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CompletedNCT03998163Updated Oct 15, 2021Results posted

CR845-CLIN3105: A Study to Evaluate the Safety and Effectiveness of CR845 in Hemodialysis Patients With Moderate-to-Severe Pruritus

A Phase 3 interventional study of CR845 0.5 mcg/kg in Uremic Pruritus, sponsored by Cara Therapeutics, Inc.. Completed at 47 sites in 4 countries. Open to participants aged 18 Years to 85 Years. Per ClinicalTrials.gov, last updated 2021-10-15.

Sponsored by Cara Therapeutics, Inc. · Phase 3, Interventional, and Treatment

Phase
Phase 3
Study type
Interventional
Enrollment
222
Allocation
Not applicable
Ages
18 Years to 85 Years
Sex
All
01

Study summary

This is a multicenter, open-label study to evaluate the safety and effectiveness of intravenous (IV) CR845 at a dose of 0.5 mcg/kg administered after each dialysis session. The study includes an up to 12-week Treatment Period.

Read the detailed description

Screening Period: The Screening Period includes a Screening Visit and a Run-In Period. Informed consent will be obtained prior to performing any study-specific procedures. The Screening Visit will occur within 21 days prior to the start of the Run-in Period. Patients will start the Run-in Period during the week prior to Treatment Period to complete eligibility verification.

Treatment Period: All scheduled study visits during the Treatment Period will be conducted on dialysis days. Patients will be administered CR845 as an IV bolus after the end of their dialysis during a Treatment Period of up to 12 weeks so that each patient will receive CR845 3 times weekly for a total of up to 36 doses. End of treatment (EOT) is defined as the first day of dialysis following the last dose of drug. The EOT procedures will be conducted on the dialysis visit following the last dose of study drug.

Follow-up Visit: A final safety Follow up Visit will be conducted 7-10 days after the EOT/Early Termination Visit.

02

Conditions studied

  • Uremic Pruritus

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Keywords

  • Hemodialysis
  • Pruritus
  • Uremic Pruritus
  • Dialysis
  • CR845
  • Chronic Itch
  • CKD
  • CKD-associated pruritus
  • CKD-aP
  • ESRD (end stage renal disease)
  • difelikefalin
  • Itch
  • Itching
  • KALM
  • Chronic Kidney Disease
  • Kidney failure, chronic
  • Kidney dysfunction
  • Generalized pruritus
03

In context

Pruritus

354 studies on the registry are indexed under Pruritus; 74 are open to participants now.

This study's enrollment of 222 is above the median of 60 across 294 interventional studies indexed under Pruritus.

Browse Pruritus studies →

Lead sponsor

Cara Therapeutics, Inc. is the lead sponsor of 24 studies on the registry; none are open to participants now.

Of its 15 completed or terminated interventional studies of FDA-regulated products, 5 (33%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 85 Years
Sexes eligible
All
Accepts healthy volunteers
No

Eligibility criteria

Key Inclusion Criteria:

To be eligible for inclusion into 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 Treatment:

    • Has completed at least 3 Worst Itching Intensity NRS questionnaires from the start of the Run-in Period up to and including the pre-dose assessment on Day 1;

Key Exclusion Criteria:

A patient will be excluded from 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;
  • New or change of prescription for opioids, gabapentin, or pregabalin within 14 days prior to screening;
  • Received another investigational drug within 30 days or five half-lives (whichever is longer) prior to the start of dosing or is planning to participate in another interventional clinical study while enrolled in this study;
  • Has pruritus only during the dialysis session (by patient report);
  • Is receiving ongoing ultraviolet B treatment and/or anticipates receiving such treatment during the study;
  • Participated in a previous clinical study with CR845.
05

Study design

Phase
Phase 3
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
222 participants (actual)

Study arms

  • Experimental
    CR845 0.5mcg/kg

    IV CR845 0.5 mcg/kg administered after each dialysis session (3 times/week)

    Drug: CR845 0.5 mcg/kg

Interventions

  • DrugCR845 0.5 mcg/kg

    IV CR845 0.5 mcg/kg administered three times/week

    Also known as: CR845, Difelikefalin

06

What researchers measure

Primary outcomes

  1. Number of Participants With AEs.

    Assessed by monitoring of adverse events.

