Robert Brenner
Analyst · Evercore ISI
Thank you, Marshall. Having spent the past few years working to advance atacicept through clinical development and U.S. regulatory approval, it is deeply rewarding to now see TRUTAKNA reaching patients. I want to recognize our colleagues across the organization for the strong start to the product launch and their commitment to helping patients access treatment. Vera is advancing the ongoing clinical development program with the objective to bring atacicept to more patients and broaden its potential across autoimmune kidney diseases. That work begins with pursuing full approval in adults with primary IgA nephropathy at risk for disease progression, supported by the ORIGIN 3 final efficacy results. Two weeks ago, Dr. Jonathan Barratt presented the ORIGIN 3 final efficacy analysis as a late-breaking oral presentation in the opening plenary session of ASN Kidney Week with simultaneous publication in the New England Journal of Medicine. ORIGIN 3 randomized and dosed 428 adults with IgA nephropathy, and the final efficacy analysis met all prespecified endpoints. On the key secondary endpoint, the placebo-adjusted eGFR change from baseline at 52 weeks was 5.6 mL per minute. eGFR was minus 0.1 mL per minute with TRUTAKNA compared with minus 5.7 with placebo on top of background therapy. Through 104 weeks, the placebo-adjusted annualized eGFR slope was 5.0 mL per minute per year with minus 0.6 with TRUTAKNA versus minus 5.6 with placebo. The eGFR benefit observed with TRUTAKNA was preserved across all prespecified subgroups. These data demonstrate that patients treated with TRUTAKNA lose kidney function at a physiologic rate of approximately minus 1 mL per minute per year, while patients on placebo and background therapy continue to lose eGFR at a pathologic rate and a high probability of developing kidney failure during their lifetime. TRUTAKNA also reduced the risk of the composite kidney disease progression endpoint by 76% compared with placebo through 104 weeks with a hazard ratio of 0.24, 11 patients on TRUTAKNA, or 5%, had a sustained decline in eGFR of 30% or more, compared with 38 patients, or 18%, on placebo. Zero patients on TRUTAKNA progressed to dialysis, kidney transplantation, or death compared with 7 patients on placebo. At 52 weeks, the placebo-adjusted reduction in UPCR was 51%, and in galactose-deficient IgA1 was 67%, and hematuria resolved in 81% of TRUTAKNA-treated patients who had hematuria at baseline. And at 104 weeks, the placebo-adjusted reduction in UPCR was 60%, and hematuria resolved in 97% of TRUTAKNA-treated patients who had hematuria at baseline. In the ORIGIN 3 final efficacy analysis, TRUTAKNA was well tolerated with a safety profile generally comparable to placebo. Overall adverse events occurred in 75% of patients on TRUTAKNA versus 78% on placebo. Serious adverse events occurred in 7% of patients on TRUTAKNA versus 15% on placebo, and adverse events leading to discontinuation occurred in 2% versus 10%, respectively. The most common adverse events associated with TRUTAKNA and placebo, respectively, were infections 51% versus 52%, and local administration reactions 30% versus 8% (sic) [ 5% ]. Infection rates were similar between the 2 arms. There were no opportunistic infections or clinically relevant hypogammaglobulinemia, and no deaths occurred in the TRUTAKNA group. In the final efficacy analysis, 93% of TRUTAKNA-treated patients remained on therapy compared with 79% on placebo. These results form the basis of the recently submitted sBLA seeking full approval of TRUTAKNA in adults with primary IgA nephropathy, which is anticipated in mid-2027. ORIGIN 3 placebo participants are transitioning to open-label TRUTAKNA for the remainder of the trial. We reiterate our gratitude to the patients, investigators, employees, and collaborators who helped make this trial possible. Next, I'll turn to PIONEER, a Phase II basket trial evaluating atacicept in broader IgA nephropathy populations and in other antibody-mediated kidney diseases. At ASN Kidney Week, Dr. Richard Lafayette presented interim results from the adult IgA nephropathy and primary membranous nephropathy cohorts as a late-breaking oral presentation. At the time of this interim analysis, the IgA nephropathy cohorts enrolled 101 adults with baseline characteristics distinct from what is studied in Phase III IgA nephropathy trials, including patients with eGFR as low as 20 mL per minute, patients with proteinuria below 1 gram, patients with IgA vasculitis with nephritis, and patients with recurrent IgA nephropathy after kidney transplantation. In these populations, atacicept reduced proteinuria by 52% from baseline at week 24, similar to the results from ORIGIN 3. Reductions were consistent across cohorts with low baseline eGFR, low baseline proteinuria, and IgA vasculitis with nephritis. At the time of this interim analysis, the primary membranous nephropathy cohort had enrolled 16 adults with anti-PLA2R-positive disease, most of whom had nephrotic-range proteinuria. Reductions in anti-PLA2R antibody levels were detectable as early as week 4, and proteinuria declined over the first 12 weeks of treatment. These early data are consistent with what we would expect from a mechanism that acts upstream of autoantibody production. In this interim analysis of PIONEER, the safety profile was consistent with the broader atacicept experience, with no adverse events leading to discontinuation and no opportunistic infections. We believe these results support continued investigation of atacicept in antibody-mediated glomerular diseases. Finally, in a separate poster, we outlined the PIONEER investigation of pediatric patients with IgA nephropathy. The trial is currently enrolling children aged 10 and older, and we expect to open enrollment to children aged 2 to 10 in the future. We will also be reviewing data from the ongoing monthly dose range finding study of atacicept later this quarter. Our goal is to build on the evidence in adult IgA nephropathy while pursuing the most promising opportunities to bring this important therapy to additional patient populations. I'll now turn the call over to Matt Skelton to discuss our commercial progress. Matt?