This Study Will Investigate the Efficacy and Safety of A4250 in Children With PFIC Types 1 or 2

Albireo62 enrolled

Overview

Double blind, randomized, placebo controlled, Phase 3 study to investigate the efficacy and safety of low doses and high doses of A4250 compared to placebo in children with progressive familial intrahepatic cholestasis (PFIC) types 1 and 2.

Up to 50 sites in the following countries will take part in this study: Australia, Belgium, Canada, France, Germany, Israel, Italy, Netherlands, Poland, Spain, Sweden, Turkey, United Kingdom, United States, and Saudi Arabia

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

QUADRUPLE

Enrollment

Conditions

PFIC1 PFIC2

Interventions

A4250 (odevixibat)DRUG

A4250 is a small molecule and selective inhibitor of ileal bile acid transporter (IBAT).

PlaceboDRUG

Placebo identical in appearance to active drug (A4250).

Eligibility

Sex: ALLMin age: 6 MonthsMax age: 18 Years

Medical Language ↔ Plain English

Key Inclusion Criteria: * A male or female participant with a clinical diagnosis of PFIC Type 1 or 2 and with a body weight above 5 kg * Participant must have clinical genetic confirmation of PFIC-1 or PFIC-2 * Participant must have elevated serum bile acid (s-BA) concentration * Participant must have history of significant pruritus and a caregiver reported observed scratching in the eDiary * Participant and/or legal guardian must sign informed consent (and assent) as appropriate. * Participants will be expected to have a consistent caregiver(s) for the duration of the study * Caregivers and age-appropriate participants (≥8 years of age) must be willing and able to use an eDiary device as required by the study Key Exclusion Criteria: * Participant with pathologic variations of the ABCB11 gene that predict complete absence of the bile salt export pump (BSEP) protein * Participant with past medical history or ongoing presence of other types of liver disease including, but not limited to, the following: 1. Biliary atresia of any kind 2. Benign recurrent intrahepatic cholestasis, indicated by any history of normal s BAs 3. Suspected or proven liver cancer or metastasis to the liver on imaging studies 4. Histopathology on liver biopsy that is suggestive of alternate non-PFIC related etiology of cholestasis * Participant with past medical history or ongoing chronic diarrhea * Any participant with suspected or confirmed cancers except for basal cell carcinoma * Participant with a past medical history of chronic kidney disease with an impaired renal function and a glomerular filtration rate \<70 mL/min/1.73 m\^2 * Participant with surgical history of disruption of the enterohepatic circulation (biliary diversion surgery) within 6 months prior to start of Screening Period * Participant has had a liver transplant or a liver transplant is planned within 6 months of randomization * Decompensated liver disease * Participant suffers from uncontrolled, recalcitrant pruritic condition other than PFIC * Participant who has been previously treated with an IBAT inhibitor whose pruritus has not responded to treatment

Locations (45)

Outcomes

Primary Outcomes

Percentage of Participants With at Least a 70% Reduction in Fasting Serum Bile Acid (s-BA) Concentration From Baseline to the End of Treatment or Reaching a Level <=70 Micromoles Per Liter (Mcmol/L) After 24 Weeks of Treatment

Fasting s-BA baseline was calculated as the average of the last 2 values prior to the first dose. The end value was the average of the values at Weeks 22 and 24 after the start of double-blind treatment. Participants who had at least 70% reduction in fasting s-BA from baseline to the end of treatment or reached \<=70 mcmol/L after 24 weeks of treatment were considered as responder. Participants with missing average at the end of treatment were classified as non-responder. Percentages are rounded to hundredth decimal.

Time frame: From Baseline (Day 1) up to Week 24

Percentage of Positive Pruritus Assessments at the Participant Level Based on the Albireo Observer-Reported Outcome (ObsRO) Instrument Over the 24-Week Treatment Period

A positive pruritus assessment was defined as a scratching score of \<=1 or at least 1 point drop from baseline. The percentage of positive pruritus assessment was calculated as the number of positive pruritus assessments divided by the total number of reported assessments only when more than 50% of planned assessment recorded by each participant multiplied by 100.

Time frame: From Baseline (Day 1) up to Week 24

Secondary Outcomes

Change From Baseline in Fasting Serum Bile Acid at Weeks 12 and 24

Blood samples for analysis of s-BA were drawn at all visits. Participants were to fast (water intake only was permissible) for at least 4 hours prior to the collection of samples. Exceptions could be made for infants \<12 months of age if they were unable to fast for the full 4 hours. Baseline was the average of the last 2 non-missing values of fasting s-BA concentration prior to the first dose of study treatment.

Time frame: Baseline (Day 1) and Weeks 12 and 24

Change From Baseline in Serum Alanine Aminotransferase (ALT) Concentration at Weeks 12 and 24

Data from ClinicalTrials.gov

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Children's Hospital Los Angeles

Los Angeles, California, United States

University of California, San Francisco

San Francisco, California, United States

Children's Hospital Colorado

Denver, Colorado, United States

Emory University School of Medicine

Atlanta, Georgia, United States

Johns Hopkins School of Medicine

Baltimore, Maryland, United States

Washington University School of Medicine

St Louis, Missouri, United States

Icahn School of Medicine at Mount Sinai

New York, New York, United States

Columbia University Medical Center - Presbyterian Hospital Building

New York, New York, United States

Cleveland Clinic

Cleveland, Ohio, United States

Children's Hospital of Philadelphia

Philadelphia, Pennsylvania, United States

...and 35 more locations

Blood samples were collected to determine the ALT concentration. Baseline was the last available assessment before the first dose of study treatment.

