Vertex Presents Updated Phase 1/2 Data From RUBY-3 Study That Continue to Demonstrate Best-in-Class Potential for Povetacicept in Adults with IgA Nephropathy and Primary Membranous Nephropathy at American Society of Nephrology Kidney Week

- 48-week data show a 64% decrease from baseline in proteinuria in IgA nephropathy, 82% decrease from baseline in proteinuria in primary membranous nephropathy, and stabilization of estimated glomerular filtration rate across both diseases -

- Vertex on track to initiate rolling submission of Biologics License Application for potential accelerated approval to the U.S. Food and Drug Administration this year; full enrollment completed for Phase 3 RAINIER trial in IgA nephropathy -

- Povetacicept in primary membranous nephropathy granted Fast Track Designation by the U.S. Food and Drug Administration and Phase 2/3 pivotal trial initiated -

BOSTON, November 08, 2025--(BUSINESS WIRE)--Vertex Pharmaceuticals Incorporated (Nasdaq: VRTX) today announced updated data for povetacicept (pove) in IgA nephropathy (IgAN) and primary membranous nephropathy (pMN) from the ongoing RUBY-3 trial at the American Society of Nephrology (ASN) Kidney Week 2025 in Houston, Texas. Pove is an investigational recombinant fusion protein therapeutic and dual inhibitor of the BAFF (B cell activating factor) and APRIL (a proliferation inducing ligand) cytokines. Pove is the only BAFF+APRIL inhibitor in pivotal trials for multiple kidney diseases.

Results were presented today as a late-breaking oral presentation (SA-OR091) and included interim data from the open-label Phase 1/2 RUBY-3 trial, where adults with IgAN and pMN received pove subcutaneously every 4 weeks. The analysis included 21 participants with IgAN and 10 participants with pMN treated with pove at the 80mg dose, of which 17 participants and 5 participants, respectively, completed the Week 48 study visit.

Results in IgAN

In IgAN, key efficacy findings for the pove 80mg cohort at 48 weeks showed a 64% decrease from baseline in mean 24-hour urine protein to creatinine ratio (UPCR), estimated glomerular filtration rate (eGFR) stabilization with change from baseline in eGFR (mean±SE) of 3.3±3.1 mL/min/1.73m2, 90% (9/10) of participants achieving hematuria resolution (defined as a decrease to negative or small levels of urine blood in participants with baseline levels of urine blood of moderate or large), and 53% of participants achieving clinical remission (defined as UPCR