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CompletedNCT03461146Updated Apr 6, 2026Results posted

Efficacy and Safety Study to Evaluate MT-6548 in Hemodialysis Subjects Not Receiving ESAs With Anemia Associated With Chronic Kidney Disease in Japan

A Phase 3 interventional study of MT-6548 in Anemia; Hemodialysis Dependent Chronic Kidney Disease, sponsored by Tanabe Pharma Corporation. Completed at 16 sites in Japan. Open to participants aged 20 Years and older. Per ClinicalTrials.gov, last updated 2026-04-06.

Sponsored by Tanabe Pharma Corporation · Phase 3, Interventional, and Treatment

Phase
Phase 3
Study type
Interventional
Enrollment
24
Allocation
Not applicable
Ages
20 Years and older
Sex
All
01

Study summary

For hemodialysis subjects not receiving ESAs with anemia associated with chronic kidney disease, evaluate Hb correction and maintenance effect and safety of MT-6548.

02

Conditions studied

  • Anemia; Hemodialysis Dependent Chronic Kidney Disease

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03

In context

Anemia

1,810 studies on the registry are indexed under Anemia; 215 are open to participants now.

This study's enrollment of 24 is below the median of 117 across 1,336 interventional studies indexed under Anemia.

Browse Anemia studies →

Lead sponsor

Tanabe Pharma Corporation is the lead sponsor of 92 studies on the registry; 1 is open to participants now.

Of its 8 completed or terminated interventional studies of FDA-regulated products, 6 (75%) have results posted.

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

04

Who can participate

Ages eligible
20 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Diagnosis of CKD
  • Receiving hemodialysis or hemodiafiltration 3 times a week for more than 12 weeks prior to the screening period, excluding receiving home dialysis or combination of peritoneal dialysis.
  • Not being treated with ESAs or if being treated with ESAs, leave defined interval between last ESAs administration and the first day of the screening period
  • Mean of the two screening levels closest in time to the baseline visit is ≥8.0 g/dL and \<10.0 g/dL
  • Fluctuation between the two Hb levels closest in time to the baseline visit during the screening period less than 1.5 g/dL
  • Serum ferritin ≥ 100 ng/mL, or TSAT ≥20% during the screening period
  • Folate and vitamin B12 ≥ lower limit of normal during the screening period

Exclusion criteria

Exclusion Criteria:

  • Anemia due to a main cause other than CKD: sickle cell disease, myelodysplastic syndrome, bone marrow fibrosis, hematologic , hemolytic anemia, thalassemia, or pure red cell aplasia
  • Active bleeding or recent blood loss within 8 weeks prior to the screening period
  • RBC transfusion within 8 weeks prior to the screening period
  • Received testosterone enanthate or mepitiostane within 8 weeks prior to the screening period
  • , ALT, or total >2.5 x during the screening period
  • Uncontrolled hypertension (diastolic blood pressure >110 mm Hg or systolic blood pressure >180 mm Hg) at the first day of the screening period and Day 1
  • Ophthalmic examinations during the screening period correspond to either of the following criteria;

    • No available fundal findings
    • Findings indicating the presence of active fundal disease
  • Severe heart failure ( Class IV)
  • Cerebrovascular disorder or acute coronary syndrome (hospitalization due to unstable angina or myocardial infarction), requiring hospitalization due to urgent percutaneous intervention for coronary or heart failure within 12 weeks prior to the screening period
  • Current or history of malignancy. History of malignancy with no recurrence for the recent 5 years is not an exclusion criterion
  • New onset or recurrent event of deep vein thrombosis or pulmonary embolism within 12 weeks prior to the screening period
  • Current or history of hemosiderosis or hemochromatosis
  • History of prior organ transplantation or scheduled organ transplant, or prior transplantation of hematopoietic stem cell or bone marrow
  • Males and females of who are unwilling to use an acceptable method of during the designated period (Males: during the study and 90 days after the last dose, females: during study and 30 days after the last dose)
  • Females who are pregnant or breast feeding, or are predicted to be pregnant
Terms in these criteria, in plain language(8)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Hemoglobin (Hb)

The protein in red blood cells that carries oxygen. A low level is anaemia, which can cause tiredness and breathlessness. Measured in g/dL or g/L (9 g/dL is 90 g/L).

Cancer (malignancy)

Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.

Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.

ALT and AST (liver enzymes)

Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.

Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.

Bilirubin

A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.

Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.

ULN (upper limit of normal)

The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.

“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.

NYHA class (heart failure)

The New York Heart Association’s four classes of how much heart failure limits physical activity.

I
No limits: ordinary activity causes no undue tiredness or breathlessness.
II
Slight limits: comfortable at rest, ordinary activity causes symptoms.
III
Marked limits: comfortable at rest, less than ordinary activity causes symptoms.
IV
Symptoms even at rest; any activity makes them worse.

Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.

Childbearing potential

Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).

Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.

Contraception

Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.

Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.

