ASN's Mission

ASN leads the fight to prevent, treat, and cure kidney diseases throughout the world by educating health professionals and scientists, advancing research and innovation, communicating new knowledge, and advocating for the highest quality care for patients.

learn more

Contact ASN

1401 H St, NW, Ste 900, Washington, DC 20005

email@asn-online.org

202-640-4660

The Latest on Twitter

Kidney Week

Abstract: SU-OR39

LNP023: A Novel Oral Complement Alternative Pathway Factor B Inhibitor Safely and Effectively Reduces Proteinuria in C3 Glomerulopathy

Session Information

Category: Glomerular Diseases

  • 1203 Glomerular Diseases: Clinical, Outcomes, and Trials

Authors

  • Wong, Edwin Kwan Soon, Royal Victoria Infirmary, Newcastle upon Tyne, Newcastle upon Tyne, United Kingdom
  • Praga, Manuel, Hospital 12 de Octubre, Madrid, Spain
  • Nester, Carla Marie, The University of Iowa Stead Family Children's Hospital, Iowa City, Iowa, United States
  • Daina, Erica, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Bergamo, Italy
  • Remuzzi, Giuseppe, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Bergamo, Italy
  • Nidamarthy, Prasanna Kumar, Novartis AG, Basel, Basel-Stadt, Switzerland
  • End, Peter R C, Novartis AG, Basel, Basel-Stadt, Switzerland
  • Milojevic, Julie M., Novartis AG, Basel, Basel-Stadt, Switzerland
  • Biondani, Andrea, Novartis AG, Basel, Basel-Stadt, Switzerland
  • Trapani, Angelo J., Novartis AG, Basel, Basel-Stadt, Switzerland
  • Webb, Nicholas, Novartis AG, Basel, Basel-Stadt, Switzerland
  • Junge, Dr Guido, Novartis AG, Basel, Basel-Stadt, Switzerland
Background

LNP023 is a highly selective oral low molecular weight inhibitor of complement Factor B, a key alternative pathway (AP) protease. The aim of the preliminary interim analysis (IA) of this Phase 2 study (NCT03832114) was to determine whether LNP023 safely and effectively reduces proteinuria in patients with C3 glomerulopathy (C3G).

Methods

Adults with biopsy-proven native C3G received open-label LNP023 for 12w (10-100mg bid during w1-3 then 200mg bid w4-12). All had proteinuria >1g/24h, low plasma C3, stable ACEi/ARB and were vaccinated vs. encapsulated bacteria. Complement inhibition was measured by the ex vivo Wieslab assay and fragment Bb and soluble C5b-9 (sC5b-9) levels. Study primary end-point was the ratio of UPCR at 12w vs. baseline. On study completion, all patients received ongoing LNP023 in a long-term extension study (NCT03955445).

Results

7 patients completed therapy at the time of this IA: mean (range) age 25 (18-39)y, median (range) eGFR 80 (29-130)ml/min/1.73m2. There were no treatment discontinuations. UPCR levels fell by 53% (80% CI 40-64%) from a Geo-Mean (Geo-CV%) value of 399 (67.6)mg/mmol at baseline to 187 (104.3)mg/mmol at 12w, p=0.0035. eGFR improved or stabilised; median (IQR) change +4.0 ml/min/1.73m2 (-0.5 - +7.5ml/min/1.73m2). There were no deaths or treatment-emergent SAEs. Blood and urine complement biomarkers confirmed abnormal pre-dosing AP activity in all. Plasma C3 levels recovered, with complete normalisation in 5/7 at 12w. LNP023 inhibited AP activity, with maximal effects obtained at 100mg to 200mg bid (median percent changes from BL at maximum inhibition were Wieslab: -66.3% (N=5), plasma Bb: -13.6% (N=5), plasma SC5b-9 (N=6): -75.9%, urine SC5b-9: -94.9% (N=4)). There was little impact of reduced eGFR on LNP023 systemic exposure. In 6 patients who have entered the long-term extension study to date there has been further reduction in proteinuria; Geo-CV% UPCR value at 6m was 129 (109.9)mg/mmol, a fall of 67.7% from baseline.

Conclusion

LNP023 200mg bid resulted in AP blockade and reduced proteinuria in patients with C3G treated for 12w with excellent safety and tolerability. Extended treatment resulted in further proteinuria reduction.

Funding

  • Commercial Support