CR845-CLIN3103: A Global Study to Evaluate the Safety and Efficacy of CR845 in Hemodialysis Patients With Moderate-to-Severe Pruritus

Study Overview
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Brief Summary
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This is a multicenter, international study to evaluate the safety and efficacy of intravenous (IV) CR845 at a dose of 0.5 mcg/kg administered after each dialysis session. The study includes a 12-week randomized, double-blind, placebo-controlled Phase and a 52-week Open-label Extension Phase.

Detailed Description
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Double-blind Phase: The Double-blind Phase of the study will consist of a Screening Visit, a 7-day Run-in Period, and a 12-week Double-blind Treatment Period. Informed consent will be obtained prior to performing any study-specific procedures. The Screening Visit will occur within 7 to 28 days prior to randomization to assess eligibility. Open-label Extension Phase: Patients who received at least 30 doses of study drug (either active or placebo) during the 12-week Double-blind Treatment Period and continue to meet other eligibility criteria will have the option to receive open label CR845 for an additional 52 weeks. The last dose of open-label study drug will be administered at the last dialysis visit on Week 52, or Early Termination. Follow-up Period: A final safety Follow up Visit will be conducted 7-10 days after the End of Treatment/Early Termination Visit.

Official Title
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A Multicenter, Double-blind, Randomized, Placebo-controlled Study to Evaluate the Safety and Efficacy of Intravenous CR845 in Hemodialysis Patients With Moderate-to-Severe Pruritus, With a 52-Week Open Label Extension

Conditions
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Uremic Pruritus

Intervention / Treatment
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* Drug: CR845 0.5 mcg/kg
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Key Inclusion Criteria: To be eligible for inclusion into the Double-blind Phase of the study, a patient must meet the following criteria: Has end-stage renal disease (ESRD) and has been on hemodialysis 3 times per week for at least 3 months prior to the start of screening; Has at least 2 single-pool Kt/V measurements ≥1.2, or at least 2 urea reduction ratio measurements ≥65%, or 1 single pool Kt/V measurement ≥1.2 and 1 urea reduction ratio measurement ≥65% on different dialysis days during the 3 months period prior to screening; Prior to randomization: Has completed Worst Itching Intensity NRS worksheets up to 8 days prior to 1st dose; Has a mean baseline Worst Itching Intensity NRS indicative of moderate to severe uremic pruritus. To be eligible for inclusion into the Open-label Extension Phase of the study, each patient will have to fulfill the additional key following criteria at the time of entry into the Open-label Extension Phase: Has received at least 30 doses of the planned 36 doses of study drug during the Double-blind Phase of this study; Continues to meet inclusion criteria. Key Exclusion Criteria: A patient will be excluded from the Double-blind Phase of the study if any of the following criteria are met: Known noncompliance with dialysis treatment that in the opinion of the investigator would impede completion or validity of the study; Scheduled to receive a kidney transplant during the study; New or change of treatment received for itch including antihistamines and corticosteroids (oral, IV, or topical) within 14 days prior to screening; Received another investigational drug within 30 days prior to the start of screening or is planning to participate in another clinical study while enrolled in this study; Has pruritus only during the dialysis session (by patient report); Is receiving ongoing ultraviolet B and anticipates receiving such treatment during the study; Participated in a previous clinical study with CR845. A patient will be excluded from the Open-label Extension Phase of the study if any of the additional key following criteria are met at the time of entry into the Open-label Extension Phase: Completed the Double-blind Phase of this study but exhibited adverse events during the course of the Treatment Period that may preclude continued exposure to the study drug; Was noncompliant with protocol procedures during the Double-blind Phase of this study which is indicative of an inability to follow protocol procedures.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: CR845 0.5mcg/kg<br>IV CR845 0.5 mcg/kg administered after each dialysis session (3 times/week) | Drug: CR845 0.5 mcg/kg<br>* IV CR845 0.5 mcg/kg administered three times/week<br>* Other names: Difelikefalin;|
| Placebo Comparator: Placebo<br>IV Placebo administered after each dialysis session (3 times/week) | Drug: Placebo<br>* IV placebo administered three times/week<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Reduction of Itch Intensity as Assessed by the Percentage of Patients Achieving an Improvement From Baseline ≥3 Points With Respect to the Weekly Mean of the Daily 24-hour Worst Itching Intensity Numerical Rating Scale (NRS) Score at Week 12 | 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. LS means estimated percent, odds ratio and P value used a logistic regression model. | Week 12 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Reduction of Itch Intensity as Assessed by the Percentage of Patients Achieving an Improvement From Baseline ≥4 Points With Respect to the Weekly Mean of the Daily 24-hour Worst Itching Intensity NRS Score at Week 12 | 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. LS means estimated percent, odds ratio and P value used a logistic regression model. | Week 12 | 
| Improvement in Itch-related Quality of Life as Assessed by the Change From Baseline in Total Skindex-10 Scale Score at the End of Week 12 | The Skindex-10 Scale is a multidimensional questionnaire which assesses itch-related quality of life over the past week. The questions cover 3 domains: disease, mood/emotional distress, and social functioning domain. The Skindex-10 has 10 questions; the total Skindex-10 score ranges from 0 to 60. A lower total score represents better quality of life. | Baseline, Week 12 | 
| Improvement in Itch-related Quality of Life as Assessed by the Change From Baseline in 5-D Itch Scale Score at the End of Week 12 | The 5-D Itch Scale is a multidimensional questionnaire which assesses itch-related quality of life over the past 2 weeks. The questions cover five dimensions of itch including the degree, duration of itch/day, direction (improvement/worsening), disability (impact on activities such as work), and body distribution of itch. The 5-D Itch Scale has 5 questions; the total 5-D Itch Scale score ranges from 5 to 25, with higher scores indicating worse responses. | Baseline, Week 12 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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CKD, Hemodialysis, difelikefalin, CR845, Pruritus, Chronic Itch, Itch, Itching, Uremic Pruritus, Dialysis, CKD-associated pruritus, CKD-aP, ESRD (end stage renal disease), KALM, Chronic Kidney Disease, Kidney failure, chronic, Kidney dysfunction, Generalized pruritus