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Clinical Trial Details — Status: Recruiting

Administrative data

NCT number NCT05329649
Other study ID # VX21-CTX001-151
Secondary ID 2021-002173-26
Status Recruiting
Phase Phase 3
First received
Last updated
Start date May 2, 2022
Est. completion date May 2026

Study information

Verified date February 2024
Source Vertex Pharmaceuticals Incorporated
Contact Medical Information
Phone 617-341-6777
Email medicalinfo@vrtx.com
Is FDA regulated No
Health authority
Study type Interventional

Clinical Trial Summary

This is a single-dose, open-label study in pediatric participants with severe SCD and hydroxyurea (HU) failure or intolerance. The study will evaluate the safety and efficacy of autologous CRISPR-Cas9 modified CD34+ human hematopoietic stem and progenitor cells (hHSPCs) (CTX001).


Recruitment information / eligibility

Status Recruiting
Enrollment 15
Est. completion date May 2026
Est. primary completion date May 2026
Accepts healthy volunteers No
Gender All
Age group 2 Years to 11 Years
Eligibility Key Inclusion Criteria: - Diagnosis of severe SCD as defined by: - Documented SCD genotypes - History of at least two severe VOCs events per year for the previous two years prior to enrollment - Hydroxyurea (HU) failure unless HU intolerant - Eligible for autologous stem cell transplant as per investigators judgment Key Exclusion Criteria: - A willing and healthy 10/10 human leukocyte antigen (HLA)-matched related donor - Prior hematopoietic stem cell transplant (HSCT). - Clinically significant and active bacterial, viral, fungal, or parasitic infection Other protocol defined Inclusion/Exclusion criteria may apply.

Study Design


Intervention

Biological:
CTX001
Administered by intravenous infusion following myeloablative conditioning with busulfan.

Locations

Country Name City State
Germany University Hospital Duesseldorf - Department of Pediatric Oncology, Hematology and Clinical Immunology Dusseldorf
Italy Dipartimento di Onco-Ematologia e Terapia Cellulare e Genica Ospedale Pediatrico Bambino Gesu - IRCCS Rome
United Kingdom St Mary's Hospital London
United States Atrium Health Levine Children's Hospital Charlotte North Carolina
United States St. Jude Children's Research Hospital Memphis Tennessee
United States The Children's Hospital at TriStar Centennial Medical Center/ Sarah Cannon Center for Blood Cancers Nashville Tennessee
United States Children's Hospital of Philadelphia Philadelphia Pennsylvania

Sponsors (2)

Lead Sponsor Collaborator
Vertex Pharmaceuticals Incorporated CRISPR Therapeutics

Countries where clinical trial is conducted

United States,  Germany,  Italy,  United Kingdom, 

Outcome

Type Measure Description Time frame Safety issue
Primary Proportion of Participants who do not Have any Severe Vaso-occlusive Crises (VOCs) for at Least 12 Consecutive Months (VF12) Up to 24 Months After CTX001 Infusion
Secondary Proportion of Participants Free from Inpatient Hospitalization for Severe VOCs for at Least 12 Months (HF12) Up to 24 Months After CTX001 Infusion
Secondary Relative Reduction in Annualized Rate of Severe VOCs From Baseline up to 24 Months After CTX001 Infusion
Secondary Duration of Severe VOC Free in Participants who Have Achieved VF12 Up to 24 Months After CTX001 Infusion
Secondary Relative Reduction in Annualized Rate of Inpatient Hospitalizations for Severe VOCs From Baseline up to 24 Months After CTX001 Infusion
Secondary Proportion of Participants With Sustained Fetal Hemoglobin (HbF) =20 Percent (%) for at Least 3 Months Up to 24 Months After CTX001 Infusion
Secondary Proportion of Participants With Sustained HbF =20% for at Least 6 Months Up to 24 Months After CTX001 Infusion
Secondary Proportion of Participants With Sustained HbF =20% for at Least 12 Months Up to 24 Months After CTX001 Infusion
Secondary Proportion of Alleles With Intended Genetic Modification Present in Peripheral Blood Over Time Up to 24 Months After CTX001 Infusion
Secondary Proportion of Alleles With Intended Genetic Modification Present in CD34+ Cells of the Bone Marrow Over Time Up to 24 Months After CTX001 Infusion
Secondary Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs) From Signing of Informed Consent up to 24 Months After CTX001 Infusion
Secondary Proportion of Participants With Engraftment (First day of 3 Consecutive Measurements of Absolute Neutrophil Count [ANC] =500 per Microliter [mcgL] on 3 Different Days) Within 42 Days After CTX001 Infusion
Secondary Time to Engraftment Up to 24 Months After CTX001 Infusion
Secondary Incidence of Transplant-related Mortality (TRM) Within 100 Days After CTX001 Infusion Within 100 Days After CTX001 infusion
Secondary Incidence of TRM Within 12 Months After CTX001 Infusion Within 12 Months After Infusion
Secondary Incidence of All-cause Mortality From Signing of Informed Consent up to 24 Months After CTX001 Infusion
Secondary Relative Reduction in Annualized Duration of Hospitalization for Severe VOCs From Baseline up to 24 Months After CTX001 Infusion
Secondary Proportion of Participants With Sustained HbF =30% for at Least 3 Months Up to 24 Months After CTX001 Infusion
Secondary Proportion of Participants With Sustained HbF =30% for at Least 6 Months Up to 24 Months After CTX001 Infusion
Secondary Proportion of Participants With Sustained HbF =30% for at Least 12 Months Up to 24 Months After CTX001 Infusion
Secondary Time for Participants to Reach HbF =20% Up to 24 Months After CTX001 Infusion
Secondary Time for Participants to Reach HbF =30% Up to 24 Months After CTX001 Infusion
Secondary Relative Reduction from Baseline in Annualized Volume and Episodes of RBC Transfusions for SCD-related indications starting after Month 12 post-CTX001 infusion Up to 24 Months After CTX001 Infusion
Secondary HbF Concentrations Over Time Up to 24 Months After CTX001 Infusion
Secondary Hemoglobin (Hb) Concentrations Over Time Up to 24 Months After CTX001 Infusion
Secondary Change in Reticulocyte Count Over Time From Baseline up to 24 Months After CTX001 Infusion
Secondary Change in Indirect Bilirubin Over Time From Baseline up to 24 Months After CTX001 Infusion
Secondary Change in Haptoglobin Over Time From Baseline up to 24 Months After CTX001 Infusion
Secondary Proportion of Participants with Detectable Haptoglobin Over Time Up to 24 Months After CTX001 Infusion
Secondary Change in Lactate Dehydrogenase (LDH) Over Time From Baseline (Pre-infusion) up to 24 Months After CTX001 Infusion
Secondary Proportion of Participants with Normalized LDH Over Time Up to 24 Months After CTX001 Infusion
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