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Zigakibart

Phase 3

IgA Nephropathy | Small molecule | Nephrology |Novartis AG|Trials Updated: Oct 21, 2026

Zigakibart development status

Highest phase Phase 3
Registered trials 8 across 2 sponsors since May 2019

Zigakibart target and mechanism

ModalitySmall molecule

Also known as BION-1301, BION-1301 Single Dose, FUB523, BION-1301 Multiple Doses

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials5
Total Enrollment1,078

FDA Designations

No designations recorded

Zigakibart clinical trials

Zigakibart · 5 trials · 12 indications

Phase 3 3Phase 2 1Phase 1 1
NCT07850752A Study of the Efficacy and Safety of Zigakibart + Atrasentan in Adult Patients With Primary IgA NephropathyIgA Nephropathy (IgAN)
NOT YET_RECRUITING340 Analytics
NCT06858319Open-label Extension Study of Zigakibart in Adults With IgA Nephropathy.Kidney Diseases
RECRUITING220 Analytics
NCT05852938A Study of Zigakibart in Adults With IgA NephropathyIgA Nephropathy
ACTIVE NOT_RECRUITING383 Analytics
PHASE3NOT YET_RECRUITING
A Study of the Efficacy and Safety of Zigakibart + Atrasentan in Adult Patients With Primary IgA Nephropathy
IgA Nephropathy (IgAN)Unlock trial analytics
PHASE3RECRUITING
Open-label Extension Study of Zigakibart in Adults With IgA Nephropathy.
Kidney DiseasesUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
A Study of Zigakibart in Adults With IgA Nephropathy
IgA NephropathyUnlock trial analytics

Study Endpoints

Primary Endpoints

Change in proteinuria from Baseline to Week 36, based on 24 hour urine collection
Baseline, Week 36

Relative difference between treatment groups in mean change of natural log 24-hour UPCR from Baseline to Week 36, expressed as percent reduction

Number of participants with adverse events.
Date of first administration of study treatment to 24 weeks after the date of the last actual administration of study treatment

Number of participants with adverse events will be provided.

Number of participants with serious adverse events.
Date of first administration of study treatment to 24 weeks after the date of the last actual administration of study treatment

Number of participants with serious adverse events will be provided.

Number of participants with adverse events of special interest.
Date of first administration of study treatment to 24 weeks after the date of the last actual administration of study treatment

Number of participants with adverse events of special interest will be provided.

Change from baseline in eGFR
Baseline and 104 weeks or approximately 2 years

Change from Baseline to Week 104 in eGFR using the CKD-EPI 2021 creatinine equation

Change in mesangial IgA deposition
Baseline to Week 53 or 105

Change in mesangial IgA deposition as assessed by intensity of immunofluorescence staining

Number of participants with Treatment Emergent Adverse Events (TEAEs) and treatment-emergent serious adverse events (SAEs)
Up to 276 weeks

TEAEs and SAEs are assessed throughout each participant's study participation according to the National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE).

Change from baseline in systolic and diastolic blood pressure
Baseline and up to 276 weeks.
Change from baseline in estimated glomerular filtration rate (eGFR)
Baseline and up to 276 weeks

Secondary Endpoints

Rate of patients achieving proteinuria remission at Week 52
Week 52
Rate of proteinuria remission
Week 52
Proportion of participants with AEs, SAEs and AESIs
128 Weeks
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
zigakibart + atrasentanEXPERIMENTALPatients receive zigakibart and atrasentan
zigakibart + placeboACTIVE_COMPARATORPatients receive zigakibart and matching placebo
zigakibartEXPERIMENTALParticipants will receive zigakibart.
BION-1301EXPERIMENTAL600mg subcutaneous administration every 2 weeks for 104 weeks
PlaceboPLACEBO_COMPARATORsubcutaneous administration every 2 weeks for 104 weeks
Part 1: BION-1301EXPERIMENTALUp to 5 cohorts with single ascending doses of BION-1301 administered by intravenous (IV) infusion in healthy volunteers.
Part 1: PlaceboPLACEBO_COMPARATORHealthy Volunteers receive a single dose of placebo administered by IV infusion.
Part 2: BION-1301EXPERIMENTALUp to 4 cohorts with multiple doses of BION-1301 administered by intravenous (IV) infusion in healthy volunteers.
Part 2: PlaceboPLACEBO_COMPARATORHealthy Volunteers receive placebo by IV infusion.
Part 3: BION-1301EXPERIMENTALTwo cohorts of participants with IgAN receive multiple doses of BION-1301 by IV infusion (Cohort 1) or SC injection (Cohort 2) at 600mg/biweekly.
Part 4 Retreatment: BION-1301EXPERIMENTALEligible participants with IgAN from Part 3 may enroll in Part 4 due to disease progression or by choice for optional retreatment and receive SC injection at 600mg/biweekly.

