Evaluation of Different Dose Regimens of Aes-103 Given for 28 Days to Subjects With Stable Sickle Cell Disease

Sickle Cell Disease Clinical Trial

Official title:

A Phase 2, Exploratory, Placebo-Controlled, Multicenter, Double-Blind Evaluation of the Safety, Pharmacokinetics, Pharmacodynamics, and Clinical Effects of Two Dose Regimens of Aes-103 Given for 28 Days to Subjects With Stable Sickle Cell Disease

Clinical Trial Details — Status: Terminated

Administrative data

• NCT number: NCT01987908
• Other study ID #: Aes-103-003
• Secondary ID: 3214012013-00153
• Status: Terminated
• Phase: Phase 2
• Start date: December 3, 2013
• Est. completion date: March 16, 2015

Study information

• Verified date: May 2021
• Source: Takeda
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Sickle cell disease (SCD) is a genetic blood disorder characterized by the presence of sickle-shaped red blood cells. In the U.S. and the U.K. this occurs primarily in persons of African origin. There is only one drug (hydroxyurea) approved to manage SCD, but it is not fully efficacious and can produce medically significant side effects. Aes-103 is being evaluated as a novel agent for the long term management of SCD. By directly reducing the sickling process, Aes-103 has a different mechanism of action than hydoxyurea. The active ingredient in Aes-103 is 5-hydroxymethyl furfural, a naturally occurring small molecule that is chemically related to glucose. This study will evaluate the safety and pharmacokinetic profile of two dosing regimens of Aes-103 for up to 28 days in up to 50 adult subjects with stable SCD compared with subjects receiving placebo.

Description:

This study will evaluate evaluate in subjects with stable SCD the safety, pharmacokinetic profile, clinical pharmacology actions and clinical activities of two dosing regimens of Aes-103 (1000 mg four times daily in Cohort A and a higher or lower dose given once daily or up to four times daily in Cohort B) given for up to 28 days in adult subjects with stable SCD compared with subjects receiving placebo.

Recruitment information / eligibility

• Status: Terminated
• Enrollment: 35
• Est. completion date: March 16, 2015
• Est. primary completion date: March 16, 2015
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years to 60 Years

Eligibility

Inclusion Criteria:

• Male or female, aged 18-60 years old, inclusive
• Diagnosis of SCD (hemoglobin SS) without hospitalization for pain crises or any other reason in the 14 days before enrollment
• Have normal organ function as defined by direct bilirubin <1.1 mg/dL (19 µmol/L), alanine transaminase (serum glutamic pyruvic transaminase) =120 IU/L, and Creatinine =1.3 mg/dL (115 µmol/L)
• Have at least one of the following baseline values: hemoglobin level of <10 g/dL, numerical pain rating scale (NPRS) score of = 4, or 6-minute walk distance (6MWD) of <500 m
• If female, be nonpregnant and nonbreastfeeding and be surgically sterile or using an acceptable method of contraception throughout the study and for 3 months after the last dose of study medication
• Have completed an outpatient screening visit consisting of medical history, physical examination, 12-lead electrocardiogram (ECG), vital signs, hematology and chemistry tests, urinalysis, urine drug screen, urine or serum pregnancy test (females), hemoglobin electrophoresis, hepatitis B and C screening, and HIV serology
• Be able to understand and have provided written informed consent including signature on an informed consent form approved by an institutional review board or independent ethics committee
• Have provided written authorization for use and disclosure of protected health information
• Agree to abide by the study schedule and to return for the required assessments

Exclusion Criteria:

• Have been hospitalized in the 14 days before enrollment, for any reason
• Have evidence of clinically significant cardiovascular, respiratory, renal, hepatic, pulmonary, gastrointestinal, hematological, neurological, psychiatric, or other disease that may interfere with the objectives of the study or the safety of the subject, or have been hospitalized in the past 6 months as a result of these conditions (for SCD-related morbidity, a minimum of 14 days from the last hospitalization is required)

Related Conditions & MeSH terms

• Anemia, Sickle Cell
• Sickle Cell Disease

Intervention

Drug:
• Aes-103
The active ingredient in Aes-103 is 5-hydroxymethyl furfural (5-HMF). Aes-103 and matching placebo are administered in a liquid oral formulation.