Time frame: Baseline (Day 1) and Weeks 12 and 24

Change From Baseline in Growth Parameters at Weeks 12 and 24

The change in the growth parameters was assessed using linear growth deficit \[height (centimeter), weight (kilogram) and body mass index (BMI) (kg/meter square)\] compared to standard growth curve (Z-score) calculated by using the software or methods from the centers for disease control (CDC) website for participants with age \>=2 years old and from the world health organization website for participants with age \<2 years old. Participants whose accurate age was not available, Z-score was not calculated. A Z-score indicated how many standard deviation's (SD) a participant's measurement (like height, weight and BMI), was from the average for their age and sex. A Z-score of 0 represents the median or 50th percentile, while positive or negative values show how far above or below average a measurement was. Baseline was the last available assessment before the first dose of study treatment.

Time frame: Baseline (Day 1) and Weeks 12 and 24

Percentage of Responders for Pruritus Assessments Based on Bi-Weekly and Monthly Scores Using the Albireo Observer-Reported Outcome Instrument at Weeks 12 and 24

The responder for pruritus scores was defined as a participant who achieved at least a 1-point reduction in the ObsRO pruritus score. Percentages are rounded to hundredth decimal.

Time frame: Weeks 12 and 24

Change From Baseline in Sleep Parameters Based on the Albireo Observer-reported Outcome Instrument Over the 24-Week Treatment Period

The sleep disturbance were recorded twice daily via the electronic diary (eDiary). Participants and/or caregivers completed the eDiary every day in the morning and in the evening. The morning diary was completed shortly after the participant woke up and was used to record nighttime itching and scratching severity, aspects of sleep disturbance, and tiredness upon waking (AM scores). The evening/bedtime diary was completed just before the participant went to bed and recorded participant's itching and scratching severity, and tiredness during the day (PM scores). Both morning and bedtime diaries included Albireo ObsRO and PRO items. Baseline was the average of 14-day scores before the first dose of study treatment.

Time frame: Baseline (Day 1) and Weeks 1 to 4, Weeks 5 to 8, Weeks 9 to 12, Weeks 13 to 16, Weeks 17 to 20, and Weeks 21 to 24

Change From Baseline in Sleep Parameters Based on the Albireo Patient-Reported Outcome (PRO) Instrument Over the 24-Week Treatment Period

The ObsRO and electronic diary (eDiary) PRO scale called PRUCISION was used to assess pruritus and sleep outcomes. Participants and/or caregivers completed the eDiary every day in the morning (AM scores) and in the evening (PM scores). Specifically, for difficulty falling or staying asleep, the following 2 respective questions were asked in the Morning Daily eDiary: 1) How hard was it to fall asleep last night because of your itching. and 2) How hard was it to stay asleep last night because of your itching. The PRO was a 5-point scale, and scores ranged from 0 (no itching) to 28 (the worst itching), where higher scores indicated a greater amount of itching, sleep disturbance, and tiredness. No subscales were used. Change in sleep parameters measured with the Albireo PRO and ObsRO instruments by each 4-week interval over the 24-week treatment period was assessed. Baseline was the average of 14-day scores before the first dose of study treatment.

Time frame: Baseline (Day 1) and Weeks 1 to 4, Weeks 5 to 8, Weeks 9 to 12, Weeks 13 to 16, Weeks 17 to 20, and Weeks 21 to 24

Percentage of Individual Assessments Meeting the Definition of a Positive Pruritus Assessment at the Participant Level Using the Albireo ObsRO Instrument Over the 24-Week Treatment Period

A positive pruritus assessment was defined as a scratching score of \<=1 or at least 1 point drop from baseline based on the Albireo ObsRO instrument. The percentage of positive pruritus assessment was calculated as the number of positive pruritus assessments divided by the total number of reported assessments only when more than 50% of planned assessment recorded by each participant multiplied by 100. At each assessment, the AM or PM score was compared to the baseline AM or PM average, respectively.

Time frame: From Baseline (Day 1) up to Week 24

Percentage of Individual Assessments Meeting the Definition of a Positive Pruritus Assessment at the Participant Level Using the Albireo PRO Instrument Over the 24-Week Treatment Period

A positive pruritus assessment was defined as a scratching score of \<=1 or at least 1 point drop from baseline based on the Albireo PRO instrument, only participants \>=8 years of age completed the Albireo PRO instrument. The percentage of positive pruritus assessment was calculated as the number of positive pruritus assessments divided by the total number of reported assessments only when more than 50% of planned assessment recorded by each participant multiplied by 100. At each assessment, the AM or PM score was compared to the baseline AM or PM average, respectively.

Time frame: From Baseline (Day 1) up to Week 24

Percentage of Individual Assessments Meeting the Definition of a Positive Pruritus Assessment at the Participant Level Using the Albireo ObsRO Instrument Over the 24-Week Treatment Period

Time frame: Baseline (Day 1) and Weeks 1 to 4, Weeks 5 to 8, Weeks 9 to 12, Weeks 13 to 16, Weeks 17 to 20, and Weeks 21 to 24

Number of Participants Underwent Biliary Diversion Surgery and Liver Transplantation

The number of participants underwent biliary diversion surgery and liver transplantation was determined.

Time frame: From Baseline (Day 1) up to Week 24

Number of Participants Achieved Positive Pruritus Assessment for >50% of the Time Based on the Albireo ObsRO and PRO Instruments Over the 24-Week Treatment Period

A positive pruritus assessment was defined as a scratching score of \<=1 or at least 1 point drop from baseline based on the Albireo ObsRO and PRO instruments. The percentage of positive pruritus assessment was calculated as the number of positive pruritus assessments divided by the total number of reported assessments only when more than 50% of planned assessment recorded by each participant multiplied by 100.

Time frame: From Baseline (Day 1) up to Week 24