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IgA NephropathyPhase 2ASSISTNCT05834738

Randomized, Double-blind, Placebo-controlled, Crossover Study of Atrasentan in Subjects With IgA Nephropathy

A Phase 2 study testing Atrasentan in people with IgA Nephropathy and Immunoglobulin A Nephropathy, run by Novartis Pharmaceuticals at 30 sites in 6 countries.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
Search all trials

Trial summary

The ASSIST study was a phase 2, double-blind, placebo-controlled crossover study to evaluate the safety and efficacy of atrasentan vs. placebo in subjects with IgA nephropathy (IgAN) while on background standard of care therapy and an SGLT2 inhibitor (SGLT2i). Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
IgA Nephropathy, Immunoglobulin A Nephropathy
What is being tested?
Atrasentan
Type of treatment
Pill or oral medicine
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
54 participants
Where
30 sitesin 6 countries
Study dates
20 Jul 2023to 29 Oct 2025
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 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Legal adults (per local and country specifications) ≥ 18 years of age at the time of signing the informed consent form (ICF) prior to initiation of any study specific activities/procedures.
  • Biopsy-proven IgA nephropathy.
  • Receiving a maximally tolerated and stable dose of a RASi for at least 12 weeks prior to screening. Investigator discretion should be used in determining maximally tolerated and optimized dose.
  • eGFR of at least 30 mL/min/1.73 m^2 at screening based on the 2021 CKD-EPI equation.
  • Willing to agree to highly effective forms of contraception, as specified in the protocol, throughout the study and for up to 1 month afterward. In WOCBP, use of hormonal contraceptive agents must have been started at least 1 month prior to baseline.
  • Willing and able to provide informed consent and comply with all study requirements.
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  • Receiving a stable dose of an SGLT2i for at least 8 weeks prior to screening
  • Must have a 24-hour urine protein of >0.5 grams/day.
  • Must have a 24-hour total urine protein of >0.85 grams/day at screening
  • Willing to participate in an 8-week run-in period with an SGLT2i (per Investigator choice)
  • Additional Inclusion Criteria for Run-in Subjects at the end of Run-In
  • Must have completed the 8-week run-in period on a stable and well tolerated dose of an SGLT2i
  • Must have a 24-hour total urine protein of >0.5 grams/day confirmed at the Run-in Week 8 visit.
  • Must have an eGFR of ≥ 30 mL/min/1.73 m^2 based on the CKD-EPI equation at their Run-in Week 8 visit.

Who cannot join

  • Current diagnosis with another chronic kidney disease, including diabetic kidney disease.
  • History of kidney transplantation or other organ transplantation.
  • Use of systemic immunosuppressant medications, such as steroids, for more than 2 weeks in the past 3 months.
  • Blood pressure above 150 mmHg systolic or 95 mmHg diastolic as evaluated by the Investigator.
  • Known history of heart failure or prior hospital admissions for conditions relating to fluid overload that in the opinion of the Principal Investigator or Sponsor might confound the results of the study or pose additional risk to the participant by their participation in the study.
  • Clinically significant history of liver disease as assessed by the Investigator.
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  • Hemoglobin below 9 g/dL as measured by the Investigator or prior history of blood transfusion for anemia within the past 3 months.
  • Malignancy within the past 5 years. Exceptions to this criteria include nonmelanoma skin cancer and curatively treated cervical carcinoma in situ.
  • For women, pregnancy, breast feeding, or intent to become pregnant during the study. and at least 1 month afterward.
  • For men, intent to father a child or donate sperm during the study.
  • Have received any investigational agent or approved treatment for IgAN (other than a RAS inhibitor) including SGLT2i (except for subjects in the SGLT2i stable stratum) within 1 month (or 5 half-lives of the agent, whichever is longer) prior to Screening. If the investigational agent is a cytotoxic or immunosuppressive agent then this washout period is 6 months.

Trial locations and contacts

30 sites in 6 countries.

30 sites in 6 countries

Spain8 sites
  • Hospital Torrecardenas

    Almería, 04009

  • Hospital del Mar

    Barcelona, 08003

  • Hospital del Vall d´Hebron

    Barcelona, 08035

  • Hospital Ribera Polusa

    Lugo, 27004

  • Hospital Universitario De Getafe (HUG)

    Madrid, 28009

  • Hospital 12 de Octubre

    Madrid, 28041

  • Hospital Virgen Macarena

    Seville, 41009

  • Hospital Clinico Universitario

    Valencia, 46010

Other trials in Spain

United States6 sites
  • Fides Clinical Research

    Atlanta, Georgia, 30342

  • University of Alabama at Birmingham (UAB) - The Kirklin Clinic (TKC) - Nephrology Clinic