Other:
• Placebo

Locations

Country	Name	City	State
United Kingdom	Quintiles Ltd. - Quintiles Drug Research Unit, 6 Newcomen Street	London

Sponsors (1)

Lead Sponsor	Collaborator
Baxalta now part of Shire

Country where clinical trial is conducted

United Kingdom, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Number of Participants With Adverse Events, Including Sickle Cell-specific Symptoms, During the Double-blind Treatment Period	Number of participants with adverse events (AEs) reported during the double-blind treatment period. AEs included clinically-significant changes in vital signs, ECG, clinical laboratory assessments, physical and neurological examinations. Sickle cell-specific symptoms included the development of new skin ulcers, hospitalization or ambulatory acute care, intravenous analgesics visit for pain episodes (i.e., sickle-cell disease related pain), acute chest syndrome, priapism, and stroke.	Double-blind treatment period of 28 days (Day 1 to Day 28)
Primary	Number of Participants With Adverse Events, Including Sickle-cell Specific Symptoms, During the Placebo lead-in Period	Number of participants with adverse events (AEs) reported during the placebo lead-in period. AEs included clinically-significant changes in vital signs, ECG, clinical laboratory assessments, physical and neurological examinations. Sickle cell-specific symptoms included the development of new skin ulcers, hospitalization or ambulatory acute care, intravenous analgesics visit for pain episodes (i.e., sickle-cell disease related pain), acute chest syndrome, priapism, and stroke.	Placebo lead-in period of 14 days (Day -14 to Day -1)
Primary	Number of Participants With Adverse Events, Including Sickle-cell Specific Symptoms, During the Post-treatment Observation Period	Number of participants with adverse events (AEs) reported during the post-treatment observation period. AEs included clinically-significant changes in vital signs, ECG, clinical laboratory assessments, physical and neurological examinations. Sickle cell-specific symptoms included the development of new skin ulcers, hospitalization or ambulatory acute care, intravenous analgesics visit for pain episodes (i.e., sickle-cell disease related pain), acute chest syndrome, priapism, and stroke.	Post-treatment observation period of 21 days (Day 29 to Day 49)
Primary	Number of Participants With Sickle-Cell Disease-related Symptoms		Placebo lead-in period of 14 days (Day -14 to Day -1), double-blind treatment period of 28 days (Day 1 to Day 28) and post-treatment observation period of 21 days (Day 29 to Day 49)
Primary	Number of Clinically Significant Observations of Vital Signs, 12-lead ECGs, Clinical Laboratory Assessments, and Physical and Neurological Examinations	Vital signs, 12-lead ECGs, clinical laboratory assessments, and physical and neurological examinations that were deemed clinically significant by the investigator in agreement with the sponsor study director.	Throughout the study period (approximately 9 weeks)
Primary	PK: - Plasma AUC, Cmax, Tmax, and T1/2 of Aes-103 and Its Metabolite, HMFA - RBC Hemolysate AUC (0-8h), Cmax, Tmax, and T1/2 of Aes-103 - Percentage of Hemoglobin Bound to Aes-103	Pharmacokinetic endpoints in the study protocol were as follows:- - Plasma Area under curve (AUC), Maximum plasma concentration (Cmax), time at which Cmax observed (Tmax), and terminal half-life (T1/2) of Aes-103 and its metabolite, 5-hydroxymethyl-2-furoic acid (HMFA) - red blood cell (RBC) hemolysate Area under curve between 0 and 8 hours (AUC [0-8h]), Cmax, Tmax, and T1/2 of Aes-103 - Percentage of hemoglobin bound to Aes-103	PK blood samples were to be taken within 10 minutes before dosing and 0.5, 1, 2, 4, and 6 hours after the first dose of study product on Days 1 and 7 and at the same time points on Day 28 (or early termination)
Secondary	Resting Oxygen Saturation as Measured by Oximetry (SpO2) - Change From Baseline	A measure of the amount of oxygen in the blood. Oxygen saturation was determined by pulse oximetry. A pulse oximeter was placed over a nail polish-free finger nail to determine peripheral oxygen saturation (SpO2). Baseline was defined as the most recent value obtained prior to the start of dosing on Day 1 of the double-blind treatment period. A mean change from baseline >0 indicates an increase in oxygen saturation, a mean change <0 indicates a decrease in oxygen saturation. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	Prior to, during and after the end of dosing in the double-blind treatment period, i.e., at baseline, Day 4, Day 7, Day 14 and Day 28
