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CTX001

Phase 3

Beta-Thalassemia | Monoclonal antibody | Rare Disease |Vertex Pharmaceuticals Incorporated|Last Updated: Aug 11, 2026

Target and mechanism

Molecular targetHBB
Target classGene
ModalityMonoclonal antibody

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMC
Total Trials4
Total Enrollment261

FDA Designations

No designations recorded

Clinical trial landscape

CTX001 · 6 trials · 10 indications

Phase 3 4Phase 2 2
NCT05477563Evaluation of Efficacy and Safety of a Single Dose of CTX001 in Participants With Transfusion-Dependent β-Thalassemia and Severe Sickle Cell DiseaseBeta-Thalassemia
RECRUITING26 Analytics
NCT05356195Evaluation of Safety and Efficacy of CTX001 in Pediatric Participants With Transfusion-Dependent β-Thalassemia (TDT)Beta-Thalassemia
ACTIVE NOT_RECRUITING16 Analytics
NCT05329649Evaluation of Safety and Efficacy of CTX001 in Pediatric Participants With Severe Sickle Cell Disease (SCD)Sickle Cell Disease
ACTIVE NOT_RECRUITING13 Analytics
NCT04208529A Long-term Follow-up Study in Participants Who Received CTX001Beta-Thalassemia
ENROLLING BY_INVITATION160 Analytics
PHASE3RECRUITING
Evaluation of Efficacy and Safety of a Single Dose of CTX001 in Participants With Transfusion-Dependent β-Thalassemia and Severe Sickle Cell Disease
Beta-ThalassemiaUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
Evaluation of Safety and Efficacy of CTX001 in Pediatric Participants With Transfusion-Dependent β-Thalassemia (TDT)
Beta-ThalassemiaUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
Evaluation of Safety and Efficacy of CTX001 in Pediatric Participants With Severe Sickle Cell Disease (SCD)
Sickle Cell DiseaseUnlock trial analytics
PHASE3ENROLLING BY_INVITATION
A Long-term Follow-up Study in Participants Who Received CTX001
Beta-ThalassemiaUnlock trial analytics

Study Endpoints

Primary Endpoints

Fetal Hemoglobin (HbF) Concentration Over Time
Up to 12 Months After CTX001 Infusion
Total Hemoglobin (Hb) Concentration Over Time
Up to 12 Months After CTX001 Infusion
Proportion of Participants who Achieve Transfusion Independence for at Least 12 Consecutive Months (TI12)
Up to 24 Months After CTX001 Infusion
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
New malignancies
Signing of informed consent up to 15 years post CTX001 infusion
New or worsening hematologic disorders
Signing of informed consent up to 15 years post CTX001 infusion
All-cause mortality
Signing of informed consent up to 15 years post CTX001 infusion
Serious adverse events (SAEs)
Signing of informed consent up to 15 years post CTX001 infusion
CTX001-related adverse events (AEs)
Signing of informed consent up to 15 years post CTX001 infusion
Proportion of subjects who have not experienced any severe vaso-occlusive crisis (VOC) for at least 12 consecutive months (VF12)
From 60 days after last RBC transfusion up to 2 years after CTX001 infusion
Proportion of subjects with engraftment (first day of three consecutive measurements of absolute neutrophil count [ANC] ≥500/µL on three different days)
Within 42 days after CTX001 infusion
Time to engraftment
From CTX001 infusion up to 2 years after CTX001 infusion
Frequency and severity of collected adverse events (AEs)
From screening to 2 years after CTX001 infusion
Incidence of transplant-related mortality (TRM) within 100 days after CTX001 infusion
Within 100 days after CTX001 infusion
Incidence of TRM within 1 year after CTX001 infusion
Within 1 year after CTX001 infusion
Proportion of participants achieving transfusion independence for at least 12 consecutive months (TI12)
From 60 days after last RBC transfusion up to 24 months post-CTX001 infusion]
Proportion of participants with engraftment (first day of 3 consecutive measurements of absolute neutrophil count [ANC] ≥500/µL on three different days)
Within 42 days after CTX001 infusion
Time to neutrophil and platelet engraftment
Days post-infusion to engraftment
Incidence of transplant-related mortality (TRM)
Baseline (pre-transfusion) to 100 days and 1 year post-CTX001 infusion