    Time frame: Up to Follow-Up Visit (Week 13-14)

07

Results

Posted Oct 15, 2021

Participant flow

Participant flow — Overall Study
MilestoneCR845 0.5mcg/kg
Started222
Completed197
Not completed25

Outcome measures

PrimaryNumber of Participants With AEs.

Assessed by monitoring of adverse events.

Time frame:
Up to Follow-Up Visit (Week 13-14)
Reported as:
Count of participants · Participants
Number of Participants With AEs.
ParticipantsCR845 0.5mcg/kg
Number of Participants With AEs.143

Adverse events

Collected over Up to Follow-Up Visit (Week 13-14). Non-serious events are listed at a 5% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
CR845 0.5mcg/kg3/222 (1.4%)45/222 (20.3%)11/222 (5%)
Most frequent serious events
Showing 10 of 65
Most frequent serious events
EventCR845 0.5mcg/kg
HyperkalaemiaMetabolism and nutrition disorders5/222
Clostridium difficile colitisInfections and infestations3/222
SepsisInfections and infestations3/222
Arteriovenous fistula thrombosisInjury, poisoning and procedural complications3/222
SyncopeNervous system disorders3/222
AnaemiaBlood and lymphatic system disorders2/222
Cardio-respiratory arrestCardiac disorders2/222
Gastrointestinal haemorrhageGastrointestinal disorders2/222
InfluenzaInfections and infestations2/222
OsteomyelitisInfections and infestations2/222
Most frequent other events
Most frequent other events
EventCR845 0.5mcg/kg
DiarrhoeaGastrointestinal disorders11/222

Baseline characteristics

Age, Continuous
Age, Continuous(years)CR845 0.5mcg/kg
Mean58.1 ± 12.81
Sex: Female, Male
Sex: Female, Male(Participants)CR845 0.5mcg/kg
Female101
Male121
Race (NIH/OMB)
Race (NIH/OMB)(Participants)CR845 0.5mcg/kg
American Indian or Alaska Native2
Asian7
Native Hawaiian or Other Pacific Islander3
Black or African American110
White96
More than one race4
Unknown or Not Reported0
08