Secondary	Oxygen Binding p50/p20 Value - Change From Baseline	A measure of the ability of hemoglobin to bind oxygen. The p50 is the oxygen level at which 50% of the hemoglobin contains oxygen. The p20 is the oxygen level at which 20% of the hemoglobin contains oxygen. Baseline is defined as the most recent value obtained prior to start of dosing on Day 1 of the double-blind treatment period. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	During the double-blind treatment period at baseline, Day 1, Day 4 and Day 7
Secondary	Plasma Erythropoietin (EPO) Levels - Change From Baseline	Erythropoietin (EPO) is a hormone produced by the kidney that promotes the formation of red blood cells by the bone marrow. EPO can be detected and measured in the blood. Baseline defined as the most recent value obtained prior to the start of dosing on Day 1 of the double-blind treatment period. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	At baseline and Day 28 during the double-blind treatment period
Secondary	Hematocrit Levels - Change From Baseline	Baseline defined as the most recent value obtained prior to the start of dosing on Day 1 of the double-blind treatment period. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	Prior to, during and after the end of dosing in the double-blind treatment period, i.e., at baseline, Day 1, Day 7, Day 14 and Day 28
Secondary	Lactate Dehydrogenase (LDH) Levels - Change From Baseline	LDH levels were measured as a biomarker for intravascular hemolysis. The results are based on the LDH Total measurement. Baseline defined as the most recent value obtained prior to the start of dosing on Day 1 of the double-blind treatment period. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	Prior to, during and after the end of dosing in the double-blind treatment period, i.e., at baseline, Day 1, Day 7, Day 14 and Day 28
Secondary	Hemoglobin Levels - Change From Baseline	A clinical laboratory endpoint that reflects the amount of red blood cells present in the blood. Baseline defined as the most recent value obtained prior to the start of dosing on Day 1 of the double-blind treatment period. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	Prior to, during and after the end of dosing in the double-blind treatment period, i.e., at baseline, Day 1, Day 4, Day 7, Day 14, Day 21 and Day 28
Secondary	Reticulocyte Percent- Change From Baseline	Category title includes number of participants with available data (n) for participants treated with study product.	At baseline, Day 1 and Day 7 during the double-blind treatment period
Secondary	Direct Bilirubin - Change From Baseline	Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	Prior to, during and after the end of dosing in the double-blind treatment period, i.e., at baseline, Day 1, Day 7, Day 14, Day 21 and Day 28
Secondary	LDH Isoform - Change From Baseline		Prior to, during and after the end of dosing in the double-blind treatment period, i.e., at baseline, Day 1, Day 7, Day 14 and Day 28
Secondary	C Reactive Protein Levels - Change From Baseline	Category title includes number of participants with available data (n) for participants treated with study product.	At baseline, Day 1 and Day 7 during the double-blind treatment period
Secondary	Serum Ferritin Levels - Change From Baseline		At baseline, Day 1 and Day 7 during the double-blind treatment period
Secondary	N-terminal Pro B-type Natriuretic Peptide (NT-proBNP) Levels- Change From Baseline	Category title includes number of participants with available data (n) for participants treated with study product.	At baseline, Day 1, Day 7, Day 14 and Day 28 during the double-blind treatment period
Secondary	Body Weight - Change From Baseline	A negative change in body weight denotes a weight decrease, a positive change in body weight denotes a weight increase. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	Prior to, during and after the end of dosing in the double-blind treatment period, i.e., at baseline, Day 1, Day 4, Day 7, Day 14, Day 21 and Day 28
