Red Cell Half Life Determination in Patients With and Without Sickle Cell Disease
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| ClinicalTrials.gov Identifier: NCT04476277 |
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Recruitment Status :
Active, not recruiting
First Posted : July 20, 2020
Last Update Posted : December 20, 2022
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Background:
Sickle cell disease (SCD) is an inherited blood disorder. It results from a single genetic change (mutation) in red blood cells (RBCs). RBCs are the cells that carry oxygen to the body. In people with SCD, some RBCs are abnormal and die early. This leaves a shortage of healthy RBCs. Researchers want to learn more about how long RBCs live in the human body.
Objective:
To study how long RBCs live in people with and without SCD.
Eligibility:
People age 18 and older who either have SCD, had SCD but were cured with a bone marrow transplant, have the sickle cell trait (SCT), or are a healthy volunteer without SCD or SCT
Design:
Participants will be screened with a medical history and physical exam. They will give a blood sample.
Participants will have a small amount of blood drawn from a vein. In the laboratory, the blood will be mixed with a vitamin called biotin. Biotin sticks to the outside of RBCs without changing their function, shape, or overall lifetime. This process is known as biotin labeling of RBCs. The biotin labeled RBCs will be returned to the participant via vein injection.
Participants will give frequent blood samples. Their RBCs will be studied to see how many biotin labeled RBCs remain over time. This shows how long the RBCs live. Participants will give blood samples until no biotin labeled RBCs can be detected.
During the study visits, participants will report any major changes to their health.
Participation lasts for up to 6 months.
| Condition or disease | Intervention/treatment | Phase |
|---|---|---|
| Sickle Cell Disease Sickle Cell Anemia | Drug: Biotin label | Early Phase 1 |
Study Description:
This study will use biotin-labeling of red blood cells (RBCs) to determine the mean potential lifespan (MPL) of RBCs in patients with sickle cell disease (SCD) compared to patients who have successfully undergone curative bone marrow transplantation (BMT, allogeneic or autologous), participants with sickle cell trait, and healthy donors without SCD. Previous studies have corroborated the MPL of healthy donor RBCs to be approximately 115 days while RBCs from patients with SCD have a much more variable but consistently shorter MPL of approximately 32 days. Allogeneic BMT is a curative therapy for the treatment of severe SCD with stable, mixed donor recipient chimerism after BMT sufficient to reverse the sickle cell phenotype by virtue of improved donor red cell survival compared to the ineffective erythropoiesis of SCD. We predict that the hematologic variables associated with red cell survival among patients with SCD vs. participants with SCT and healthy donors can be used to determine the necessary amount of corrected hemoglobin required to overcome the red cell pathology of SCD. Data generated will be used to determine the utility of performing a population study of RBC lifespan in gene therapy treated patients to ultimately target the percentage of transferred globin gene needed to reverse SCD. The data generated will refine our understanding of the degree of correction necessary to reverse the phenotype of SCD.
Objectives:
Primary Objective: To determine and compare red blood cell survival in patients with SCD, patients with SCD who have undergone BMT, participants with SCT, and healthy donors, and validate the association of red cell survival with known markers of increased red cell survival.
Secondary Objectives: To create a mathematical model incorporating RBC survival and reticulocyte count to determine the necessary amount of normal hemoglobin, and therefore vector copy number or amount of transferred globin, required for gene therapy protocols.
Endpoints:
Primary Endpoint: Red blood cell survival
Secondary Endpoints: Relationship of red blood cell survival to hematologic parameters. Antibody detection to biotin.
| Study Type : | Interventional (Clinical Trial) |
| Actual Enrollment : | 20 participants |
| Allocation: | N/A |
| Intervention Model: | Single Group Assignment |
| Masking: | None (Open Label) |
| Primary Purpose: | Basic Science |
| Official Title: | Red Cell Half Life Determination in Patients With and Without Sickle Cell Disease |
| Actual Study Start Date : | April 19, 2021 |
| Estimated Primary Completion Date : | January 15, 2023 |
| Estimated Study Completion Date : | February 14, 2023 |
| Arm | Intervention/treatment |
|---|---|
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Experimental: 1
Autologous cells will be collected and biotin-labeled ex vivo and reinfused to measure red cell survival
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Drug: Biotin label
Autologous cells will be collected and biotin-labeled ex vivo and reinfused to measure red cell survival |
- To determine and compare red blood cell survival in patients with SCD (HbSS genotype), patients with SCD who have undergone BMT, subjects with SCT, and healthy donors [ Time Frame: 6 months ]Percentage of red blood cells at specific time points as measured by flow cytometry.
- To create a mathematical model incorporating RBC survival and reticulocyte count to determine the necessary amount of normal hemoglobin, and therefore VCN, required for gene therapy protocols [ Time Frame: 18 months ]Design completion of mathematical model
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| Ages Eligible for Study: | 18 Years and older (Adult, Older Adult) |
| Sexes Eligible for Study: | All |
| Accepts Healthy Volunteers: | Yes |
- INCLUSION CRITERIA:
- Age 18 or greater with a confirmed diagnosis of homozygous SCD (HbSS, HbSC, HbSB0), sickle cell trait (HbAS), or healthy volunteer (HbA)
- Normal renal function: creatinine <1.5 mg/dL
- Negative direct antiglobulin test (DAT)
- Ability to give informed consent to participate in the protocol
EXCLUSION CRITERIA:
- Any uncontrolled chronic illness other than sickle cell disease
- Active viral, bacterial, fungal, or parasitic infection
- Consumption of biotin supplements or raw eggs within 30 days
- Blood loss within the previous 8 weeks >540mL
- Pregnancy
- Pre-existing, naturally occurring antibodies against biotin
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04476277
| United States, Maryland | |
| National Institutes of Health Clinical Center | |
| Bethesda, Maryland, United States, 20892 | |
| Principal Investigator: | John F Tisdale, M.D. | National Heart, Lung, and Blood Institute (NHLBI) |
| Responsible Party: | National Heart, Lung, and Blood Institute (NHLBI) |
| ClinicalTrials.gov Identifier: | NCT04476277 |
| Other Study ID Numbers: |
200080 20-H-0080 |
| First Posted: | July 20, 2020 Key Record Dates |
| Last Update Posted: | December 20, 2022 |
| Last Verified: | December 16, 2022 |
| Studies a U.S. FDA-regulated Drug Product: | Yes |
| Studies a U.S. FDA-regulated Device Product: | No |
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Red Cell Survival Biotin Sickle Cell Anemia Sickle Cell Disease Sickle Cell Trait |
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Anemia, Sickle Cell Anemia Hematologic Diseases Anemia, Hemolytic, Congenital Anemia, Hemolytic Hemoglobinopathies |
Genetic Diseases, Inborn Biotin Vitamin B Complex Vitamins Micronutrients Physiological Effects of Drugs |