Secondary Endpoints

TDT and SCD: Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)
From Signing of Informed Consent up to 12 Months After CTX001 Infusion
TDT and SCD: 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
TDT and SCD: Time to Engraftment
Up to 12 Months After CTX001 Infusion
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
CTX001EXPERIMENTALCTX001 (autologous CD34+ hHSPCs modified with CRISPR-Cas9 at the erythroid lineage-specific enhancer of the BCL11A gene). Participants will receive a single infusion of CTX001 through a central venous catheter.

Interventions

NameTypeDescription
CTX001BIOLOGICALAdministered by intravenous (IV) infusion following myeloablative conditioning with busulfan
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Eligibility Criteria

Age Range12 Years to 35 Years
SexALL
Healthy VolunteersNo
Study Sites6

Key Inclusion Criteria: * Participants with TDT and SCD: * Eligible for autologous stem cell transplant as per investigator's judgment. * Participants with TDT: * Diagnosis of TDT as defined by: * Documented homozygous β-thalassemia or compound heterozygous β-thalassemia including β-thalassemia/hem...

Countries:United StatesGermanyItalySaudi ArabiaCanadaUnited KingdomBelgiumFrance
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Recent Changes (Last 90 Days)

LOWAug 11, 2026NCT04208529lastUpdatePostDate: changed
LOWAug 11, 2026NCT04208529lastUpdatePostDate: changed
MEDIUMJul 2, 2026NCT05356195primaryCompletionDate: changed
MEDIUMJul 2, 2026NCT05329649primaryCompletionDate: changed
MEDIUMJul 2, 2026NCT05356195primaryCompletionDate: changed
MEDIUMJul 2, 2026NCT05329649primaryCompletionDate: changed
MEDIUMJul 2, 2026NCT05356195primaryCompletionDate: changed
MEDIUMJul 2, 2026NCT05329649primaryCompletionDate: changed
MEDIUMJul 2, 2026NCT05356195primaryCompletionDate: changed
MEDIUMJul 2, 2026NCT05329649primaryCompletionDate: changed

Frequently asked questions about CTX001

What is CTX001 used for?

CTX001 is an investigational therapy being developed for sickle cell disease and transfusion-dependent beta-thalassemia. It is a gene-edited cell therapy that targets the HBB gene. The drug is currently in Phase 3 clinical development for these rare blood disorders.

What does CTX001 target?

CTX001 targets the HBB gene, which encodes the beta-globin subunit of hemoglobin. By editing this gene, the therapy aims to address the underlying genetic cause of sickle cell disease and beta-thalassemia. The drug is designed as a one-time treatment for these inherited blood disorders.

Who makes CTX001?

CTX001 is being developed by Vertex Pharmaceuticals Incorporated, a biopharmaceutical company traded on the NASDAQ under the ticker symbol VRTX. The company is conducting Phase 3 clinical trials to evaluate the safety and efficacy of this investigational therapy for sickle cell disease and beta-thalassemia.

What phase is CTX001 in?

CTX001 is in Phase 3 clinical development. It is an investigational therapy and has not been approved by regulatory authorities. The drug is being studied for the treatment of sickle cell disease and transfusion-dependent beta-thalassemia in multiple ongoing clinical trials.

What clinical trials is CTX001 in?

CTX001 is being evaluated in several clinical trials, including NCT04208529, a long-term follow-up study in participants who received the drug, and NCT05356195, a Phase 3 study in pediatric participants with transfusion-dependent beta-thalassemia. NCT05477563 is a Phase 3 trial in participants with beta-thalassemia and severe sickle cell disease.

Is CTX001 the same as exagamglogene autotemcel?

CTX001 is also known by the nonproprietary name exagamglogene autotemcel. It is an investigational gene-edited cell therapy being developed by Vertex Pharmaceuticals for sickle cell disease and transfusion-dependent beta-thalassemia. The drug is currently in Phase 3 clinical trials.