    Birmingham, Alabama, 35233

  • Tufts Medical Center

    Boston, Massachusetts, 02111

  • University of North Carolina at Chapel Hill - Nephrology and Hypertension

    Chapel Hill, North Carolina, 27599

  • NANI Research

    Oak Brook, Illinois, 60523

  • University of Pennsylvania

    Philadelphia, Pennsylvania, 19104

Other trials in United States

Australia4 sites
  • The St. George Hospital

    Kogarah, New South Wales, 2217

  • Monash Health- Monash Medical Centre

    Melbourne, Victoria, 3168

  • Sunshine Hospital

    St Albans, Victoria, 3021

  • Prince of Wales Hospital

    Sydney, New South Wales, 2031

Other trials in Australia

Brazil4 sites
  • NUPEC Cardio

    Belo Horizonte, Minas Gerais, 30220-140

  • Santa Casa de Misericordia de Porto Alegre

    Porto Alegre, Rio Grande do Sul, 90035-074

  • Universidade Federal de Sao Paulo

    São Paulo, São Paulo, 04038-002

  • Hospital das Clinicas da Faculdade de Medicina da USP

    São Paulo, São Paulo, 05403-000

Other trials in Brazil

Malaysia4 sites
  • Universiti Kebangsaan Malaysia (UKM) - Medical Centre (Pusat Perubatan) (Hospital Canselor Tuanku Muhriz (HCTM))

    Cheras, Kuala Lumpur, 56000

  • Hospital Raja Permaisuri Bainun (HRPB)

    Ipoh, Perak, 30450

  • Hopsital Sultanah Aminah Johor Bharu (HSAJB) - Bangunan Bakawali Heodialysis Centre

    Johor Bahru, Johor Darul Takzim, 80100

  • University Malaya Medical Centre

    Kuala Lumpur, Kuala Lumpur, 59100

Other trials in Malaysia

South Korea4 sites
  • Hallym University Sacred Heart Hospital

    Anyang-si, Gyeonggi-do, 14068

  • Dong-A University Medical Center (Dong-A University Hospital)

    Busan, Busan, 49201

  • Soon Chun Hyang Central Medical Center (SCHMC) - Soon Chun Hyang University Hospital

    Cheonan, Chungnam-Do, 31151

  • Chung-Ang University College

    Seoul, Seoul, 06973

Other trials in South Korea

About this study

Official title: A Randomized, Double-blind, Placebo-controlled, Crossover Study of Atrasentan in Subjects With IgA Nephropathy on Sodium-glucose Cotransporter-2 Inhibitors (SGLT2i)

The ASSIST study was a phase 2, double-blind, placebo-controlled crossover study to evaluate the safety and efficacy of atrasentan vs. placebo in subjects with IgA nephropathy (IgAN) while on background standard of care therapy and an SGLT2 inhibitor (SGLT2i).

Read the detailed description

Patients with biopsy-proven IgAN who were on a background SGLT2i and a maximally tolerated and stable dose of a renin-angiotensin system inhibitor (RASi) [such as angiotensin converting enzyme inhibitor (ACEi) or angiotensin-receptor antagonist (ARB)] as part of standard of care, were randomized to either sequence Atrasentan/Placebo or sequence Placebo/Atrasentan in which they received 0.75 mg atrasentan once daily during one period (period A), complete a 12-week washout period, and then received matching placebo during the other period (period B) as determined by the randomization schema.

Subjects who were not on background SGLT2i therapy would first undergo a run-in period of 8 weeks with an SGLT2i with a 24-hour total urine protein of > 0.85 grams/day at screening prior to the run-in period and have 24-hour total urine protein of > 0.5 grams/day at the end of the run-in period to be eligible for randomization.

Subjects remained on their maximally tolerated and stable dose of RASi and stable dose of SGLT2i therapies for the duration of the study following randomization.

The primary objective of the study was to evaluate the efficacy of atrasentan vs. placebo while on background therapy with SGLT2i.

Being tested
Atrasentan, Placebo
Keywords
Kidney Diseases, Kidney Disease, Chronic, Urologic Diseases, Glomerulonephritis, Glomerular Disease, Glomerulonephritis, IGA, Glomerulopathy, Immunoglobulin Disease
Medical subject headings
Glomerulonephritis, IGA, Kidney Diseases, Renal Insufficiency, Chronic, Urologic Diseases, Glomerulonephritis

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • AtrasentanDrug

    Also called CHK-01, Atrasentan Hydrochloride, ABT-627

    Period A (12 Weeks) - Film-coated tablet, Washout Period: 12 weeks, Period B (24 Weeks) - Placebo

  • AtrasentanDrug

    Also called CHK-01, Atrasentan Hydrochloride, ABT-627

    Period B (12 Weeks) - Placebo, Washout Period: 12 weeks, Period A (24 Weeks) - Film-coated tablet

