Noah Rosenberg
Analyst · Michelle Gilson with Canaccord Genuity
Thank you, Eric. We're entering an exciting period for the pivotal sparsentan programs, both the DUPLEX study in FSGS and the PROTECT study in IgA nephropathy continued to progress despite the challenging environment presented by the ongoing COVID-19 pandemic. Our clinical and operations teams are maintaining contact and actively collaborating with study sites, principal investigators and CRO partners. In doing so, we are reinforcing a focus on the key priorities we've used to navigate the ongoing pandemic. These include patient safety, ensuring continuous drug supply, preserving data integrity, and documentation in alignment with FDA and EMA guidance. We also continue to see a remarkable dedication for patients and their families as well as the investigators and site staff that make up the global clinical network supporting our programs. This has translated into continued progress in both pivotal studies of sparsentan. With regard to our Phase 3 DUPLEX study in FSGS, I am pleased to report that it continues to advance according to plan. As Eric mentioned, the prespecified sample size reassessment for the confirmatory eGFR portion of the trial has been completed. The process was overseen by the independent data monitoring committee, and we remain blinded to the study. Based upon the review of the results, the recommendation was no increase in sample size. The independent data mine committee also concurrently completed the fourth scheduled meeting to assess safety in both DUPLEX and PROTECT. I am pleased to report that the DMC recommended both studies proceed as planned based upon their safety review. We also continued our ongoing dialogue with FDA with the objective of ensuring that we are aligned on a path to generating a strong data package with DUPLEX that can support an accelerated approval filing if our top line results from the 36-week interim analysis are successful. Of note, we remain aligned with the FDA on the use of the 36-week FSGS partial emission of proteinuria endpoint, or FPRE, as a surrogate endpoint in pursuit of a potential accelerated approval as well as analyzing eGFR for confirmatory approval. The agency has requested and we are adopting a measurement of eGFR from baseline to week 108 instead of the original management from week 6 to week 108 as the confirmatory analysis. This measurement can be easily adopted and our 90% power in the study remains. Notably, the completed sample size reassessment that resulted in no increase in sample size included both of these eGFR measurements in its analysis. As a result, we are continuing, as originally planned, with total enrollment of approximately 300 patients with FSGS to support the confirmatory analysis in the study. We have seen an encouraging rate of activity in DUPLEX in recent months, and we are now anticipating completion of enrollment before year-end. We will continue to monitor for any changes related to the evolving COVID-19 pandemic. Based upon the current positive momentum in enrollment, as well as the clearance to proceed as planned with the current sample size, we have confidence in our ability to deliver top line results from the proteinuria endpoint in the first quarter of next year. As we approach this milestone, our teams will continue their parallel preparation for NDA and CMA submissions. Moving to IgA nephropathy. The pivotal PROTECT study of sparsentan in IgAN achieved enrollment of the 280th patient during the quarter. This is notable, as it now positions us to report top line data from the 36-week proteinuria analysis from the first 280 patients in the third quarter of next year, well ahead of our original schedule. If successful, the 36-week proteinuria analysis are accompanied by a strong data package from the first 280 patients is expected to support accelerated approval filings in the U.S. and Europe. I would like to recognize the efforts of our teams, partners, investigators and site staff as well as the ongoing dedication from patients and their families that have enabled us now to be in position for top line readouts from both pivotal studies in 2021. Listening to the nephrology community, there is strong enthusiasm for our programs, and we continue to believe that if our studies are successful and sparsentan is ultimately approved, it has the potential to become a new standard of care for people living with FSGS and IgA nephropathy. During the quarter, we also completed initial exploratory efforts around sparsentan in Alport syndrome. Following a thorough feasibility analysis of the clinical, regulatory and operational considerations, we will not be initiating a late-stage program in Alport at this time, but rather continue to focus our current development efforts for sparsentan on FSGS and IgAN. We recognize the unmet need that the Alport community faces and plan to explore potential alternative approaches. Overall, in the third quarter, we maintained solid execution and advanced our clinical programs. The sample size reassessment of DUPLEX was completed, and we now have clarity that the study will move forward according to our original plans and without adjustment to the number of patients enrolled. We had an additional regulatory interaction that confirmed our path for potential accelerated approval filing. We maintain momentum in DUPLEX such that we are nearing completion of enrollment, and we reached a key milestone of enrolling the 280th patient in PROTECT, which now puts us on track for a readout from the 36-week proteinuria analysis in the third quarter of next year. Let me now turn the call over to Peter for a commercial update. Peter?