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Protocol Details

Addition of JSP191 (c-kit antibody) to Non-myeloablative Hematopoietic Cell Transplantation For Sickle Cell Disease and Beta-Thalassemia

This study is currently recruiting participants.

Summary | Eligibility | Citations | Contacts




Sponsoring Institute

National Heart, Lung and Blood Institute (NHLBI)

Recruitment Detail

Type: Participants currently recruited/enrolled
Gender: Male & Female
Min Age: 4 Years
Max Age: 100 Years

Referral Letter Required


Population Exclusion(s)



Myeloid Chimerism;
Lymphoid Cells;
Myeloid Cells;
Donor Leukocyte Engraftment;
Non-Myeloablative Conditioning

Recruitment Keyword(s)



Sickle Cell Anemia;
Beta Thalassemia

Investigational Drug(s)

JSP 191 (also known as AMG 191)

Investigational Device(s)



Radiation: TBI
Drug: Hydroxyurea
Biological/Vaccine: briquilimab
Drug: Filgrastim (G-CSF)
Drug: Sirolimus
Biological/Vaccine: Alemtuzumab
Drug: Plerixafor

Supporting Site

National Heart, Lung, and Blood Institute


Sickle cell disease (SCD) is an inherited disorder of the blood. It can damage a person s organs and cause serious illness and death. A blood stem cell transplant is the only potential cure for SCD. Treatments that improve survival rates are needed.


To find out if a new antibody drug (briquilimab, JSP191) improves the success of a blood stem cell transplant


People aged 13 or older who are eligible for a blood stem cell transplant to treat SCD. Healthy family members over age 13 who are matched to transplant recipients are also needed to donate blood.


Participants receiving transplants will undergo screening. They will have blood drawn. They will have tests of their breathing and heart function. They may have chest x-rays. A sample of marrow will be collected from a pelvic bone.

Participants will remain in the hospital about 30 days for the transplant and recovery. They will have a large intravenous line inserted into the upper arm or chest. The line will remain in place for the entire transplant and recovery period. The line will be used to draw blood as needed. It will also be used to administer the transplant stem cells as well as various drugs and blood transfusions. Participants will also receive some drugs by mouth.

Participants must remain within 1 hour of the NIH for 3 months after transplant. During that time, they will visit the clinic up to 2 times a week.

Follow-up visits will include tests to evaluate participants mental functions. They will have MRI scans of their brain and heart.

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Recipient: patients must fulfill one disease category under inclusion criteria 1 and all of criteria 2

1. Patients with sickle cell disease at high risk for disease related morbidity or mortality, defined by having an end-organ damage (A, B, C, D, or E) or complication(s) not ameliorated by SICKLE CELL-SPECIFC THERAPIES (F):

A. Stroke defined as a clinically significant neurologic event that is accompanied by an infarct on cerebral MRI OR an abnormal trans-cranial Doppler examination (>=200 m/s); OR

B. Sickle cell related renal insufficiency defined by a creatinine level >=1.5 times the upper limit of normal (see table below) and kidney biopsy consistent with sickle cell nephropathy OR nephrotic syndrome OR creatinine clearance <60mL/min/1.73m2 for patients <16 years of age or <50mL/min for patients >16 years of age OR requiring peritoneal or hemodialysis. OR

Age (Years) Upper limit of normal serum creatinine (mg/dl)

<= 5 0.8

5 < age <= 10 1.0

10 < age <= 15 1.2

> 15 1.3

C. Tricuspid regurgitant jet velocity (TRV) of >=2.5 m/s in patients >=18 years of age at least 3 weeks after a vaso-occlusive crisis; OR

D. Recurrent tricorporal priapism defined as at least two episodes of an erection lasting >=4 hours involving the corpora cavernosa and corpus spongiosa; OR

E. Sickle hepatopathy defined as EITHER ferritin >1000mcg/L OR direct bilirubin >0.4 mg/dL at baseline in patients >18 years of age; OR

