-04-28
Plain-language summary
The purpose of this study is to find the smallest amount of the 131 I-apamistamab needed for preparing patients with severe sickle cell disease (SCD) for a bone marrow transplant. This is the first time 131 I-apamistamab is being used for advanced Sickle Cell Disease (SCD) in the setting of allogeneic stem cell transplant. 131 I-apamistamab is an investigational product. This means that 131 I-apamistamab has not been approved by the Food and Drug Administration (FDA) for medical use in patients.
The study treatment that is given before the transplant is called the conditioning regimen. In this study, the investigators are adding a drug called 131 I-apamistamab instead of the conditioning regimen typically given before a stem cell transplant.
Who can participate
Age range
12 Years – 50 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion criteria
. Clinically significant neurologic event (stroke) or any neurological deficit lasting at least 24 hours. Stroke will be defined as a clinically significant neurologic event that is accompanied by an infarct on cerebral MRI or cerebral arteriopathy requiring chronic transfusion therapy.
. History of two or more episodes of ACS in the 2-year period preceding enrollment despite supportive care measures (i.e. asthma therapy and/or hydroxyurea).
. History of three or more severe vaso-occlusive pain crises per year in the 2-year period preceding enrollment despite the institution of supportive care measures (i.e. a pain management plan and/or treatment with hydroxyurea).
. Administration of regular RBC transfusion therapy, defined as receiving 8 or more transfusions per year for 1 year or more to prevent vaso-occlusive clinical complications (i.e. pain, stroke, and ACS)
. An echocardiographic finding of tricuspid valve regurgitant jet (TRJ) velocity \> or equal to 2.7 m/sec or pulmonary hypertension diagnosed by right heart catherization.
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
What they're measuring
1
Graft failure rate
Timeframe: 42 days after blood stem cell (PB) transplantation
. Sickle hepatopathy defined as EITHER ferritin \>1000mcg/L OR direct bilirubin \>0.4mg/dl but \<5xULN AND platelet count \<250,000/uL at baseline
. ECOG performance status of 2 or better
. Cardiac function: LVEF of 40% or greater
Exclusion criteria
. Pulmonary dysfunction defined as DLCO (corrected for hemoglobin and alveolar volume) \< 40% of predicted OR baseline oxygen saturation of \<85% or PaO2 \<70.
. Severe cardiac dysfunction defined as ejection fraction \<35%.
. Impaired renal function defined as GFR \<40.
. Hepatic dysfunction defined as bridging (portal to portal) fibrosis or cirrhosis of the liver OR transaminases \>5x ULN for age.
. Clinical stroke within 6 months of anticipated transplant
. Karnofsky performance score \< 50%
. HIV infection
. Uncontrolled viral, bacterial, fungal, or protozoal infection at the time of study enrollment.