Secondary	Exercise Tolerance: 6-Minute Walk Distance During the Double-blind Treatment Period - Change From Baseline	Functional exercise capacity was evaluated by using the 6-minute walk test (6MWT) which measures the distance that a subject can quickly walk on a flat, hard surface in a period of 6 minutes. Guidelines developed by the American Thoracic Society were used for conducting the test and interpreting the results. Baseline defined as the most recent value obtained prior to the start of dosing on Day 1. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	Prior to, during and after the end of dosing in the double-blind treatment period, i.e., at baseline, Day 4, Day 7, Day 14 and Day 28
Secondary	Exercise Tolerance: 6-Minute Walk Distance on Day 49 of the Post-treatment Observation Period - Change From Baseline	Functional exercise capacity was evaluated by using the 6-minute walk test (6MWT) which measures the distance that a subject can quickly walk on a flat, hard surface in a period of 6 minutes. Guidelines developed by the American Thoracic Society were used for conducting the test and interpreting the results. Baseline defined as the most recent value obtained prior to the start of dosing on Day 1.	Prior to dosing at baseline and on Day 49 of the post-treatment observation period
Secondary	Exercise Tolerance: 6-Minute Walk Distance on Day 49 of the Post-treatment Observation Period - Change From Last Day of Double-blind Treatment Period (Day 28)	Functional exercise capacity was evaluated by using the 6-minute walk test (6MWT) which measures the distance that a subject can quickly walk on a flat, hard surface in a period of 6 minutes. Guidelines developed by the American Thoracic Society were used for conducting the test and interpreting the results.	On last day of double-blind treatment period (Day 28) and on Day 49 of the post-treatment observation period
Secondary	Exercise Tolerance: Cardiopulmonary Exercise Test [CPET]	CPET was optional, based on capacity of participant to complete the test.	On last day of double-blind treatment period (Day 28)
Secondary	Patients´ Global Impression of Change (PGIC) During the Double-blind Treatment Period - Change From Baseline	Participants assessed the change in activity limitations, symptoms, emotions, and overall quality of life by using the 1- to 7-point PGIC scale. The question and scale was as follows: Since beginning treatment at this clinic, how would you describe the change in your sickle cell condition? Please circle the number that matches your overall judgment. -3 - much worse -2 - moderately worse -1 - minimally worse 0 - no change +1 - minimally improved +2 - moderately improved +3 - much improved. Baseline defined as the most recent value obtained prior to the start of dosing on Day 1 of the double-blind treatment period. No values available for placebo group for Day 28. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	At baseline and once weekly on Days 7, 14, 21, and 28 during the double-blind treatment period
Secondary	Patients´ Global Impression of Change (PGIC) During the Post-treatment Observation Period - Change From Baseline	Participants assessed the change in activity limitations, symptoms, emotions, and overall quality of life by using the 1- to 7-point PGIC scale. The question and scale was as follows: Since beginning treatment at this clinic, how would you describe the change in your sickle cell condition? Please circle the number that matches your overall judgment. -3 - much worse -2 - moderately worse -1 - minimally worse 0 - no change +1 - minimally improved +2 - moderately improved +3 - much improved. Baseline defined as the most recent value obtained prior to the start of dosing on Day 1 of the double-blind treatment period. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	At baseline and once weekly on Days 35, 42, and 49 during the post-treatment observation period
Secondary	Patients´ Global Impression of Change (PGIC) During the Post-treatment Observation Period - Change From Last Day of Double-blind Treatment Period	Participants assessed the change in activity limitations, symptoms, emotions, and overall quality of life by using the 1- to 7-point PGIC scale. The question and scale was as follows: Since beginning treatment at this clinic, how would you describe the change in your sickle cell condition? Please circle the number that matches your overall judgment. -3 - much worse -2 - moderately worse -1 - minimally worse 0 - no change +1 - minimally improved +2 - moderately improved +3 - much improved. Baseline was defined as the most recent value obtained on the last day of the double-blind treatment period. Categories contain Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	At baseline and once weekly on Days 35, 42, and 49 during the post-treatment observation period
