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TerminatedNCT04091737Updated Jun 18, 2021

CSL200 Gene Therapy in Adults With Severe Sickle Cell Disease

A Phase 1 interventional study of Autologous enriched CD34+ cell fraction that contains CD34+ cells transduced with lentiviral vector encoding human γ-globinG16D and short-hairpin RNA734 in Anemia, Sickle Cell, sponsored by CSL Behring. Terminated at 1 site in United States. Open to participants aged 18 Years to 45 Years. Per ClinicalTrials.gov, last updated 2021-06-18.

Sponsored by CSL Behring · Phase 1, Interventional, and Treatment

Why this study was terminated
Unanticipated delays, not for safety reasons

From the registry’s dates

  • Primary completion was May 2021, 5 years 5 months ago, and no results have been posted to the registry.
Phase
Phase 1
Study type
Interventional
Enrollment
1
Allocation
Not applicable
Ages
18 Years to 45 Years
Sex
All
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Study summary

This is a phase 1 pilot study of CSL200 in adult subjects with severe sickle cell disease. The primary objectives of this study are to evaluate the safety of the following: collection of CD34+ hematopoietic stem / progenitor cells by apheresis after mobilization with plerixafor, reduced intensity conditioning with melphalan, and administration of CSL200.

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Conditions studied

  • Anemia, Sickle Cell

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03

In context

Anemia, Sickle Cell

1,104 studies on the registry are indexed under Anemia, Sickle Cell; 236 are open to participants now.

This study's enrollment of 1 is below the median of 40 across 750 interventional studies indexed under Anemia, Sickle Cell.

Browse Anemia, Sickle Cell studies →

Lead sponsor

CSL Behring is the lead sponsor of 142 studies on the registry; 18 are open to participants now.

Of its 24 completed or terminated interventional studies of FDA-regulated products, 17 (71%) have results posted.

Counted across the registry records on this site, refreshed daily.

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Who can participate

Ages eligible
18 Years to 45 Years
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • Diagnosis of sickle cell disease with the homozygous HbS homozygous genotype (HbSS) or an HbSβ thalassemia variant (ie, HbSβ0 thalassemia or HbSβ+ thalassemia) genotype, confirmed by hemoglobin studies.
  • Fetal hemoglobin (HbF) ≤ 15%.
  • Severe sickle cell disease symptomatology, defined as any one or more of the following:

    1. ≥ 2 episodes of acute chest syndrome in the last 2 years.
    2. ≥ 3 episodes of severe pain events requiring a visit to a medical facility and treatment with opioids in the last 2 years.
    3. > 2 episodes of recurrent priapism in the last 2 years.
    4. Red-cell alloimmunization (> 2 antibodies) during long-term transfusion therapy (lifetime history).
    5. Chronic transfusions for primary or secondary prophylaxis (lifetime history).
    6. Trans-thoracic echocardiograph evidence of tricuspid valve regurgitant jet velocity ≥ 2.7 m/sec (lifetime history).
    7. Clinically significant neurologic event (eg, ischemic stroke) or any neurological deficit lasting > 24 hours.
  • Not eligible for human leukocyte antigen (HLA)-matched hematopoietic stem cell transplantation, defined as follows: no medically eligible, available, and willing 10/10 matched HLA-identical sibling donor, unless subject has declined this treatment option (as documented in the informed consent form).
  • Not eligible for, declined, or, as judged by the investigator, failed therapy with hydroxyurea and if still on hydroxyurea is able to interrupt hydroxyurea starting at the beginning of the transfusions, before mobilization and apheresis.

Exclusion criteria

Exclusion Criteria:

  • Hypoxanthine-guanine phosphoribosyl transferase (HPRT) deficiency.
  • Thiopurine S-methyltransferase (TPMT) deficiency.
  • Alpha thalassemia.
  • Inadequate bone marrow function, defined as at least 1 of the following:

    1. Absolute neutrophil count \< 1000/µL.
    2. Platelet count \< 120,000/µL.
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Study design

Phase
Phase 1
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
1 participant (actual)

Study arms

  • Experimental
    CSL200

    Autologous enriched CD34+ cell fraction that contains CD34+ cells transduced with lentiviral vector encoding human γ-globinG16D and short-hairpin RNA734

    Biological: Autologous enriched CD34+ cell fraction that contains CD34+ cells transduced with lentiviral vector encoding human γ-globinG16D and short-hairpin RNA734

Interventions

  • BiologicalAutologous enriched CD34+ cell fraction that contains CD34+ cells transduced with lentiviral vector encoding human γ-globinG16D and short-hairpin RNA734

