SAFETY AND PRELIMINARY EFFICACY FINDINGS FROM A PHASE 2A RANDOMIZED, DOUBLE-BLIND, PLACEBO-CONTROLLED TRIAL OF SETANAXIB IN PATIENTS WITH ALPORT SYNDROME

 

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https://storage.unitedwebnetwork.com/files/1099/f4eb4314d287b2c50b16e1ca5ff8a3b5.pdf
SAFETY AND PRELIMINARY EFFICACY FINDINGS FROM A PHASE 2A RANDOMIZED, DOUBLE-BLIND, PLACEBO-CONTROLLED TRIAL OF SETANAXIB IN PATIENTS WITH ALPORT SYNDROME

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Daniel
Gale
Daniel Gale d.gale@ucl.ac.uk University College London Department of Renal Medicine London United Kingdom *
Irene Agraz Pamplona irene.agraz@vallhebron.cat Vall d'Hebron Institute of Research Vall d'Hebron Institute of Research Barcelona Spain -
Zainab Arslan Zainab.Arslan@gosh.nhs.uk Great Ormond Street Hospital for Children Department of Paediatric Nephrology London United Kingdom -
Rafael José Esteban de la Rosa rafaelj.esteban@gmail.com Hospital Universitario Virgen de las Nieves, and Instituto de Investigación Biosanitaria ibs.GRANADA Department of Nephrology Granada Spain -
Matthew Hall matthew.hall10@nhs.net Nottingham University Hospitals Nottingham Renal Unit Nottingham United Kingdom -
Karel Krejci Karel.Krejci@fnol.cz University Hospital and Faculty of Medicine Palacký University Olomouc 3rd Department of Internal Medicine – Nephrology, Rheumatology and Endocrinology Olomouc Czech Republic -
Enrique Morales emoralesr@senefro.org Hospital Universitario 12 de Octubre Department of Nephrology Madrid Spain -
Roman Safranek roman.safranek@fnhk.cz Charles University and University Hospital Hradec Kralove Medical Faculty Hradec Kralove Czech Republic -
Vladimir Tesar Vladimir.Tesar@vfn.cz General University Hospital, Charles University Department of Nephrology Prague Czech Republic -
Roser Torra rtorra@fundacio-puigvert.es Fundació Puigvert, Institut de Recerca Sant Pau (IR-Sant Pau), Departament de Medicina, Universitat Autònoma de Barcelona, RICORS2040 renal Nephrology Department Barcelona Spain -
Ondrej Viklicky onvi@ikem.cz Institute for Clinical and Experimental Medicine Department of Nephrology Prague Czech Republic -
Carl Stefan Carlsson stefan.carlsson@calliditas.com Calliditas Therapeutics AB Clinical Department Stockholm Sweden -
Aaron Levine aaron.levine@calliditas.com Calliditas Therapeutics AB Statistics Department Stockholm Sweden -
Rachel Lennon Rachel.Lennon@manchester.ac.uk Royal Manchester Children’s Hospital Department of Paediatric Nephrology Manchester United Kingdom -
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Alport syndrome is a rare genetic disease resulting from collagen IV abnormalities and is marked by interstitial fibrosis and declining kidney function. Fibrosis prevention may preserve kidney function. We report safety and preliminary efficacy findings with setanaxib, an enzyme-driven hydrogen peroxide-depleting agent with anti-fibrotic properties, in patients with Alport syndrome.

In this Phase 2a trial (NCT06274489), 20 patients (12–40 years) with genetically confirmed Alport syndrome, UPCR ≥0.8 g/g, eGFR ≥30 mL/min/1.73 m2 and at risk of disease progression despite background therapy were randomized 2:1 to receive oral setanaxib (800 mg BID [18–40 years]/800 + 400 mg/day [12–17 years]; n=13) or placebo (n=7) plus background therapy for 24 weeks. Primary endpoints were serious adverse events (SAEs) and AEs of special interest (AESIs); secondary endpoints included changes in UPCR and eGFR from baseline. After 24 weeks, patients were followed for 4 weeks on background therapy alone. Of the background therapies allowed, 16 patients were on ACEis (11 setanaxib, 5 placebo), 11 on SGLT2is (7 setanaxib, 4 placebo) and 10 on both (7 setanaxib, 3 placebo).

One randomized patient in the placebo group withdrew consent before treatment start. AEs occurred at similar frequencies in both treatment groups. Primary endpoints were met: 1 setanaxib group patient had an SAE of acute cholecystitis that was not deemed treatment related by the investigator, and no AESIs were reported. The setanaxib group had a 15% mean UPCR reduction at 24 weeks versus placebo. Two (15.4%) setanaxib group patients had a UPCR reduction of ≥25% from baseline at 24 weeks, versus none in the placebo group. An ad hoc analysis showed that 5 (38.5%) setanaxib group patients had a UPCR reduction of ≥10% versus baseline, compared with 1 (16.7%) placebo group patient. The setanaxib group also had a 27% mean UPCR reduction at 4 weeks post dosing versus placebo. There was a 5% mean reduction in eGFR with setanaxib versus placebo at 24 weeks and a 4% reduction at 4 weeks post dosing.

In patients with Alport syndrome, setanaxib plus background therapy had an acceptable safety profile with a trend towards UPCR reduction after 24 weeks of dosing and at 4 weeks post dosing versus background therapy alone.

This abstract was also submitted for the American Society of Nephrology Kidney Week 2025 congress.

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