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Gaucher Disease, Type 3Phase 2/3NCT05815004

An Efficacy and Safety Study of AVR-RD-02 Compared to Enzyme Replacement Therapy for Treatment of Gaucher Disease Type 3

A Phase 2/3 study testing Gene therapy and Enzyme Replacement Agent in people with Gaucher Disease, Type 3, run by AVROBIO.

Withdrawn

Withdrawn. The study stopped before anyone enrolled.

Official record
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Trial summary

The purpose of this study is to evaluate the efficacy and safety of autologous hemotopoietic stem cell (HSC) gene therapy, AVR-RD-02, compared to enzyme replacement therapy, for the treatment of Gaucher disease Type 3 in male and female participants aged 2 to 25 years. Read more about this study

Who is it for?
Ages 2 to 25 years
Conditions the study is for
Gaucher Disease, Type 3
What is being tested?
Gene therapy and Enzyme Replacement Agent
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
0 participants
Where
No sites listed yet
Study dates
Oct 2023to Dec 2027
Phase
Phase 2/3
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 2 to 25 years
  • All sexes
  • No healthy volunteers
  • Child, Adult

Who may be able to join

  • Participant and/or parent, caregiver, or legal representative must be willing and able to provide written informed consent/assent for the study in accordance with applicable regulations and guidelines and to comply with all study visits and procedures, including the use of any data collection device(s) that may be used to directly record participant data.
  • Participant is ≥2 to ≤ 25 years old, at the time of providing informed consent or assent.
  • Participant has a confirmed diagnosis of Gaucher disease Type 3 based on all of the following:
  • Biallelic GBA1 gene mutation
  • Deficient GCase enzyme activity in blood
  • Clinical phenotype with the presence of gaze palsy, predominantly horizontal and with slow or absent saccades
Show all 19Show fewer
  • Participant has the presence of one or both of the following within 3 months of screening:
  • Ataxia (score ≥1) based on the modified scale for the assessment and rating of ataxia total score (mSARA)
  • Interstitial lung disease (to be confirmed by radiological imaging)
  • Participant has the presence of one or both of the following within 3 months of screening:
  • Hepatomegaly
  • Splenomegaly
  • Participant is on stable prescribed ERT dose for ≥6 consecutive months at the time of Screening.
  • Participant has not received SRT or chaperone therapy for Gaucher disease during the 6 months immediately preceding Screening.
  • Participant is willing to attend all study visits and comply with all study procedures and assessments.
  • Participant is willing to comply with the contraceptive and reproductive requirements.
  • Male and female participants must agree to refrain from donating sperm and eggs, respectively, after undergoing conditioning.
  • Participant must be willing to refrain from donating blood, organs, tissues, or cells for gene therapy infusion any time after AVR-RD-02 treatment.
  • Participant must be willing to receive blood or blood products transfusion to manage AEs as required.

Who cannot join

  • Participant has a diagnosis of Gaucher disease Type 1 or Type 2.
  • Participant has any one of the following:
  • Hemoglobin value of <9.0 g/dL
  • Platelet count of <70 × 109/L
  • Pulmonary hypertension
  • Bone crisis attributable to osteonecrosis and/or pathological fractures within 3 months prior to Screening
Show all 29Show fewer
  • Treatment refractory epilepsy
  • Progressive myoclonic epilepsy
  • Participant has had or is scheduled to undergo a partial or total splenectomy.
  • Participant requires use of invasive ventilatory support.
  • Participant requires use of noninvasive ventilator support while awake for longer than 12 hours daily.
  • Participant has a contraindication to ERT, including a prior anaphylactic or anaphylactoid reaction of any severity to ERT.
  • Busulfan is contraindicated for the participant.
  • Participant has a history of sensitivity to dimethyl sulfoxide.
  • Participant presents with iron, folic acid, and/or vitamin B12 deficiency anemia during Screening.
  • Participant has idiopathic thrombocytopenic purpura (ITP), thrombotic thrombocytopenic purpura (TTP), thrombocytopenia, anemia, hepatomegaly, splenomegaly, and/or osteoporosis, unrelated to Gaucher disease.
  • Participant has a clinical comorbidity, such as neurologic, cardiovascular, pulmonary, hepatic, gastrointestinal, renal, hematologic, endocrine, metabolic, genetic, immunologic, neoplastic, or psychiatric disease, other medical condition(s), or intercurrent illnesses that may confound the study results or may preclude participation in the study.
  • Participant has a prior or current history of cancer. The one exception is a history of resected squamous cell carcinoma.
  • Participant has any other medical condition that predisposes him/her to (or conveys increased risk of) malignancy, in the opinion of the Investigator.
  • Participant has undergone, or is scheduled to undergo, bone marrow, HSC, and/or solid organ transplant.
  • NOTE: Participants who are otherwise eligible for the study but are scheduled for bone marrow transplant or HSC infusion to treat Gaucher disease Type 3 may be enrolled in the study (instead of receiving an allogeneic transplant) and undergo autologous HSC gene therapy with AVR-RD-02.
  • Participant has clinically significant immunosuppressive disease or condition at Screening.
  • Participant is on (or requires treatment with) cytotoxic or immunosuppressive agents from 60 days prior to signing informed consent at Screening (i.e., study enrollment) through the Week 52 study visit; the one exception is treatment with agents required per protocol for autologous HSC infusion.
  • Participant is on (or requires treatment with) red blood cell growth factor (e.g., erythropoietin) from 6 months prior to enrollment (i.e., signing of informed consent at Screening) through the Week 52 study visit.
  • Participant has any condition that makes it impossible to perform magnetic resonance imaging (MRI) studies (including allergies to anesthetics or contrast agents).
  • Participant has medical conditions(s) and/or is receiving medication(s) that would contraindicate ability to undergo mobilization (including contraindication to granulocyte colony stimulating factor [G-CSF] and/or plerixafor), apheresis, or conditioning.
  • Participant has previously received treatment with AVR-RD-02 or any other gene therapy.
  • Participation in (or plan to participate in) any other investigational drug study or plan to be exposed to any other investigational agent, device, and/or procedure from 30 days prior to enrollment (i.e., signing of informed consent at Screening) through study completion.
  • Participant is not suitable for participation as judged by the Investigator, for any reason, including medical or clinical conditions or potential risk of noncompliance to study procedures.

