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Study to Evaluate the Effect of GBT440 on TCD in Pediatrics With Sickle Cell Disease (HOPE Kids 2)

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ClinicalTrials.gov Identifier: NCT04218084
Recruitment Status : Recruiting
First Posted : January 6, 2020
Last Update Posted : December 24, 2020
Sponsor:
Information provided by (Responsible Party):
Global Blood Therapeutics

Study Description
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Brief Summary:
This study is a Phase 3, randomized, double-blind, placebo-controlled study of voxelotor in pediatric participants, aged ≥ 2 to < 15 years old, with Sickle Cell Disease. The primary objective is to evaluate the effect of voxelotor on the TCD (Transcranial Doppler Ultrasound) measurements in SCD participants in this age range.

Condition or disease Intervention/treatment Phase
Sickle Cell Disease Drug: Voxelotor Drug: Placebos Phase 3

Expanded Access : Global Blood Therapeutics has indicated that access to an investigational treatment associated with this study is available outside the clinical trial.  

Detailed Description:
This study is a Phase 3, randomized, double-blind, placebo-controlled study of voxelotor in pediatric participants, aged ≥ 2 to < 15 years old, with Sickle Cell Disease. The study will be conducted at approximately 50 international clinical sites, and will enroll approximately 224 participants. Participants will be randomized in a 1:1 ratio to receive voxelotor or placebo. All participants younger than 12 years of age and randomized to voxelotor will receive a dose based on their body weight, to provide exposure corresponding to the adult dose of 1500 mg/day.
Study Design
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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 224 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Masking Description: Double-Blind, Placebo-Controlled
Primary Purpose: Treatment
Official Title: A Phase 3, Randomized, Double-Blind, Placebo-Controlled Study of Voxelotor (GBT440) in Pediatric Participants With Sickle Cell Disease
Actual Study Start Date : February 3, 2020
Estimated Primary Completion Date : March 2026
Estimated Study Completion Date : March 2026

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Arms and Interventions
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Arm Intervention/treatment
Experimental: Voxelotor
Voxelotor 1500mg or equivalent daily as a tablet or as powder for oral suspension.
 Drug: Voxelotor
Participants are randomized 1:1 to receive voxelotor or placebo.
Placebo Comparator: Placebo
Matching placebo.
 Drug: Placebos
Matching placebo.


Outcome Measures
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Primary Outcome Measures :
  1. TCD Measurement [ Time Frame: 24 weeks ]
    The change in time averaged maximum of the mean velocity (TAMMV) arterial cerebral blood flow, as measured by TCD.


Secondary Outcome Measures :
  1. Change in TCD Flow Velocity [ Time Frame: 48 and 96 weeks ]
  2. Conversion to Abnormal TCD Flow Velocity [ Time Frame: 24, 48, and 96 weeks ]
    Incidence of conversion to abnormal TCD flow velocity (≥ 200 cm/sec)

  3. Reversion to Normal TCD Flow Velocity [ Time Frame: 24, 48, and 96 weeks ]
    Incidence of reversion to normal TCD flow velocity (<170 cm/sec)

  4. TCD Flow Velocity Reduction [ Time Frame: 24, 48, and 96 weeks ]
    Proportion of participants with TCD flow velocity reduction ≥ 15 cm/sec

  5. Number of Participants with Change in Hemoglobin (Hb) [ Time Frame: 24, 48, and 96 weeks ]
  6. Change in Unconjugated Bilirubin [ Time Frame: 24, 48 and 96 weeks ]
  7. Change in Percent of Reticulocyte [ Time Frame: 24, 48, and 96 weeks ]
  8. Change in Absolute Reticulocyte [ Time Frame: 24, 48, and 96 weeks ]
  9. Change in Lactate Dehydrogenase (LDH) [ Time Frame: 24, 48, and 96 weeks ]

Eligibility Criteria
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Ages Eligible for Study:   2 Years to 14 Years   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  1. Male or female participants with Sickle Cell Anemia (SCA)
  2. TCD time averaged maximum of the mean velocity (TAMMV) arterial cerebral blood flow ≥ 170 to < 200cm/sec during the Screening Period
  3. Hb ≥ 5.5 and ≤ 10.5 g/dL during screening
  4. For participants taking HU, the dose of HU (mg/kg) must be stable for at least 90 days prior to signing the informed consent form (ICF) and/or assent form, and with no anticipated need for dose adjustments (other than weight based) or for initiation of HU for non-chronic use during the study, in the opinion of the Investigator
  5. Written informed parental/guardian consent and participant assent (where applicable) has been obtained per IRB/EC policy and requirements, consistent with ICH guidelines.

Exclusion Criteria:

  1. Body weight < 5kg at the screening visit
  2. Hospitalization for VOC or acute chest syndrome (ACS) within the 14 days prior to execution of informed consent/assent (see Section 7.2.5.1 for the definition of VOC).
  3. More than 10 VOCs within the past 12 months that required hospitalization, emergency room, or clinic visit
  4. Stroke resulting in focal neurological deficit; previous silent infarcts are permitted.
  5. Known history or findings, including screening magnetic resonance imaging (MRI)/magnetic imaging angiography (MRA) findings, suggestive of significant cerebral vasculopathy (eg, moyamoya or significant vasculopathy)
  6. History of seizure disorder (History of febrile seizures is permissible if there have been no seizures within the 12 months prior to randomization).
  7. Has been treated with erythropoietin or other hematopoietic growth factors within 28 days of signing informed consent/assent or if, in the opinion of the Investigator, there is an anticipated need for such agents during the study
  8. RBC transfusion therapy (also termed chronic, prophylactic, or preventative transfusion) or has received an RBC transfusion or exchange transfusion for any reason within 90 days of signing the informed consent/assent
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04218084


Contacts
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Contact: Margaret Tonda, PharmD (650) 741-7761 mtonda@gbt.com
Contact: Jenni Herber (650) 826-2422 jherber@gbt.com

Locations
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Sponsors and Collaborators
Global Blood Therapeutics
More Information
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Responsible Party: Global Blood Therapeutics
ClinicalTrials.gov Identifier: NCT04218084    
Other Study ID Numbers: GBT440-032
First Posted: January 6, 2020    Key Record Dates
Last Update Posted: December 24, 2020
Last Verified: December 2020

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Global Blood Therapeutics:
Sickle Cell Disease
Transcranial Doppler Ultrasound (TCD)
Additional relevant MeSH terms:
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Anemia, Sickle Cell
Anemia, Hemolytic, Congenital
Anemia, Hemolytic
Anemia
 Hematologic Diseases
Hemoglobinopathies
Genetic Diseases, Inborn