    * Cryopreserved formulated autologous enriched CD34+ cell fraction that contains CD34+ cells transduced with lentiviral vector encoding human γ-globinG16D and short-hairpin RNA734 in a bag for infusion * Plerixafor to mobilize hematopoietic stem cells prior to each apheresis * Single dose melphalan before administration of CSL200

    Also known as: CSL200

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What researchers measure

Primary outcomes

  1. Number of adverse events (AEs), serious adverse events (SAEs), and adverse events of special interest (AESIs) associated with the administration of CSL200

    Adverse event (AE) is defined as any untoward medical occurrence in a patient or clinical investigation subject administered a pharmaceutical product and which does not necessarily have a causal relationship with this treatment. Serious adverse event (SAE) is defined as any untoward medical occurrence that at any dose results in death, is life-threatening, requires in-patient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability or incapacity, or is medically significant. Adverse event of special interest (AESI) is defined in this study as any of the following: acute immune reactions, autoimmunity to CSL200; malignancy; predominant integration site in presence of malignancy or other abnormality.

    Time frame: Up to 48 weeks

  2. Number of subjects experiencing AEs, SAEs, and AESIs associated with the administration of CSL200

    Time frame: Up to 48 weeks

  3. Number of AEs, SAEs, and AESIs associated with the collection of CD34+ HSPCs by apheresis after mobilization with plerixafor

    Time frame: Up to 6 weeks

  4. Number of subjects experiencing AEs, SAEs, and AESIs associated with the collection of CD34+ HSPCs by apheresis after mobilization with plerixafor

    Time frame: Up to 6 weeks

  5. Number of AEs, SAEs, and AESIs associated with reduced intensity conditioning with melphalan

    Time frame: Up to 3 weeks

  6. Number of subjects experiencing AEs, SAEs, and AESIs associated with reduced intensity conditioning with melphalan

    Time frame: Up to 3 weeks

Secondary outcomes

  1. Total by-subject number of CD34+ HSPCs collected in total and in each apheresis session

    Collection of CD34+ HSPCs by apheresis after mobilization with plerixafor assessed by CD34+ HSPCs collected

    Time frame: Up to 2 days

  2. Number of subjects receiving plerixafor and number of plerixafor doses administered by subject

    Collection of CD34+ HSPCs by apheresis after mobilization with plerixafor assessed by plerixafor administrations

    Time frame: Up to 2 days

  3. Number of subjects undergoing apheresis and number of apheresis sessions by subject

    Collection of CD34+ HSPCs by apheresis after mobilization with plerixafor assessed by apheresis sessions

    Time frame: Up to 2 days

  4. The number of subjects undergoing reduced intensity conditioning with melphalan and able to receive CSL200

    Reduced intensity conditioning assessed by subjects receiving melphalan

    Time frame: 2 days

  5. Number of subjects receiving CSL200

    Time frame: 1 day

  6. By-subject number of separate CSL200 drug products administered

    Time frame: 1 day

  7. Number of CSL200 CD34+ HSPCs/kg administered by subject and by CSL200 drug product

    Time frame: 1 day

  8. By-subject total number and percentage of CD34+ HSPCs transduced with CAL-H

    Time frame: Up to 48 weeks

  9. Vector copy number (VCN)

    VCN will be determined by using the average number of CAL-H vector genomes per cell

    Time frame: Up to 48 weeks

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Study locations

1 site
  • City of Hope Medical Center
    Duarte, California 91010, United States
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References and documents

Individual participant data

Plan to share: Yes — CSL will consider requests to share Individual Patient Data (IPD) from systematic review groups or bona-fide researchers. For information on the process and requirements for submitting a voluntary data sharing request for IPD, please contact CSL at clinicaltrials@cslbehring.com. Applicable country specific privacy and other laws and regulations will be considered and may prevent sharing of IPD. If the request is approved and the researcher has executed an appropriate data sharing agreement, IPD that has been appropriately anonymized will be available.

Supporting information: Study protocol, Sap

No publications or documents are linked to this record.

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Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jun 18, 2021, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT04091737
Lead sponsor
CSL Behring
Responsible party
Sponsor
First posted
Sep 17, 2019
Start date
Oct 2, 2019
Primary completion
May 5, 2021
Completion
May 5, 2021
Last update
Jun 18, 2021

Study contacts

Study Director
study director · CSL Behring

Oversight

Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is terminated, as verified in Jun 2021. You cannot join it, but the record below documents what was studied.

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