Secondary	Numerical Pain Rating Scale (NPRS): Worst Pain (Weekly Average) in the Double-blind Treatment Period - Change From Baseline	Participants assessed their pain levels by using the 0-10 Numeric Rating Scale: 0 = No pain 1-3 = Mild pain (nagging, annoying, interfering little with activities of daily living [ADLs]) 4-6 = Moderate pain (interferes significantly with ADLs) 7-10 = Severe pain (disabling; unable to perform ADLs A negative mean change denotes a pain decrease. A positive mean change denotes an increase in pain. Baseline was defined as the average of all measures taken from screening through the period prior to start of dosing on Day 1. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	Participants assessed and recorded their pain level daily. Weekly averages were calculated for the Day 7, Day 14, Day 21, and Day 28 assessments
Secondary	Numerical Pain Rating Scale (NPRS): Worst Pain (Weekly Average) in the Double-blind Treatment Period - AUC	Participants assessed their pain levels by using the 0-10 Numeric Rating Scale: 0 = No pain 1-3 = Mild pain (nagging, annoying, interfering little with activities of daily living [ADLs]) 4-6 = Moderate pain (interferes significantly with ADLs) 7-10 = Severe pain (disabling; unable to perform ADLs A negative mean change denotes a pain decrease. A positive mean change denotes an increase in pain. Baseline was defined as the average of all measures taken from screening through the period prior to start of dosing on Day 1. Area under the curve (AUC) was computed using change from baseline in weekly average values at Day 7, Day 14, Day 21. and Day 28.	Participants assessed and recorded their pain level daily. Weekly averages were calculated for the Day 7, Day 14, Day 21, and Day 28 assessments
Secondary	Numerical Pain Rating Scale (NPRS): Worst Pain (Weekly Average) in the Post-treatment Observation Period - Change From Baseline	Participants assessed their pain levels by using the 0-10 Numeric Rating Scale: 0 = No pain 1-3 = Mild pain (nagging, annoying, interfering little with activities of daily living [ADLs]) 4-6 = Moderate pain (interferes significantly with ADLs) 7-10 = Severe pain (disabling; unable to perform ADLs A negative mean change denotes a pain decrease. A positive mean change denotes an increase in pain. Baseline was defined as the average of all measures taken from screening through the period prior to start of dosing on Day 1. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	Participants assessed and recorded their pain level daily. Weekly averages were calculated for the Day 35, Day 42 and Day 49 assessments
Secondary	Numerical Pain Rating Scale (NPRS): Worst Pain (Weekly Average) in the Post-treatment Observation Period - AUC	Participants assessed their pain levels by using the 0-10 Numeric Rating Scale: 0 = No pain 1-3 = Mild pain (nagging, annoying, interfering little with activities of daily living [ADLs]) 4-6 = Moderate pain (interferes significantly with ADLs) 7-10 = Severe pain (disabling; unable to perform ADLs A negative mean change denotes a pain decrease. A positive mean change denotes an increase in pain. Baseline was defined as the average of all measures taken from screening through the period prior to start of dosing on Day 1. Area under the curve (AUC) was computed using change from baseline in weekly average values at Day 7, Day 14, Day 21, Day 28, Day 35, Day 42 and Day 49.	Participants assessed and recorded their pain level daily. Weekly averages were calculated for the Day 35, Day 42 and Day 49 assessments
Secondary	Numerical Pain Rating Scale (NPRS): Worst Pain (Weekly Average) in the Post-treatment Observation Period - Change From Last Day of Double-blind Treatment Period (Day 28)	Participants assessed their pain levels by using the 0-10 Numeric Rating Scale: 0 = No pain 1-3 = Mild pain (nagging, annoying, interfering little with activities of daily living [ADLs]) 4-6 = Moderate pain (interferes significantly with ADLs) 7-10 = Severe pain (disabling; unable to perform ADLs A negative mean change denotes a pain decrease. A positive mean change denotes an increase in pain. Baseline was defined as the most recent value obtained on the last day of the double-blind dosing period (Day 28). Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	Participants assessed and recorded their pain level daily. Weekly averages were calculated for the Day 35, Day 42 and Day 49 assessments
