T-Cell Depleted, Alternative Donor Transplant in Pediatric and Adult Patients With Severe Sickle Cell Disease (SCD) and Other Transfusion-Dependent Anemias

About the study

The purpose of this study is to evaluate what effect, if any, mismatched unrelated volunteer
donor and/or haploidentical related donor stem cell transplant may have on severe sickle cell
disease and other transfusion dependent anemias. By using mismatched unrelated volunteer
donor and/or haploidentical related donor stem cells, this study will increase the number of
patients who can undergo a stem cell transplant for their specified disease. Additionally,
using a T-cell depleted approach should reduce the incidence of graft-versus-host disease
which would otherwise be increased in a mismatched transplant setting.

Study point of contact

Shawna McIntyre, RN
Paul Szabolcs, MD


1 United States site


5 to 40 Years


Hemoglobin SS


Phase 1/Phase 2

Study type









participation requirements

1. Patient, parent, or legal guardian must have given written informed consent and/or
assent according to FDA guidelines.

2. Ages 5 years to 40 years, at time of consent.

3. Diagnosis of Sickle Cell Disease (Hemoglobin SS, Sβ0-thalassemia) complicated by any
of the following:

– Recurrent acute painful episodes (also known as vaso-occlusive crises; VOC)
despite supportive care, minimum of 2 new pain events per year requiring
hospitalization for parenteral pain management in the previous 2 years.

– Recurrent acute chest syndrome (ACS) despite supportive care, minimum of 2
episodes in preceding 2-year period.

– Stroke or neurologic event lasting > 24 hours with an accompanying infarct on MRI
in any patient for all ages; Brain MRI with silent infarct without clinical event
in patients ≤ 16 years.

– Chronic transfusion therapy defined as > 8 packed red blood cell transfusions per
year in the year prior to enrollment and/or evidence of red blood cell

– Elevated transcranial Doppler velocities – > 200 cm/s, via the non-imaging
technique or > 185 cm/s by the imaging technique measured on 2 separate occasions
≥ 1-month apart

– Elevated TRV > 2.6m/s in patients ≥ 16 years old.

– Sickle-related renal insufficiency and/or sickle hepatopathy and/or any
irreversible end-organ damage in patients ≥ 16 years old.

OR Diagnosis of beta-thalassemia or Diamond-Blackfan anemia complicated by transfusion
dependence with evidence of iron overload.

4. A minimum donor match of 4/8 via high resolution HLA typing at HLA-A, -B, -C, -DRB1
loci in the related setting or minimum donor match of 6/8 via high resolution HLA
typing at HLA-A, -B, -C, -DRB1 loci (with the DRB1 locus as a full match requirement).
An unrelated donor and cord blood search must have been completed without an eligible
8/8 matched unrelated donor or 6/8 cord blood unit available. Patients who may have
acceptable cord blood donor options (4/6 or better) but are limited by cell dose of a
single cord will also be eligible for the proposed study.

5. Adequate function of other organ systems as measured by:

– Creatinine clearance or GFR ≥ 45 ml/min/1.73m.

– Hepatic transaminases (ALT/AST) ≤ 3 x upper limit of normal.

– Liver MR imaging for iron content should be performed in all patients with
Ferritin > 500 ng/mL. If hepatic iron content > 10mg Fe/g liver should have
hepatology consultation and liver biopsy to confirm absence of cirrhosis,
fibrosis or hepatitis.

– Adequate cardiac function as measure by echocardiogram (shortening fraction > 26%
or ejection fraction > 40% or >80% of age-specific normal).

– Pulmonary evaluation testing demonstrating FEV1/FVC ≥ 60% of predicted for age
and/or resting pulse oximeter ≥ 92% on room air.

– Cardiology clearance to proceed with conditioning regimen and HSCT.

– Pulmonology clearance to proceed with conditioning regimen and HSCT.

6. Subjects must be human immunodeficiency virus (HIV) negative by PCR.

7. Negative pregnancy test for females ≥10 years old or who have reached menarche, unless
surgically sterilized.

8. All females of childbearing potential and sexually active males must agree to use an
FDA approved method of birth control for up to 24 months after BMT or for as long as
they are taking any medication that may harm a pregnancy, an unborn child or may cause
a birth defect.

9. Subject and/or parent guardian will also be counseled regarding the potential risks of
infertility following BMT and advised to discuss sperm banking or oocyte harvesting
(Refer to section,

10. Hydroxyurea must have been trialed and failed in patients with sickle cell disease.


participation restrictions

1. Patients with alternate, superior donor options (matched sibling donor or matched
unrelated donor).

2. Patients who have undergone stem cell transplantation in the 6 months prior to
anticipated conditioning.

3. Patients with history of a central nervous system (CNS) event within six months prior
to start of conditioning (patient will be delayed until eligible).

4. Patients who are pregnant or lactating

5. Patients with uncontrolled bacterial, viral or fungal infection

6. Past or current medical problems or findings from physical examination or laboratory
testing that are not listed above, which, in the opinion of the investigator, may pose
additional risks from participation in the study, may interfere with the participant’s
ability to comply with study requirements or that may impact the quality or
interpretation of the data obtained from the study.


  • Pittsburgh, Pennsylvania, United States, Children's Hospital of Pittsburgh of UPMC, 15224 [Recruiting]
Last updated 2021-05-03