CSL200 Gene Therapy in Adults With Severe Sickle Cell Disease

Phase 1

Terminated

• Conditions: Anemia, Sickle Cell
• Interventions: Biological: Autologous enriched CD34+ cell fraction that contains CD34+ cells transduced with lentiviral vector encoding human γ-globinG16D and short-hairpin RNA734

• Registration Number: NCT04091737
• Lead Sponsor: CSL Behring

Brief 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.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2019-09-13
• Study First Submitted QC: 2019-09-13
• Study First Posted: 2019-09-17
• Study Start: 2019-10-02
• Primary Completion: 2021-05-05
• Study Completion: 2021-05-05
• Status Verified: 2021-06
• Last Update Submitted: 2021-06-14
• Last Update Posted: 2021-06-18

Recruitment & Eligibility

• Status: TERMINATED
• Sex: All
• Target Recruitment: 1

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.

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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

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
CSL200	Autologous enriched CD34+ cell fraction that contains CD34+ cells transduced with lentiviral vector encoding human γ-globinG16D and short-hairpin RNA734	Autologous enriched CD34+ cell fraction that contains CD34+ cells transduced with lentiviral vector encoding human γ-globinG16D and short-hairpin RNA734

Primary Outcome Measures

Name	Time	Method
Number of AEs, SAEs, and AESIs associated with reduced intensity conditioning with melphalan	Up to 3 weeks
Number of AEs, SAEs, and AESIs associated with the collection of CD34+ HSPCs by apheresis after mobilization with plerixafor	Up to 6 weeks
Number of subjects experiencing AEs, SAEs, and AESIs associated with the collection of CD34+ HSPCs by apheresis after mobilization with plerixafor	Up to 6 weeks
Number of subjects experiencing AEs, SAEs, and AESIs associated with reduced intensity conditioning with melphalan	Up to 3 weeks
Number of adverse events (AEs), serious adverse events (SAEs), and adverse events of special interest (AESIs) associated with the administration of CSL200	Up to 48 weeks	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.
Number of subjects experiencing AEs, SAEs, and AESIs associated with the administration of CSL200	Up to 48 weeks

Secondary Outcome Measures

Name	Time	Method
Number of CSL200 CD34+ HSPCs/kg administered by subject and by CSL200 drug product	1 day
By-subject total number and percentage of CD34+ HSPCs transduced with CAL-H	Up to 48 weeks
The number of subjects undergoing reduced intensity conditioning with melphalan and able to receive CSL200	2 days	Reduced intensity conditioning assessed by subjects receiving melphalan
By-subject number of separate CSL200 drug products administered	1 day
Number of subjects receiving plerixafor and number of plerixafor doses administered by subject	Up to 2 days	Collection of CD34+ HSPCs by apheresis after mobilization with plerixafor assessed by plerixafor administrations
Total by-subject number of CD34+ HSPCs collected in total and in each apheresis session	Up to 2 days	Collection of CD34+ HSPCs by apheresis after mobilization with plerixafor assessed by CD34+ HSPCs collected
Number of subjects undergoing apheresis and number of apheresis sessions by subject	Up to 2 days	Collection of CD34+ HSPCs by apheresis after mobilization with plerixafor assessed by apheresis sessions
Number of subjects receiving CSL200	1 day
Vector copy number (VCN)	Up to 48 weeks	VCN will be determined by using the average number of CAL-H vector genomes per cell

Trial Locations

Locations (1)

City of Hope Medical Center; 🇺🇸 Duarte, California, United States