Study locations

47 sites
  • Cara Therapeutics Study Site
    Escondido, California 92025, United States
  • Cara Therapeutics Study Site
    Riverside, California 92505, United States
  • Cara Therapeutics Study Site
    San Diego, California 92111, United States
  • Cara Therapeutics Study Site
    Victorville, California 92395, United States
  • Cara Therapeutics Study Site
    Denver, Colorado 80230, United States
  • Cara Therapeutics Study Site
    Middlebury, Connecticut 06762, United States
  • Cara Therapeutics Study Site
    Norwich, Connecticut 06382, United States
  • Cara Therapeutics Study Site
    Coral Gables, Florida 33134, United States
  • Cara Therapeutics Study Site
    Fort Lauderdale, Florida 33308, United States
  • Cara Therapeutics Study Site
    Hollywood, Florida 33024, United States
  • Cara Therapeutics Study Site
    Miami, Florida 33169, United States
  • Cara Therapeutics Study Site 2
    Tampa, Florida 33614, United States
  • Cara Therapeutics Study Site
    Tampa, Florida 33614, United States
  • Cara Therapeutics Study Site
    Albany, Georgia 31701, United States
  • Cara Therapeutics Study Site
    Boston, Massachusetts 02111, United States
  • Cara Therapeutics Study Site
    Roseville, Michigan 48066, United States
  • Cara Therapeutics Study Site
    Minneapolis, Minnesota 55404, United States
  • Cara Therapeutics Study Site
    Kansas City, Missouri 64131, United States
  • Cara Therapeutics Study Site
    Las Vegas, Nevada 89106, United States
  • Cara Therapeutics Study Site 2
    Las Vegas, Nevada 89128, United States
  • Cara Therapeutics Study Site
    Great Neck, New York 11021, United States
  • Cara Therapeutics Study Site
    Philadelphia, Pennsylvania 19140, United States
  • Cara Therapeutics Study Site
    Spartanburg, South Carolina 29302, United States
  • Cara Therapeutics Study Site
    Knoxville, Tennessee 37920, United States
  • Cara Therapeutics Study Site
    Austin, Texas 78751, United States
  • Cara Therapeutics Study Site
    Duncanville, Texas 75137, United States
  • Cara Therapeutics Study Site
    Greenville, Texas 75402, United States
  • Cara Therapeutics Study Site
    Mansfield, Texas 76063, United States
  • Cara Therapeutics Study Site
    Mesquite, Texas 75080, United States
  • Cara Therapeutics Study Site 2
    San Antonio, Texas 78221, United States
  • Cara Therapeutics Study Site
    San Antonio, Texas 78251, United States
  • Cara Therapeutics Study Site 3
    San Antonio, Texas 78258, United States
  • Cara Therapeutics Study Site
    Temple, Texas 76502, United States
  • Cara Therapeutics Study Site
    Havlíčkův Brod, Czechia
  • Cara Therapeutics Study Site
    Nové Město Na Moravě, Czechia
  • Cara Therapeutics Study Site
    Praha, Czechia
  • Cara Therapeutics Study Site
    Sokolov, Czechia
  • Cara Therapeutics Study Site 2
    Budapest, Hungary
  • Cara Therapeutics Study Site
    Budapest, Hungary
  • Cara Therapeutics Study Site
    Dunaújváros, Hungary
  • Cara Therapeutics Study Site
    Kaposvár, Hungary
  • Cara Therapeutics Study Site
    Kistarcsa, Hungary
  • Cara Therapeutics Study Site
    Nyíregyháza, Hungary
  • Cara Therapeutics Study Site
    Szombathely, Hungary
  • Cara Therapeutics Study Site
    Ostrołęka, Poland
  • Cara Therapeutics Study Site
    Radom, Poland
  • Cara Therapeutics Study Site
    Sochaczew, Poland
09

References and documents

Publications

  • Weiner DE, Vervloet MG, Walpen S, Schaufler T, Munera C, Menzaghi F, Wen W, Bhaduri S, Germain MJ; trial investigators. Safety and Effectiveness of Difelikefalin in Patients With Moderate-to-Severe Pruritus Undergoing Hemodialysis: An Open-Label, Multicenter Study. Kidney Med. 2022 Aug 24;4(10):100542. doi: 10.1016/j.xkme.2022.100542. eCollection 2022 Oct. PubMed 36185706 ↗
  • Fishbane S, Wen W, Munera C, Lin R, Bagal S, McCafferty K, Menzaghi F, Goncalves J. Safety and Tolerability of Difelikefalin for the Treatment of Moderate to Severe Pruritus in Hemodialysis Patients: Pooled Analysis From the Phase 3 Clinical Trial Program. Kidney Med. 2022 Jun 28;4(8):100513. doi: 10.1016/j.xkme.2022.100513. eCollection 2022 Aug. PubMed 36039153 ↗

Study documents

  • Study protocol · Feb 12, 2019
  • Statistical analysis plan · Mar 9, 2020

Documents are hosted by the registry — open the source record to download them.

Individual participant data

Plan to share: No

10

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Oct 15, 2021, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT03998163
Lead sponsor
Cara Therapeutics, Inc.
Responsible party
Sponsor
First posted
Jun 26, 2019
Start date
May 6, 2019
Primary completion
Feb 26, 2020
Completion
Mar 6, 2020
Results posted
Oct 15, 2021
Last update
Oct 15, 2021

Study contacts

Frédérique Menzaghi, PhD
study director · Cara Therapeutics

Oversight

Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is completed, as verified in Sep 2021. You cannot join it, but the record below documents what was studied.

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