About this study

Official title: Guard3: An Open-label, Parallel-arm, Randomized, Controlled, Phase 2/Phase 3 Study Evaluating the Efficacy and Safety of Autologous HSC Gene Therapy, AVR-RD-02, Compared to ERT for Gaucher Disease Type 3 in Participants Aged 2 to 25

The purpose of this study is to evaluate the efficacy and safety of autologous hemotopoietic stem cell (HSC) gene therapy, AVR-RD-02, compared to enzyme replacement therapy, for the treatment of Gaucher disease Type 3 in male and female participants aged 2 to 25 years.

The study will consist of 2 parts - Core (Part 1) followed by the ERT-crossover (Part 2)

Read the detailed description

Core (Part 1)

Once a participant consents, he/she will complete the screening period within 30 days.

Eligible participants will have baseline assessments completed 30 days later and then will be randomized into one of two treatment arms: AVR-RD-02 arm or ERT control arm.

If randomized to the AVR-RD-02 arm, the participant will enter the pre-gene therapy infusion period (approximately 15 weeks), which consists of mobilization, apheresis, AVR-RD-02 preparation and testing for release, discontinuation of ERT, and conditioning. The participant will then receive the AVR-RD-02 gene therapy (1 day) followed by a 52-week follow-up period in which periodic safety and efficacy assessments will be performed. Participants will not receive ERT after gene therapy infusion unless indicated by pre-specified laboratory and clinical criteria.

If randomized to the ERT Control arm, the participant will remain on their prescribed ERT regimen for 52-week observation period with approximately 4 study visits during this time.

ERT-crossover (Part 2)

After 52 weeks of observation in Part 1, participants in the ERT Control Arm will have the opportunity to enter Part 2 and receive AVR-RD-02. They will start with baseline assessments and follow a similar schedule to the schedule followed by participants assigned to AVR-RD-02 in the Core Study (Part 1).

Being tested
Gene therapy, Enzyme Replacement Agent
Keywords
Gaucher Disease, Gaucher Disease, Type 3, Neuronopathic Gaucher Disease, GD3
Medical subject headings
Gaucher Disease

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Gene therapyDrug

    Also called AVR-RD-02

    AVR-RD-02 Drug product: active substance is autologous CD34+ enriched hematopoietic stem cells (HSCs) that have been genetically modified ex vivo with a lentiviral vector (LV) to contain a ribonucleic acid (RNA) transcript that, after reverse transcription, results in codon-optimized, complementary deoxyribonucleic acid (cDNA) that, upon its integration into human genome, encodes for functional human glucocerebrosidase (GCase)

  • Enzyme Replacement AgentDrug

    Also called Imiglucerase, velaglucerase, taliglucerase alfa

    A hydrolytic lysosomal glucocerebrosidase-specific enzyme

Study groups in NCT05815004
Study groupRoleWhat they receive
AVR-RD-02 ArmExperimentalParticipants will have been on a stable prescribed ERT dose for at least 6 consecutive months at the time of Screening and willing to remain on the same ERT dose until 2 weeks prior to gene therapy infusion.
Receives: Drug: Gene therapy
ERT Control ArmActive comparatorParticipants on stable prescribed ERT dose for at least 6 consecutive months at the time of Screening. Participants will have the opportunity to receive a gene therapy infusion of AVR-RD-02 after week 52 of Part 1.
Receives: Drug: Gene therapy; Drug: Enzyme Replacement Agent

