A Multicenter, Randomized, Double-blind, Placebo-controlled 12-Week Study to Evaluate the Safety and Efficacy of Oral Difelikefalin in Advanced Chronic Kidney Disease Subjects With Moderate-to-Severe Pruritus With an up to 52-Week Long-term Extension
Overview
- Phase
- Phase 3
- Intervention
- Difelikefalin 1 mg Oral Tablet
- Conditions
- Chronic Kidney Diseases
- Sponsor
- Cara Therapeutics, Inc.
- Enrollment
- 286
- Locations
- 3
- Primary Endpoint
- Efficacy Assessment Phase (Treatment Period 1): Proportion of subjects achieving at least a 4-point improvement from baseline with respect to the weekly mean of the daily 24-hour WI-NRS score at Week 12 of Treatment Period 1
- Status
- Terminated
- Last Updated
- last year
Overview
Brief Summary
This is a multicenter, double-blind, randomized, placebo-controlled study to evaluate the safety and efficacy of oral difelikefalin administered as a 1 mg tablet once daily compared to placebo in reducing the intensity of itch in advanced chronic kidney disease (CKD) patients with moderate-to-severe pruritus. This study is comprised of an Efficacy Assessment Phase and a Long-term Extension Phase. The Efficacy Assessment Phase includes a double-blind 12-week Treatment Period (Treatment Period 1), and the Long-term Extension Phase includes a double-blind Treatment Period (Treatment Period 2) of up to 52 weeks.
Detailed Description
This study will consist of a Screening Period, a 7-day Run-in Period, a 12 week double-blind Efficacy Assessment Phase (Treatment Period 1), a double-blind Long-term Extension Phase (Treatment Period 2) of up to 52 weeks, and a Follow-up Visit (7 to 10 days after the End of Treatment (EOT)/Early Termination (ET) Visit). If patients continue to meet all inclusion and no exclusion criteria at the end of the 7-day Run-in Period, they will be randomized in a 1:1 ratio to receive once daily oral difelikefalin tablets at a dose of 1 mg or placebo for 12 weeks. Subjects will be stratified according to their use or nonuse of medications to treat pruritus prior to randomization as well as the presence or absence of specific medical conditions. During the Long-term Extension Phase, patients will be re-randomized on Day 1 of Treatment Period 2 to receive either oral difelikefalin 1 mg or placebo, once daily for up to an additional 52 weeks. A final safety Follow-up Visit will be conducted 7 to 10 days after the EOT/ET. Informed consent will be obtained prior to performing any study-specific procedures. Screening will occur within 7 to 28 days prior to randomization to assess eligibility.
Investigators
Eligibility Criteria
Inclusion Criteria
- •To be eligible for inclusion into the study, a patient must meet the following criteria:
- •Advanced stage 4 and 5 CKD and end stage renal disease on hemodialysis
- •Subject self-reports experiencing at least near-daily (eg, most days of a week) pruritus for at least 6 months prior to screening.
- •Inadequate response to current or prior treatments (including emollients/moisturizers, topical medications, or systemic treatments) for pruritus prior to screening.
- •Prior to randomization on Day 1 of Treatment Period 1:
- •Has recorded at least 4 WI-NRS scores during the 7-day Run-in Period; and
- •Has a mean baseline WI-NRS score ≥ 5, defined as the average of all non-missing scores reported during the 7-day Run-in Period.
Exclusion Criteria
- •A patient will be excluded from the study if any of the following criteria are met:
- •Scheduled to receive a renal replacement therapy (dialysis or kidney transplant) during the study.
- •Has a concomitant disease, significant medical condition or physical/laboratory/ECG/vital signs abnormality that, in the opinion of the investigator, puts the subject at undue risk or interferes with interpretation of study results, impedes completion of the study procedures, or compromises the validity of the study measurements.
- •New or change of treatment received for itch, including antihistamines and corticosteroids (oral, intravenous, or topical), within 14 days prior to the start of run-in.
Arms & Interventions
Difelikefalin 1 mg Oral Tablet
Patients receive oral difelikefalin 1 mg once daily
Intervention: Difelikefalin 1 mg Oral Tablet
Placebo Oral Tablet
Patients receive oral placebo once daily
Intervention: Placebo Oral Tablet
Outcomes
Primary Outcomes
Efficacy Assessment Phase (Treatment Period 1): Proportion of subjects achieving at least a 4-point improvement from baseline with respect to the weekly mean of the daily 24-hour WI-NRS score at Week 12 of Treatment Period 1
Time Frame: Week 12 of Treatment Period 1
Intensity of itch will be measured using an NRS used to indicate the intensity of the worst itching over the past 24 hours using a 0 to 10 numeric rating scale, where "0" represents "no itching" and "10" represents "worst itching imaginable".
Secondary Outcomes
- Efficacy Assessment Phase (Treatment Period 1): Proportion of subjects achieving at least a 4-point improvement from baseline with respect to the weekly mean of the WI-NRS at Week 8 of Treatment Period 1.(Week 8 of Treatment Period 1)
- Efficacy Assessment Phase (Treatment Period 1): Proportion of subjects achieving at least a 4-point improvement from baseline with respect to the weekly mean of the WI-NRS at Week 4 of Treatment Period 1.(Week 4 of Treatment Period 1)
- Efficacy Assessment Phase (Treatment Period 1): Proportion of subjects who are "complete itch responders" defined as subjects with ≥ 70% of the non-missing 24-hour WI-NRS scores equal to 0 or 1 at Week 12 of Treatment Period 1.(Week 12 of Treatment Period 1)
- Efficacy Assessment Phase (Treatment Period 1): Change from baseline in Sleep Quality Questionnaire score at the end of Week 12 of Treatment Period 1.(Week 12 of Treatment Period 1)