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Takeda PharmaceuticalA Study of Mezagitamab in Adults With Primary IgA Nephropathy Kidney Condition Phase 3 347 Offene Studie
A Phase 3 Multicenter, Randomized, Double-Blind, Placebo Controlled Trial to Evaluate Efficacy and Safety of Mezagitamab (TAK-079) in Study Participants With Primary IgA Nephropathy in Combination With Stable Background Therapy
- TAK-079-3001
- 2025-520825-19-00 (EU CTIS-Studiennummer)
Drug Therapy
| Teilnehmergruppe/Studienarm | Intervention/Behandlung |
|---|---|
ExperimentellMezagitamab Participants will receive mezagitamab injections, subcutaneously (SC), for approximately 22 weeks in each 52-week period. | Mezagitamab Mezagitamab injections administered SC. |
Placebo-VergleichspräparatPlacebo Participants will receive mezagitamab-matching placebo injections, SC for approximately 22 weeks in each 52-week period. | PLACEBO Mezagitamab-matching placebo injections administered SC. |
ExperimentellOpen-label Mezagitamab Participants will receive mezagitamab injections, SC for approximately 22 weeks in each 52-week period. | Mezagitamab Mezagitamab injections administered SC. |
| Ergebnismessung | Beschreibung der Messung | Zeitrahmen |
|---|---|---|
Change from Baseline in Proteinuria at Week 36 | Proteinuria will be assessed by urine protein to creatinine ratio (UPCR) calculated from a 24-hour urine collection. | From Baseline to Week 36 |
| Ergebnismessung | Beschreibung der Messung | Zeitrahmen |
|---|---|---|
Change from Baseline in Estimated Glomerular Filtration Rate (eGFR) at Week 52 and 104, Respectively | From Baseline to Weeks 52 and 104 | |
The Rate of Change in eGFR From Baseline at Weeks 52 and 104, Respectively | The rate of change in eGFR from baseline is measured as eGFR total slope. | From Baseline to Weeks 52 and 104 |
Time from Baseline to the First Occurrence of Any of the Pre-specified Kidney Failure Composite Assessment Criteria | The pre-specified assessment criteria will include: sustained decline in eGFR of ≥30% from baseline over at least 4 weeks; sustained eGFR \<15 mL/min/1.73 m\^2 over at least 4 weeks; initiation of maintenance dialysis defined as dialysis performed for at least 4 weeks; receipt of kidney transplant; or death from kidney failure. Time from baseline to first occurrence of any of the above assessment criteria would be reported. | From Baseline to Week 104 |
Change from Baseline in Proteinuria Levels at Week 104 | Proteinuria will be assessed by UPCR calculated from a 24-hour urine collection. | From Baseline to Week 104 |
Resolution of Hematuria at Weeks 36, 52 and 104, Respectively | Resolution of hematuria is defined as having a negative hematuria result at the specified visit among those participants with positive hematuria at Baseline. | Weeks 36, 52 and 104 |
Number of Participants With Antidrug Antibody (ADA) | Up to 104 weeks | |
Number of Participants With Neutralizing Antibody (NAb) | Up to 104 weeks | |
Serum Concentrations of Mezagitamab During and After Intervention | Pre-dose and at multiple time points post-dose, up to Week 104 |
To be eligible to participate in this trial, an individual must meet all the following criteria:
Either UPCR greater than or equal to (≥) 0.8 gram per gram (g/g) or urine protein excretion (UPE) ≥1 grams per day (g/day), calculated from a 24-hour urine collection during the screening period (only applicable for the main group).
eGFR greater than (>)30 milliliters per minute per 1.73 meter square (mL/min/1.73m^2) at screening based on the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) formula (only applicable for the main group).
No prior exposure to anti- cluster of differentiation 38 (CD38) therapy period (only applicable for the main group).
The participant is at least aged 18 years or the local legal age if greater than 18 years, inclusive.
The participant (and the participant's legally acceptable representative, if applicable per local regulations or determination) has provided informed consent (that is, in writing, documented via a signed and dated informed consent form \[ICF\]) and any required privacy authorization before the initiation of any clinical trial procedures.
Renal biopsy report supporting diagnosis of primary IgAN within 10 years before signing informed consent for the clinical trial. The redacted report must be made available for review. A renal biopsy may be performed during screening.
Participants must be on stable renin-angiotensin-aldosterone system (RAAS) inhibitor therapy with an angiotensin-converting enzyme inhibitor (ACE-I) and/or angiotensin receptor blocker (ARB) or endothelin receptor antagonist (ERA) or mineralocorticoid receptor antagonist (MRA) agent for at least 12 weeks before signing the ICF with dosing at the maximally tolerated or labeled dose as determined by the investigator, with the intent to continue stable dosing during the clinical trial. Those intolerant of RAAS inhibitor therapy are potentially eligible after consultation with the medical monitor. Intolerance is defined as a documented side effect causing discontinuation of the therapy.
Women of childbearing potential who are not pregnant during screening (confirmed by negative serum human chorionic gonadotropin \[hCG\]) and on Visit 1 before first dose of trial intervention (confirmed by negative urine pregnancy test).
Any one of the following (only applicable for the open-label cohort):
- Participants in Study TAK-079-1006 who completed the Week 96 visit or the retreatment period with either UPCR >0.5 g/g or UPE >0.5 g/d calculated from a 24-hour urine collection during the screening period and eGFR >30 mL/min/1.73m^2 at screening based on the CKD-EPI formula.