  • PlaceboDrug

    Placebo

Study groups in NCT05834738
Study groupRoleWhat they receive
Sequence Atrasentan/PlaceboExperimentalOnce daily oral administration of 0.75 mg atrasentan for 12 weeks (Period A) followed by once daily oral administration of placebo for 24 weeks (Period B)
Receives: Drug: Atrasentan; Drug: Placebo
Sequence Placebo/AtrasentanExperimentalOnce daily oral administration of placebo for 12 weeks (Period B) followed by once daily oral administration of 0.75 mg atrasentan for 24 weeks (Period A)
Receives: Drug: Atrasentan; Drug: Placebo

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Percentage Change in Proteinuria (UPCR From a 24-Hour Urine Collection) From Baseline to Week 12

    Change in proteinuria from Baseline to Week 12 across both periods between atrasentan versus placebo. Proteinuria was assessed using the urine protein to creatinine ratio (UPCR) measured from a 24-hour urine collection.

    Measured: From Baseline to Week 12

Secondary outcomes (3)
  1. Percentage Change in Proteinuria (UPCR From a 24-Hour Urine Collection) From Baseline to Week 24 in Treatment Period 2.

    Change in proteinuria from Baseline to Week 24 in Treatment Period 2 between atrasentan versus placebo. Proteinuria was assessed using the urine protein to creatinine ratio (UPCR) measured from a 24-hour urine collection.

    Measured: From Baseline to Week 24 of Treatment Period 2

  2. Number of Subjects With TEAE and TEAESI

    Number of Subjects With Treatment-Emergent Adverse Events (TEAE) and Treatment-Emergent Adverse Events of Special Interest (TEAESI). Severity assessment of AEs was based on CTCAE (Common Terminology Criteria for Adverse Events).

    Measured: From first dose of study treatment until end of study, up to 60 weeks

  3. Plasma Concentration of Atrasentan

    Blood samples were collected for the measurement of plasma concentrations of atrasentan.

    Measured: Treatment Period 1: Pre-dose on Weeks 2, 6 and 12; Treatment Period 2: Pre-dose on Weeks 2, 6, 12 and 24

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted28 Apr 2023
  2. Study start20 Jul 2023
  3. Primary completion30 Jun 2025
  4. Study completion29 Oct 2025

Resources

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
Crossover
Masking
Triple blind
Who is masked
Participant, Care provider, Investigator
Enrolment
54 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05834738
Sponsor's protocol ID
CEXV811A12201
Other IDs
CHK01-03, 2023-503828-13-00, 2023
Acronym
ASSIST
Status last verified
Jun 2026
First submitted
18 Apr 2023
Last updated
20 Jul 2026
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
Yes: Novartis is committed to sharing with qualified external researchers, access to patient-level data and supporting clinical documents from eligible studies. These requests are reviewed and approved by an independent expert panel on the basis of scientific merit. All data provided is anonymized to respect the privacy of patients who have participated in the trial in line with applicable laws and regulations. This trial data is currently available according to the process described on www.clinicalstudydatarequest.com.

Publications

  • Heerspink HJL, Noronha IL, Gorriz JL, Lim SK, Kotwal SS, Kirsztajn GM, Barros Neto J, Ryan J, Fu MS, Kim SG, Barratt J, Brahmbhatt Y, Housler GJ, Jiao R, Dahlke M, Lodha A, Mottl AK; Atrasentan and Sodium Glucose Cotransporter-2 Inhibitor Efficacy and Safety Trial (ASSIST) Investigator Group. Efficacy and Safety of Atrasentan in Patients with IgA Nephropathy Receiving Sodium-Glucose Cotransporter 2 Inhibitors: Placebo-Controlled, Crossover Trial. J Am Soc Nephrol. 2026 Mar 29. doi: 10.1681/ASN.0000001076. Online ahead of print.

    PubMed 41904616
  • Tunnicliffe DJ, Reid S, Craig JC, Samuels JA, Molony DA, Strippoli GF. Non-immunosuppressive treatment for IgA nephropathy. Cochrane Database Syst Rev. 2024 Feb 1;2(2):CD003962. doi: 10.1002/14651858.CD003962.pub3.

    PubMed 38299639

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Atrasentan in people with IgA Nephropathy and Immunoglobulin A Nephropathy, run by Novartis Pharmaceuticals at 30 sites in 6 countries.

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 14 inclusion and 11 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 20 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 30 sites in Spain, United States, Australia, Brazil, Malaysia and 1 more country. 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. 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 20 Jul 2026). 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?

Percentage Change in Proteinuria (UPCR From a 24-Hour Urine Collection) From Baseline to Week 12 (time frame: From Baseline to Week 12). 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 NCT05834738, which also lists 2 linked publications.

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 20 Jul 2026.

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