Uremic PruritusPhase 2NCT03802617
A Clinical Study of MR13A9 in Hemodialysis Patients With Pruritus.
A Phase 2 study testing MR13A9 in people with Uremic Pruritus, run by Kissei Pharmaceutical Co., Ltd. at 1 site in Japan.
Trial summary
Double-blind, Placebo-controlled study to evaluate the dose-response relationship of safety, efficacy and pharmacokinetics of MA13A9 in hemodialysis patients with pruritus. Read more about this study
- Who is it for?
- Ages 20 years and older
- Conditions the study is for
- Uremic Pruritus
- What is being tested?
- MR13A9
- Type of treatment
- Injection or infusion
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 247 participants
- Where
- 1 siteJapan
- Study dates
- 1 Feb 2019to 22 Oct 2019
- Phase
- Phase 2
- Are there results?
- Yes, posted in the registrySummary in the doctors' view
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 20 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Japanese with male or female aged ≥ 20
- Patient with Chronic Kidney Disease (CKD) has been on hemodialysis 3 times per week
- Patient receiving treatment for itch
- Patient has a baseline NRS score > 4
Who cannot join
- Patient has pruritus cause other than CKD or its complications
- Patients has hepatic cirrhosis
- Patient has a known history of allergic reaction to opiates
Trial locations and contacts
1 site in 1 country.
About this study
Official title: A Phase II Clinical Study of MR13A9 in Hemodialysis Patients With Pruritus.
Double-blind, Placebo-controlled study to evaluate the dose-response relationship of safety, efficacy and pharmacokinetics of MA13A9 in hemodialysis patients with pruritus.
- Conditions
- Uremic Pruritus
- Being tested
- MR13A9, Placebo
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
MR13A9Drug
Intravenous administration
PlaceboDrug
Intravenous administration
| Study group | Role | What they receive |
|---|---|---|
| MR13A9 low dose | Experimental | Not described Receives: Drug: MR13A9 |
| MR13A9 medium dose | Experimental | Not described Receives: Drug: MR13A9 |
| MR13A9 high dose | Experimental | Not described Receives: Drug: MR13A9 |
| Placebo | Placebo comparator | Not described Receives: Drug: Placebo |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change From Baseline in the Mean NRS Score at Week 8 of the Treatment Period
The primary analysis was performed using an MMRM with change from baseline in the mean NRS score at each time point as an objective variable; treatment group, time point, and treatment group-by-time point interaction as fixed effects; baseline mean NRS score and dynamic allocation factors, presence of prior treatment with nalfurafine hydrochloride, and presence of specific signs or symptoms to be confirmed in the screening period, as covariates; and subject as a random effect.
Looking back on the period between the time of awakening on the previous day of assessment and the time of awakening on the day of assessment (including sleeping hours) once daily, subjects will assess the NRS score for the most severe itching by themselves. The most severe itching within the day will be assessed in integer on a scale ranging from 0 to 10, where 0 represents no itching and 10 represents worst itching imaginable.
Measured: 8 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted14 Jan 2019
- Study start1 Feb 2019
- Primary completion22 Oct 2019
- Study completion22 Oct 2019
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Uremic PruritusStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 2
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind
- Who is masked
- Participant, Investigator
- Enrolment
- 247 participants (actual)
Sponsor and investigators
- Lead sponsor
- Kissei Pharmaceutical Co., Ltd.
- Sponsor type
- Industry (pharma, biotech, devices)
- Collaborators
- Maruishi Pharmaceutical
- Responsible party
- Sponsor
- Investigators
- Naomi Koshihara, Study director, Clinical Development Div.
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT03802617
- Sponsor's protocol ID
- MR13A9-4
- Status last verified
- Feb 2021
- First submitted
- 10 Jan 2019
- Last updated
- 5 Dec 2025
- Results posted
- Yes, on ClinicalTrials.gov
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Narita I, Tsubakihara Y, Uchiyama T, Okamura S, Oya N, Takahashi N, Gejyo F; MR13A9-4 Trial Investigators. Efficacy and Safety of Difelikefalin in Japanese Patients With Moderate to Severe Pruritus Receiving Hemodialysis: A Randomized Clinical Trial. JAMA Netw Open. 2022 May 2;5(5):e2210339. doi: 10.1001/jamanetworkopen.2022.10339.