- UPCR <0.8 g/g and UPE ≥0.75 and <1.0 g/day, by 24-hour urine collection during the screening period and eGFR > 30 mL/min/1.73m^2 at screening based on the CKD-EPI formula.
- UPCR ≥ 0.8 g/g or UPE ≥ 1.0 g/d by 24-hour urine collection during the screening period and eGFR ≥25 and ≤30 mL/min/1.73m^2 at screening based on the CKD-EPI formula.
An individual who meets any of the following criteria will be excluded from participation in this trial:
Kidney biopsy exhibiting significant concomitant renal disease other than IgAN (for example, diabetic nephropathy, lupus nephritis, minimal change disease).
Secondary IgAN (such as with significant liver disease, immunoglobulin A (IgA) vasculitis, inflammatory bowel disease, and seronegative spondyloarthropathies).
Evidence of rapidly progressive glomerulonephritis (loss of ≥50% of eGFR within 3 months before the signing of the ICF).
Diagnosis of nephrotic syndrome defined as 24-hour proteinuria >3.5 g/day or hypoalbuminemia (<3.0 grams per deciliter \[g/dL\]) with or without peripheral edema.
Renal or other organ transplantation prior to or expected during the clinical trial.
Treatment with oral immunosuppressive agents (including cyclophosphamide, mycophenolate mofetil, cyclosporine, azathioprine, calcineurin inhibitors) or biologic therapy for immunomodulation (including immunomodulatory monoclonal or polyclonal antibodies) within 6 months (both B-cell and non-B-cell directed agents) before signing of the ICF.
If the participant has received anti-CD20 treatment, the participant is excluded if either of the following apply:
- The last dose was received within 6 months before the signing of the ICF.
- The last dose was received between 6 and 12 months before the signing of the ICF and the participant has a CD19+ count below the lower limit of normal.
Note: Participants who have received the last dose of anti-CD20 treatment >12 months before the signing of the ICF are not excluded from clinical trial participation based on this criterion and are not required to undergo CD19+ testing.
Use of systemic corticosteroids at an average dose of 40 milligrams (mg) prednisone equivalent or higher for more than 14 days within 4 months of the screening visit, or use of oral budesonide delayed release capsules within 1 year of the screening visit.
The participant has received a live or live-attenuated vaccine within 4 weeks before signing the ICF or has any live or live-attenuated vaccine planned during the clinical trial.
Participation in any other investigational drug trial (including vaccine trial) with receipt of at least 1 dose of investigational drug, or has been exposed to another investigational agent within 4 weeks or 5 half-lives, whichever is longer, before Visit 1.
The participant has active infection with hepatitis B virus (HBV), hepatitis C virus (HCV), or human immunodeficiency virus (HIV).
The participant has had any of the following types of infections within the specified timeframes where applicable:
- Active bacterial, viral, fungal infection (except for the common cold and onychomycosis), or any other serious infection within 2 weeks of signing the ICF. Any anti-infective course for infection must be completed at least 2 weeks before Visit 1.
- Severe Acute Respiratory Syndrome Coronavirus 2 (SARS CoV-2) infection within 4 weeks of signing the ICF.
- Opportunistic infection or treatment for an opportunistic infection lesser than or equal to (≤)12 weeks before signing the ICF.
In the opinion of the investigator, the participant is currently experiencing any medical condition that might interfere with participation in the trial (for example, significant ocular, cardiovascular, pulmonary, hematologic, gastrointestinal, endocrinologic, hepatic, renal, neurologic, malignancy, infectious disease, immunodeficiency, or alcohol and drug abuse), that poses an added risk for the participant or could confound the assessment of trial results.
In the opinion of the investigator, the participant has a serious medical or psychiatric illness that could potentially interfere with the completion of treatment.
The participant has a history of major surgery within 3 months before screening (or longer, at the discretion of the investigator); or, either has a planned tonsillectomy or underwent a tonsillectomy within 6 months before screening.
Note: Major surgery typically requires at least 1 night in the hospital.
History of malignancy (including myelodysplastic syndrome) within 5 years of signing the ICF, except for adequately treated non-melanoma skin cancer, superficial bladder cancer, and curatively treated cervical carcinoma-in-situ.
The participant has a history of a severe allergic or anaphylactic reaction to recombinant proteins or excipients used in the mezagitamab or placebo formulation.
The participant has (1) been diagnosed with or has suspected chronic obstructive pulmonary disease (COPD) or asthma and (2) has a prebronchodilatory forced expiratory volume in 1 second (FEV1) <50% of predicted normal at screening.
The participant is capable of breastfeeding but does not agree to forego breastfeeding from first dose of investigational medicinal product (IMP) through 30 days after the last dose of IMP.
The participant is an individual with potential for pregnancy but does not agree to use at least 1 form of highly effective contraception and 1 barrier method of contraception (preferably male condom) when engaging in heterosexual sex for the protocol specified duration after the last dose of IMP.
The participant is a sexually active, non-sterilized individual who produces sperm but does not agree to use a barrier method (preferably male condom) combined with at least 1 form of highly effective contraception for any partner(s) with potential for pregnancy when engaging in heterosexual sex for the protocol specified duration after the last dose of IMP.
In the investigator's opinion, the participant (and the participant's legally acceptable representative, if applicable per local regulations or determination) is unwilling and/or unable to understand and fully comply with clinical trial procedures and requirements (including digital tools and applications).
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