Secondary	Numerical Pain Rating Scale (NPRS): Worst Pain (Weekly Average) in the Post-treatment Observation Period - Change From Last Day of Double-blind Treatment Period (Day 28) - AUC	Participants assessed their pain levels by using the 0-10 Numeric Rating Scale: 0 = No pain 1-3 = Mild pain (nagging, annoying, interfering little with activities of daily living [ADLs]) 4-6 = Moderate pain (interferes significantly with ADLs) 7-10 = Severe pain (disabling; unable to perform ADLs A negative mean change denotes a pain decrease. A positive mean change denotes an increase in pain. Baseline was defined as the most recent value obtained on the last day of the double-blind dosing period (Day 28). Area under the curve (AUC) was computed using change from baseline (Day 28) in weekly average values at Day 35, Day 42 and Day 49.	Participants assessed and recorded their pain level daily. Weekly averages were calculated for the Day 35, Day 42 and Day 49 assessments
Secondary	Brief Pain Inventory (BPI): Average Pain Level in Last 24 Hours (Double-blind Treatment Period) - Change From Baseline	Participants rated the severity of their pain by using the BPI short form. Pain was rated on a scale from 0 (no pain) to 10 (pain as bad as you can imagine). A negative mean change denotes a pain decrease. A positive mean change denotes an increase in pain. Baseline was defined as the most recent value obtained prior to the start of the dosing on Day 1 of the double-blind dosing period. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	At baseline, Day 7 and Day 28 during the double-blind treatment period
Secondary	Brief Pain Inventory (BPI): Worst Pain Level in Last 24 Hours (Double-blind Treatment Period) - Change From Baseline	Participants rated the severity of their pain by using the BPI short form. Pain was rated on a scale from 0 (no pain) to 10 (pain as bad as you can imagine). A negative mean change denotes a pain decrease. A positive mean change denotes an increase in pain. Baseline was defined as the most recent value obtained prior to the start of the dosing on Day 1 of the double-blind dosing period. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	At baseline, Day 7 and Day 28 during the double-blind treatment period
Secondary	Brief Pain Inventory (BPI): Worst Pain Level in Last 24 Hours (Post-treatment Observation Period) - Change From Baseline	Participants rated the severity of their pain by using the BPI short form. Pain was rated on a scale from 0 (no pain) to 10 (pain as bad as you can imagine). A negative mean change denotes a pain decrease. A positive mean change denotes an increase in pain. Baseline was defined as the most recent value obtained prior to the start of the dosing on Day 1 of the double-blind dosing period.	At baseline and Day 49 during the post-treatment observation period
Secondary	Brief Pain Inventory (BPI): Interference of Pain With Aspects of Life (General Activity) During Double-blind Treatment Period - Change From Baseline	Participants rated the degree to which their pain interfered with various daily functions by using the BPI short form. Interference with general activity was rated on a scale from 0 (does not interfere) to 10 (completely interferes). Baseline was defined as the most recent value obtained prior to the start of the dosing on Day 1 of the double-blind dosing period. Category title includes number of participants with available data (n) for participants treated with study product, followed by participants treated with placebo.	At baseline, Day 7 and Day 28 during the double-blind treatment period
Secondary	Brief Pain Inventory (BPI): Interference of Pain With Aspects of Life (General Activity) During Post-treatment Observation Period - Change From Baseline	Participants rated the degree to which their pain interfered with various daily functions by using the BPI short form. Interference with general activity was rated on a scale from 0 (does not interfere) to 10 (completely interferes). Baseline was defined as the most recent value obtained prior to the start of the dosing on Day 1 of the double-blind dosing period.	At baseline and Day 49 during the post-treatment observation period
Secondary	Analgesic Use	Analgesic use assessed with pain levels by numerical pain rating scale (NPRS) and brief pain inventory (BPI).	Throughout the study period (approximately 9 weeks)
Secondary	Reduction in Sickle Cell-specific Complications		Throughout the study period (approximately 9 weeks)