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Change from baseline in a multidomain endpoint as assessed by Global Statistical Test (GST)

    The multidomain endpoint consists of the following 4 domains:

    1. Change in modified Scale for Assessment and Rating of Ataxia total score (mSARA)

    II. Percent change in diffusing capacity of the lung for carbon monoxide (DLco) for the assessment of interstitial lung disease (ILD)

    III. Percent change in spleen volume by Magnetic Resonance Imaging (MRI)

    IV. Percent change in a liver volume by MRI

    Measured: Baseline to 52 weeks post AVR-RD-02 infusion (AVR-RD-02 arm) or Baseline to 52 weeks (ERT arm)

Secondary outcomes (10)
  1. Change from Baseline in Lyso-Gb1 level in cerebrospinal fluid (CSF) as assessed by liquid chromatography tandem mass spectrometry (LC/MS/MS)

    Measured: Baseline to 52 weeks post AVR-RD-02 infusion (AVR-RD-02 arm) or Baseline to 52 weeks (ERT arm)

  2. Change from baseline in clinical improvement as assessed by Clinical Global Impression -Improvement (CGI-I scale)

    Measured: Baseline to 52 weeks post AVR-RD-02 infusion (AVR-RD-02 arm) or Baseline to 52 weeks (ERT arm)

  3. Change from baseline in pain as assessed by Brief Pain Inventory-Short Form (BPI-SF) questionnaire scores

    Measured: Baseline to 52 weeks post AVR-RD-02 infusion (AVR-RD-02 arm) or Baseline to 52 weeks (ERT arm)

  4. Vector Copy Number (VCN) - Engraftment of genetically-modified hematopoietic stem cells (HSCs) in peripheral blood leukocytes (PBL) as assessed by droplet digital polymerase chain reaction (ddPCR)

    Measured: Baseline to 52 weeks post AVR-RD-02 infusion

  5. Vector Copy Number (VCN) - Engraftment of genetically-modified hematopoietic stem cells (HSCs) in bone marrow as assessed by digital droplet polymerase chain reaction (ddPCR)

    Measured: Baseline to 52 weeks post AVR-RD-02 infusion

  6. Incidence of clinically significant AEs and SAEs

    Measured: Baseline to 52 weeks post AVR-RD-02 infusion

  7. Number of participants with clinically relevant abnormalities as assessed by clinical laboratory tests

    Measured: Baseline to 52 weeks post AVR-RD-02 infusion

  8. Number of participants with clinically relevant abnormalities as assessed by vital signs

    Measured: Baseline to 52 weeks post AVR-RD-02 infusion

  9. Number of participants with clinically relevant abnormalities as assessed by electrocardiograms (ECGs)

    Measured: Baseline to 52 weeks post AVR-RD-02 infusion

  10. Number of participants with clinically relevant abnormalities as assessed by physical examinations findings

    Measured: Baseline to 52 weeks post AVR-RD-02 infusion

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted18 Apr 2023
  2. Study startOct 2023 (estimated)
  3. Primary completionDec 2027 (estimated)
  4. Study completionDec 2027 (estimated)

Why it stopped: Further development of programs halted

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2/3
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Model description
Participants, who are randomized to the ERT control arm, will have the opportunity to cross over and receive AVR-RD-02 gene therapy.
Masking
Quadruple blind
Who is masked
Participant, Care provider, Investigator, Outcomes assessor
Enrolment
0 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05815004
Sponsor's protocol ID
AVRO-RD-02-301
Status last verified
Aug 2023
First submitted
3 Apr 2023
Last updated
9 Aug 2023
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
Yes

Questions about this trial

What is this clinical trial studying?

A Phase 2/3 study testing Gene therapy and Enzyme Replacement Agent in people with Gaucher Disease, Type 3, run by AVROBIO.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 19 inclusion and 29 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: withdrawn, as of the sponsor's last update on 9 Aug 2023. Status can change between updates, so confirm with the study contact before making plans.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this combined phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

The study was withdrawn before enrolling participants, so there are no results.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Change from baseline in a multidomain endpoint as assessed by Global Statistical Test (GST) (time frame: Baseline to 52 weeks post AVR-RD-02 infusion (AVR-RD-02 arm) or Baseline to 52 weeks (ERT arm)). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 9 Aug 2023.

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