05

Study design

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

Study arms

  • Experimental
    MT-6548

    Drug: MT-6548

Interventions

  • Oral tablet

    Also known as: vadadustat, AKB-6548

06

What researchers measure

Primary outcomes

  1. Mean Hb Level of Week 20 and Week 24

    Time frame: Up to Week 24

  2. Hb Level at Each Assessment Time Point

    Time frame: Up to Week 24

  3. Percentage of Subjects With Hb Level at Each Assessment Time Point Within the Target Range During the Treatment Period

    Time frame: Up to Week 24

  4. Time to Reach the Target Hb Range

    Time frame: Up to Week 24

  5. Rate of Increase in Hb Level

    Time frame: Up to Week 6

07

Results

Posted May 7, 2021

Participant flow

Participant flow — Overall Study
MilestoneMT-6548
Started24
Completed21
Not completed3
Withdrew: Adverse event2
Withdrew: Physician decision1

Outcome measures

PrimaryMean Hb Level of Week 20 and Week 24
Time frame:
Up to Week 24
Reported as:
Least squares mean · g/dL
Mean Hb Level of Week 20 and Week 24
g/dLMT-6548
Mean Hb Level of Week 20 and Week 2410.75 (10.35 to 11.14)
PrimaryHb Level at Each Assessment Time Point
Time frame:
Up to Week 24
Reported as:
Mean · g/dL
Hb Level at Each Assessment Time Point
g/dLMT-6548
Baseline9.15 (8.73 to 9.57)
Week 29.25 (8.83 to 9.68)
Week 49.53 (9.03 to 10.04)
Week 69.90 (9.37 to 10.43)
Week 810.33 (9.80 to 10.85)
Week 1010.56 (10.08 to 11.04)
Week 1210.68 (10.18 to 11.19)
Week 1611.17 (10.66 to 11.68)
Week 2011.08 (10.73 to 11.43)
Week 2411.03 (10.60 to 11.45)
Week 24 (LOCF)10.56 (9.95 to 11.17)
PrimaryPercentage of Subjects With Hb Level at Each Assessment Time Point Within the Target Range During the Treatment Period
Time frame:
Up to Week 24
Reported as:
Number · percentage of subjects
Percentage of Subjects With Hb Level at Each Assessment Time Point Within the Target Range During the Treatment Period
percentage of subjectsMT-6548
Baseline16.7
Week 221.7
Week 436.4
Week 647.6
Week 855.0
Week 1063.2
Week 1268.4
Week 1663.2
Week 2078.9
Week 2473.7
PrimaryTime to Reach the Target Hb Range
Time frame:
Up to Week 24
Reported as:
Mean · days
Time to Reach the Target Hb Range
daysMT-6548
Time to Reach the Target Hb Range67.2 (45.8 to 88.6)
PrimaryRate of Increase in Hb Level
Time frame:
Up to Week 6
Reported as:
Mean · g/dL/week
Rate of Increase in Hb Level
g/dL/weekMT-6548
Calculated based on Hb at baseline and Week 40.05 (-0.05 to 0.16)
Calculated based on Hb up to Week60.09 (0.01 to 0.17)

Adverse events

Collected over 24 weeks. Non-serious events are listed at a 5% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
MT-65480/24 (0%)7/24 (29.2%)15/24 (62.5%)
Most frequent serious events
Most frequent serious events
EventMT-6548
Duodenal ulcer haemorrhageGastrointestinal disorders1/24
PneumoniaInfections and infestations1/24
Arteriovenous fistula occlusionInjury, poisoning and procedural complications1/24
Clavicle fractureInjury, poisoning and procedural complications1/24
Pelvic fractureInjury, poisoning and procedural complications1/24
Shunt stenosisInjury, poisoning and procedural complications1/24
Vascular access malfunctionInjury, poisoning and procedural complications1/24
AneurysmVascular disorders1/24
Peripheral arterial occlusive diseaseVascular disorders1/24
Most frequent other events
Most frequent other events
EventMT-6548
NasopharyngitisInfections and infestations5/24
Shunt stenosisInjury, poisoning and procedural complications5/24
DiarrhoeaGastrointestinal disorders4/24
Skin abrasionInjury, poisoning and procedural complications3/24
VomitingGastrointestinal disorders2/24

Baseline characteristics

Age, Categorical
Age, Categorical(Participants)MT-6548
<=18 years0
Between 18 and 65 years11
>=65 years13
Sex: Female, Male
Sex: Female, Male(Participants)MT-6548
Female5
Male19
Race/Ethnicity, Customized
Race/Ethnicity, Customized(Participants)MT-6548
Asian (Japanese)24
Asian (Other)0
Other0
08

Study locations

16 sites
  • Research site
    Aichi, Japan
  • Research site
    Chiba, Japan
  • Research site
    Fukushima, Japan
  • Research site
    Gunma, Japan
  • Research site
    Hokkaido, Japan
  • Research site
    Hyōgo, Japan
  • Research site
    Ibaraki, Japan
  • Research site
    Kagoshima, Japan
  • Research site
    Nagano, Japan
  • Research site
    Okayama, Japan
  • Research site
    Okinawa, Japan
  • Research site
    Osaka, Japan
  • Research site
    Saitama, Japan
  • Research site
    Shiga, Japan
  • Research site
    Shizuoka, Japan
  • Research site
    Yamagata, Japan
09

References and documents

Publications

  • Nangaku M, Kondo K, Takabe S, Ueta K, Tandai T, Kawaguchi Y, Komatsu Y. A phase 3, open-label, single-arm study of vadadustat for anemia in chronic kidney disease for Japanese patients on hemodialysis not receiving erythropoiesis-stimulating agents. Ther Apher Dial. 2022 Feb;26(1):45-54. doi: 10.1111/1744-9987.13699. Epub 2021 Jun 28. PubMed 34115437 ↗

Study documents

PDFs hosted by the registry, ClinicalTrials.gov.

10

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Apr 6, 2026, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT03461146
Responsible party
Sponsor
First posted
Mar 9, 2018
Start date
Mar 5, 2018
Primary completion
Dec 3, 2018
Completion
Dec 17, 2018
Results posted
May 7, 2021
Last update
Apr 6, 2026

Study contacts

General Manager
study director · Tanabe Pharma Corporation

Oversight

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

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Studies of the drug tested here: Vadadustat

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