Travere Therapeutics, Inc. announced the company has submitted a supplemental New Drug Application (sNDA) to the FDA seeking priority review for traditional approval of FILSPARI® (sparsentan) for the treatment of focal segmental glomerulosclerosis (FSGS). The submission is supported by results from the Phase 3 DUPLEX Study and the Phase 2 DUET Study, two of the largest head-to-head interventional studies conducted to date in adult and pediatric patients with FSGS.
“There is a profound and urgent need for effective treatment options that can target glomerular injury, reduce proteinuria, and preserve kidney function in FSGS,” said Eric Dube, Ph.D., president and chief executive officer of Travere Therapeutics. “Since its approval in IgA nephropathy, we have seen the positive impact FILSPARI can have on patients living with rare kidney disease. We have great hope to potentially bring FILSPARI as the first approved treatment for patients with FSGS and this sNDA submission is an important next step toward that goal. We look forward to the upcoming review process.”
FILSPARI is a non-immunosuppressive, oral medication that directly targets podocyte injury by selectively blocking the endothelin A receptor (ETAR) and the angiotensin II subtype 1 receptor (AT1R). It is currently approved to slow kidney function decline in adults with IgA nephropathy, a leading cause of kidney failure. The DUPLEX and DUET studies demonstrated that FILSPARI provided rapid, superior and sustained reductions in proteinuria when compared with maximum labeled dose irbesartan, in children and adults with FSGS. In the DUPLEX and DUET studies, FILSPARI was well-tolerated with a safety profile that was consistent across all clinical trials conducted to date.
The FDA has 60 days from the receipt of the application to determine whether to accept it for review. The Company expects to receive notice regarding the acceptance for review of the sNDA submission as well as the timeline for sNDA review from the FDA in the second quarter of 2025.
Additionally, the FDA recently notified the Company that the REMS is no longer necessary to ensure the benefits of FILSPARI outweigh the risk of embryo-fetal toxicity and to minimize the burden on the healthcare delivery system. The Company plans to submit a REMS modification to remove the need to monitor the risk of embryo-fetal toxicity as an amendment to the REMS sNDA currently under review for potential modification of liver monitoring. The FDA indicated that this amendment is not expected to impact the review timeline and the Company continues to expect a REMS modification PDUFA target action date of August 28, 2025.
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