PubMed 35511180
Study at a glance
From the registry record, last updated by the sponsor on 5 Dec 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Phase II Clinical Study of MR13A9 in Hemodialysis Patients With Pruritus.
- ClinicalTrials.gov ID
- NCT03802617
- Acronym / sponsor ID
- MR13A9-4
- Conditions
- Uremic Pruritus
- Phase
- Phase 2
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 247 participants (actual)
- Lead sponsor
- Kissei Pharmaceutical Co., Ltd.Industry (pharma, biotech, devices)
- Collaborators
- Maruishi Pharmaceutical
- Study start
- 1 Feb 2019 (actual)
- Primary completion
- 22 Oct 2019 (actual)
- Study completion
- 22 Oct 2019 (actual)
- First posted
- 14 Jan 2019 (actual)
- Results
- Posted 5 Dec 2025
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Double-blind, Placebo-controlled study to evaluate the dose-response relationship of safety, efficacy and pharmacokinetics of MA13A9 in hemodialysis patients with pruritus.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind (participant, investigator)
- Number of arms
- 4
| Arm | Type | Receives |
|---|---|---|
| MR13A9 low dose | Experimental | Drug: MR13A9 |
| MR13A9 medium dose | Experimental | Drug: MR13A9 |
| MR13A9 high dose | Experimental | Drug: MR13A9 |
| Placebo | Placebo comparator | Drug: Placebo |
Who may qualify
- Ages
- 20 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- Japanese with male or female aged ≥ 20
- Patient with Chronic Kidney Disease (CKD) has been on hemodialysis 3 times per week
- Patient receiving treatment for itch
- Patient has a baseline NRS score > 4
Key exclusion criteria (3 listed)
- Patient has pruritus cause other than CKD or its complications
- Patients has hepatic cirrhosis
- Patient has a known history of allergic reaction to opiates
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| MR13A9Intravenous administration | Drug | MR13A9 high dose, MR13A9 low dose, MR13A9 medium dose |
| PlaceboIntravenous administration | Drug | Placebo |
Primary outcome
Change From Baseline in the Mean NRS Score at Week 8 of the Treatment Period
Time frame: 8 weeks
The primary analysis was performed using an MMRM with change from baseline in the mean NRS score at each time point as an objective variable; treatment group, time point, and treatment group-by-time point interaction as fixed effects; baseline mean NRS score and dynamic allocation factors, presence of prior treatment with nalfurafine hydrochloride, and presence of specific signs or symptoms to be confirmed in the screening period, as covariates; and subject as a random effect. Looking back on the period between the time of awakening on the previous day of assessment and the time of awakening on the day of assessment (including sleeping hours) once daily, subjects will assess the NRS score for the most severe itching by themselves. The most severe itching within the day will be assessed in integer on a scale ranging from 0 to 10, where 0 represents no itching and 10 represents worst itching imaginable.
Results and safety
Loading the posted results from ClinicalTrials.gov…
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 5 Dec 2025.
- Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
- Derived from this study: PubMed 35511180Narita I, Tsubakihara Y, Uchiyama T, Okamura S, Oya N, Takahashi N, Gejyo F; MR13A9-4 Trial Investigators. Efficacy and Safety of Difelikefalin in Japanese Patients With Moderate to Severe Pruritus Receiving Hemodialysis: A Randomized Clinical Trial. JAMA Netw Open. 2022 May 2;5(5):e2210339. doi: 10.1001/jamanetworkopen.2022.10339.
Related trials for Uremic Pruritus
Active, not recruitingObservational study
Cardiovascular and Bone Mineral Markers in Dialysis Patients and Healthy Controls
End-Stage Kidney Disease (ESKD), Hemodialysis
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Naomi Koshihara study director
Clinical Development Div.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 2 study testing MR13A9 in people with Uremic Pruritus, run by Kissei Pharmaceutical Co., Ltd. at 1 site in Japan.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 3 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 5 Dec 2025. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Japan. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
Yes. Results are posted in the registry (first posted 5 Dec 2025). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Change From Baseline in the Mean NRS Score at Week 8 of the Treatment Period (time frame: 8 weeks). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT03802617, which also lists 1 linked publication.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 5 Dec 2025.