Interventions

NameTypeDescription
zigakibartBIOLOGICALSolution for injection via PFS-NSD
atrasentanDRUGTablet
PlaceboDRUGTablet
BION-1301DRUGBION-1301 Pre-Filled Syringe (PFS) 600mg subcutaneous administration every 2 weeks for 104 weeks.
BION-1301 Single DoseDRUGA single IV infusion infusion of BION-1301 at doses ranging from 10 to 1350 mg, administered once
Placebo Single DoseDRUGA single IV infusion of placebo
BION-1301 Multiple DosesDRUGPart 2: Multiple IV infusions of BION 1301 administered every 2 weeks (Q2W) at doses of 50 mg, 150 mg or 450 mg for up to 3 doses. Part 3: Repeated dosing of BION 1301: 450 mg IV Q2W for ≥24 weeks followed by 600 mg SC Q2W, or 600 mg SC Q2W throughout.
Placebo Multiple DosesDRUGMultiple IV infusions of placebo administered every 2 weeks for up to 3 doses
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo

Inclusion Criteria: * Aged ≥ 18 years at the time of signing the informed consent, prior to initiation of any study specific activities/procedures * Biopsy-proven IgAN diagnosed within the past 10 years prior to Screening, that, in the opinion of the Investigator, is not due to secondary causes. If...

Countries:United StatesArgentinaAustraliaCanadaMalaysiaMexicoSouth KoreaSpainTaiwanBelgiumBrazilChinaCroatiaCzechiaFranceGermanyGreeceIndiaIsraelItalyJapanTurkey (Türkiye)United KingdomPoland
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Recent Changes (Last 90 Days)

LOWOct 21, 2026NCT07146906lastUpdatePostDate: changed
LOWOct 21, 2026NCT07146906lastUpdatePostDate: changed
LOWOct 21, 2026NCT07146906lastUpdatePostDate: changed
LOWSep 30, 2026NCT07850752NEW_TRIAL: changed
LOWSep 30, 2026NCT07850752NEW_TRIAL: changed
LOWAug 17, 2026NCT06858319lastUpdatePostDate: changed
LOWAug 17, 2026NCT06858319lastUpdatePostDate: changed
LOWAug 11, 2026NCT07146906lastUpdatePostDate: changed
LOWAug 11, 2026NCT07146906lastUpdatePostDate: changed
LOWAug 11, 2026NCT07146906lastUpdatePostDate: changed

Frequently asked questions about Zigakibart

What is Zigakibart used for?

Zigakibart is being developed for the treatment of IgA nephropathy, also called immunoglobulin A nephropathy or IgAN, a chronic kidney disease. It is also being studied in broader kidney disease and glomerulonephritis populations. It is an investigational therapy and has not been approved for any indication.

Who is developing Zigakibart?

Zigakibart is being developed by Novartis AG, which trades under the ticker NVS. Novartis is running the clinical development program for the drug across multiple Phase 2 and Phase 3 studies in IgA nephropathy and related kidney diseases.

What phase is Zigakibart in?

Zigakibart is in Phase 3 clinical development. Its program includes Phase 3 trials such as NCT05852938, NCT06858319, and NCT07850752, along with a Phase 2 study, NCT07146906. It remains investigational and has not received FDA approval.

What clinical trials is Zigakibart in?

Zigakibart is being studied in four registered trials. These include the Phase 3 study NCT05852938 in adults with IgA nephropathy, the Phase 3 open-label extension NCT06858319, the Phase 3 combination study NCT07850752 with atrasentan, and the Phase 2 study NCT07146906.

Is Zigakibart the same as BION-1301?

Yes, Zigakibart is also known as BION-1301. BION-1301 was the earlier designation used for the same investigational compound, and it has also appeared as BION-1301 Single Dose in study listings. Both names refer to the same drug candidate being developed by Novartis for IgA nephropathy.

How many patients are enrolled in Zigakibart trials?

The Zigakibart clinical program has a total planned enrollment of 826 patients across its trials. Individual studies range from 32 patients in the Phase 2 trial NCT07146906 to 383 patients in the Phase 3 trial NCT05852938. All trials enroll adults aged 18 years and older.