A Phase 3, Double-blind, Randomized, Placebo-controlled, Multicenter Study of GBT440 Administered Orally to Patients With Sickle Cell Disease

Phase 1

• Conditions: Sickle Cell Disease; MedDRA version: 20.0Level: LLTClassification code 10040644Term: Sickle cell diseaseSystem Organ Class: 100000011951; Therapeutic area: Diseases [C] - Blood and lymphatic diseases [C15]

• Registration Number: EUCTR2016-003370-40-FR
• Lead Sponsor: Global Blood Therapeutics, Inc.

Brief Summary

Not available

Detailed Description

Not available

Study Timeline

• Results First Posted: 1900-01-01
• Study Start: 2017-08-16
• Last Update Posted: 18 March 2020

Recruitment & Eligibility

• Status: ot Recruiting
• Sex: All
• Target Recruitment: 350

Inclusion Criteria

All participants must meet the following inclusion criteria:
1. Male or female study participants with Sickle Cell Disease:
• Documentation of SCD genotype (HbSS, HbSC, HbSß thalassemia or other sickle cell syndrome variants) may be based on history of laboratory testing or must be confirmed by
laboratory testing during screening
2. Participants have had at least 1 episode of VOC in the past 12 months. For study eligibility, VOC is defined as a previously documented episode of ACS or acute painful crisis (for which there was no explanation other than VOC) which required prescription or healthcare professional-instructed use of analgesics for moderate to severe pain (documentation must exist in the patient medical record prior to Screening)
3. Age 12 to 65 years
4. Hemoglobin (Hb) =6.0 and =10.5 g/dL during screening
5. Absolute reticulocyte count and % reticulocyte count must be >1.5 × ULN during Screening
6. For participants taking hydroxyurea (HU), the dose of HU (mg/kg) must be stable for at least 3 months prior to signing the ICF and with no anticipated need for dose adjustments during the study, in the opinion of the Investigator
7. Participants must demonstrate 75% compliance with ePRO measure completion to be enrolled (participants will be given an ePRO device for at least 28 days during Screening; participants who are 60 to 74% compliant can re-screen once with Investigator approval; re-screening is not allowed for participants who are <60% compliant)
8. Participants, who if female and of child bearing potential, are using highly effective methods of contraception from study start to 3 months after the last dose of study drug, and who if male are willing to use barrier methods of contraception, from study start to 3 months after the last dose of study drug
9. Participant has provided documented informed consent or assent (the informed consent form [ICF] must be reviewed and signed by each participant; in the case of pediatric participants, both the consent of the participant’s legal representative or legal guardian, and the participant’s assent must be obtained)
Are the trial subjects under 18? yes
Number of subjects for this age range: 50
F.1.2 Adults (18-64 years) yes
F.1.2.1 Number of subjects for this age range 350
F.1.3 Elderly (>=65 years) no
F.1.3.1 Number of subjects for this age range 0

Exclusion Criteria

Any participant who meets one or more of the following criteria will be excluded from participation:
1. More than 10 VOCs within the past 12 months that required a hospital, emergency room or clinic visit
2. Female who is breast feeding or pregnant
3. Patients who are receiving regularly scheduled blood (RBC) transfusion therapy (also termed chronic, prophylactic, or preventive transfusion) or have received a RBC transfusion for any reason within 28 days of signing the ICF
4. Hospitalized for sickle cell crisis or other vaso-occlusive event within 14 days of signing the ICF
(i.e., a vaso-occlusive event cannot be within 14 days prior to ICF)
5. Hepatic dysfunction characterized by alanine aminotransferase (ALT) >4 × ULN
6. Participants with clinically significant bacterial, fungal, parasitic or viral infection which require therapy:
• Participants with acute bacterial infection requiring antibiotic use should delay screening/enrollment until the course of antibiotic therapy has been completed.
• Participants with known active hepatitis A, B, or C or who are known to be human immunodeficiency virus (HIV) positive
7. Severe renal dysfunction (estimated glomerular filtration rate at the Screening visit; calculated by the central laboratory) <30mL/min/1.73² or on chronic dialysis
8. History of malignancy within the past 2 years prior to treatment Day 1 requiring chemotherapy and/or radiation (with the exception of local therapy for non-melanoma skin malignancy)
9. History of unstable or deteriorating cardiac or pulmonary disease within 6 months prior to consent including but not limited to the following:
• Unstable angina pectoris or myocardial infarction or elective coronary intervention
• Congestive heart failure requiring hospitalization
• Uncontrolled clinically significant arrhythmias
10. Any condition affecting drug absorption, such as major surgery involving the stomach or small intestine (prior cholecystectomy is acceptable)
11. Participated in another clinical trial of an investigational agent (or medical device) within 30 days or 5 half-lives of date of informed consent, whichever is longer, or is currently participating in another trial of an investigational agent (or medical device)
12. Inadequate venous access as determined by the Investigator/site staff
13. Medical, psychological, or behavioral conditions, which, in the opinion of the Investigator, may confound study interpretation, interfere with compliance, or preclude informed consent

Study & Design

• Study Type: Interventional clinical trial of medicinal product
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Secondary Objective: The secondary objectives are to evaluate the effects of GBT440 compared to placebo on SCD symptom exacerbation and TSS from PRO measurement, measures of anemia and hemolysis, and other clinical measures (e.g., VOC, ACS, hospitalization, RBC transfusions, opioid use).;Primary end point(s): Increase in Hb >1 g/dL from Baseline to Week 24.;Timepoint(s) of evaluation of this end point: Day 1, Weeks 2,4,6,8,12,16,20,24,36,48,60,72, EOS(+4weeks);Main Objective: The primary objective is to assess the efficacy of GBT440 in adolescents and adults with Sickle Cell Disease (SCD) as measured by improvement in anemia.