F. Any one of the below complications:

-Complication || Eligible for HSCT

-Vaso-occlusive crises || More than 1 hospital admission per year while on a therapeutic dose of sickle cell treatment /medication

-Acute chest syndrome (ACS) || Any ACS while on sickle cell treatment /medication

-Osteonecrosis of 2 or more joints || And on sickle cell treatment /medication where total hemoglobin increase less than 1 g/dL or fetal hemoglobin increases <2.5 times the baseline level

-Red cell alloimmunization || Total hemoglobin increase <1 g/dL while on therapeutic doses of sickle cell treatment /medication

Patients with beta-thalassemia who have grade 2 or 3 iron overload, determined by the presence of 2 or more of the following:

--portal fibrosis by liver biopsy

--inadequate chelation history (defined as failure to maintain adequate compliance with chelation with deferoxamine initiated within 18 months of the first transfusion and administered subcutaneously for 8-10 hours at least 5 days each week)

--hepatomegaly of greater than 2 cm below the costochondral margin or by other imaging scans

2. Non disease specific

-Ages >=4 years (>=18 years for phase 1 portion of the study)

-6/6 HLA matched family donor available

-Ability to comprehend and willing to sign an informed consent, assent obtained from minors

-Negative serum or urine beta-HCG, when applicable

-Agree to use birth control throughout the study and 12 months after drug product infusion.

--Female subjects must agree to use a medically acceptable method of birth control such as oral contraceptive, intrauterine device, barrier and spermicide, or contraceptive implant/injection from start of screening through 12 months after drug product infusion.

--Male subjects must agree to use effective contraception (including condoms) from start of screening through 12 months after drug product infusion.

3. Patients and Capacity to Consent

-Subject provides informed consent prior to initiation of any study procedures.

-Subject understands and agrees to comply with planned study procedures.

4. Donor

Fully matched human leukocyte antigen (HLA) donors at A, B, C, and DR loci (8 of 8 or 10 of 10) are intended for this study. Donors age 4 or older and >=20 kg, eligible to donate hematopoietic stem cells, who are additionally willing to donate blood for research are eligible for this study. Donors will be evaluated in accordance with existing Standard NIH Policies and Procedures for determination of eligibility and suitability for clinical donation. Note that participation in this study is offered to all eligible donors, but is not required for a donor to make a stem cell donation, so it is possible that not all donors will enroll onto this study.


Recipient exclusion criteria:

-ECOG performance status of 3 or more, or Lanksy performance status of <40 (See Appendix A).

-Diffusion capacity of carbon monoxide (DLCO) <35% predicted (corrected for hemoglobin and alveolar volume). This criterion may be omitted in young children (e.g. near age 5) or other individuals who may have difficulty understanding or complying with instructions of testing.

-Baseline oxygen saturation of <85% or PaO2 <70

-Left ventricular ejection fraction: <35% estimated by ECHO

-Transaminases >5x upper limit of normal for age

-Evidence of uncontrolled bacterial, viral, or fungal infections (currently taking medication and progression of clinical symptoms) within one month prior to starting the conditioning regimen

-Major anticipated illness or organ failure incompatible with survival from PBSC transplant.

-Pregnant or breastfeeding

Donor exclusion criteria:

-Pregnant or breastfeeding

-Cognitively impaired subjects

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Not Provided

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Principal Investigator

Referral Contact

For more information:

John F. Tisdale, M.D.
National Heart, Lung and Blood Institute (NHLBI)
(301) 402-6497

Kelly S. White
National Heart, Lung and Blood Institute (NHLBI)
National Institutes of Health
Building 10
Room 5-1424
10 Center Drive
Bethesda, Maryland 20892
(301) 496-1781

Office of Patient Recruitment
National Institutes of Health Clinical Center (CC)
Building 61, 10 Cloister Court
Bethesda, Maryland 20892
Toll Free: 1-800-411-1222
Local Phone: 301-451-4383
TTY: TTY Users Dial 7-1-1

Clinical Trials Number:


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