sNDA submission based on results from Phase 3 DUPLEX and Phase 2 DUET studies of FILSPARI in FSGS
If approved, FILSPARI could become the first and only FDA-approved treatment for FSGS, a rare kidney condition and a leading cause of kidney failure
Additionally, the FDA notified the Company that REMS monitoring for embryo-fetal toxicity is no longer necessary; the Company plans to submit an amendment to the REMS sNDA currently under review for modification of liver monitoring
SAN DIEGO, March 17, 2025 (GLOBE NEWSWIRE) -- Travere Therapeutics, Inc., (Nasdaq: TVTX) today announced the Company has submitted a supplemental New Drug Application (sNDA) to the U.S. Food and Drug Administration (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.
About FSGS
Focal segmental glomerulosclerosis (FSGS) is a rare proteinuric kidney disorder in both children and adults that is estimated to affect more than 40,000 patients in the U.S. with similar prevalence in Europe. The disorder is defined by progressive scarring of the kidney and often leads to kidney failure. FSGS is characterized by proteinuria, where protein leaks into the urine due to a breakdown of the normal filtration mechanism in the kidney. Once in the urine, protein is considered to be toxic to other parts of the kidney, especially the tubules, and is believed to contribute to further disease progression. Other common symptoms include swelling in parts of the body, known as edema, as well as low blood albumin levels, abnormal lipid profiles and hypertension. There are currently no FDA-approved pharmacologic therapies for FSGS.
About the DUPLEX and DUET Studies
The Phase 3 DUPLEX Study is the largest interventional study to date in FSGS, and the only study in FSGS against a maximally dosed active comparator. While DUPLEX achieved its pre-specified interim FSGS partial remission of proteinuria (FPRE) endpoint with statistical significance at 36 weeks, it did not achieve the primary efficacy eGFR slope endpoint over 108 weeks of treatment. The two-year results from the study were published in the New England Journal of Medicine and showed that sparsentan delivered clinically meaningful benefit at 108 weeks with significant proteinuria reduction, higher rates of partial and complete remission, and a lower rate of end-stage kidney disease compared to the active control. The Phase 2 DUET Study of sparsentan in FSGS met the primary efficacy endpoint for the combined treatment group, demonstrating a greater than two-fold reduction in proteinuria compared to irbesartan. Sparsentan was well-tolerated with a safety profile that was consistent across all clinical trials conducted to date and comparable to the active control, irbesartan, including no drug-induced liver injury and no fluid overload. Patients who completed the DUPLEX and DUET double-blind portions of the studies on treatment were eligible to participate in the open-label extension of the trials.
About Travere Therapeutics
At Travere Therapeutics, we are in rare for life. We are a biopharmaceutical company that comes together every day to help patients, families and caregivers of all backgrounds as they navigate life with a rare disease. On this path, we know the need for treatment options is urgent – that is why our global team works with the rare disease community to identify, develop and deliver life-changing therapies. In pursuit of this mission, we continuously seek to understand the diverse perspectives of rare patients and to courageously forge new paths to make a difference in their lives and provide hope – today and tomorrow. For more information, visit travere.com
FILSPARI® (sparsentan) U.S. Indication
FILSPARI (sparsentan) is indicated to slow kidney function decline in adults with primary immunoglobulin A nephropathy (IgAN) who are at risk for disease progression.
IMPORTANT SAFETY INFORMATION
BOXED WARNING: HEPATOTOXICITY AND EMBRYO-FETAL TOXICITY
Because of the risks of hepatotoxicity and birth defects, FILSPARI is available only through a restricted program called the FILSPARI REMS. Under the FILSPARI REMS, prescribers, patients and pharmacies must enroll in the program.
Hepatotoxicity
Some Endothelin Receptor Antagonists (ERAs) have caused elevations of aminotransferases, hepatotoxicity, and liver failure. In clinical studies, elevations in aminotransferases (ALT or AST) of at least 3-times the Upper Limit of Normal (ULN) have been observed in up to 3.5% of FILSPARI-treated patients, including cases confirmed with rechallenge.
Measure transaminases and bilirubin before initiating treatment and monthly for the first 12 months, and then every 3 months during treatment. Interrupt treatment and closely monitor patients who develop aminotransferase elevations more than 3x ULN.
FILSPARI should generally be avoided in patients with elevated aminotransferases (>3x ULN) at baseline because monitoring for hepatotoxicity may be more difficult and these patients may be at increased risk for serious hepatotoxicity.
Embryo-Fetal Toxicity
FILSPARI can cause major birth defects if used by pregnant patients based on animal data. Therefore, pregnancy testing is required before the initiation of treatment, during treatment and one month after discontinuation of treatment with FILSPARI. Patients who can become pregnant must use effective contraception before the initiation of treatment, during treatment, and for one month after discontinuation of treatment with FILSPARI.
Contraindications
FILSPARI is contraindicated in patients who are pregnant. Do not coadminister FILSPARI with angiotensin receptor blockers (ARBs), ERAs, or aliskiren.
Warnings and Precautions
Advise patients with symptoms suggesting hepatotoxicity (nausea, vomiting, right upper quadrant pain, fatigue, anorexia, jaundice, dark urine, fever, or itching) to immediately stop treatment with FILSPARI and seek medical attention. If aminotransferase levels are abnormal at any time during treatment, interrupt FILSPARI and monitor as recommended.
Consider re-initiation of FILSPARI only when hepatic enzyme levels and bilirubin return to pretreatment values and only in patients who have not experienced clinical symptoms of hepatotoxicity. Avoid initiation of FILSPARI in patients with elevated aminotransferases (>3x ULN) prior to drug initiation because monitoring hepatotoxicity in these patients may be more difficult and these patients may be at increased risk for serious hepatotoxicity.
Most common adverse reactions
The most common adverse reactions (≥5%) are hyperkalemia, hypotension (including orthostatic hypotension), peripheral edema, dizziness, anemia, and acute kidney injury.
Drug interactions
Please see the full Prescribing Information, including BOXED WARNING, for additional Important Safety Information.
Forward Looking Statements
This press release contains “forward-looking statements” as that term is defined in the Private Securities Litigation Reform Act of 1995. Without limiting the foregoing, these statements are often identified by the words “on-track,” “positioned,” “look forward to,” “will,” “would,” “may,” “might,” “believes,” “anticipates,” “plans,” “expects,” “intends,” “potential,” or similar expressions. In addition, expressions of strategies, intentions or plans are also forward-looking statements. Such forward-looking statements include, but are not limited to, references to: statements and expectations regarding the Company’s sNDA for FILSPARI in FSGS, including expectations regarding the timing and outcome thereof, the potential for the FDA to accept the filing and grant priority review, and related matters; statements regarding the potential for FILSPARI to become the first and only FDA-approved medicine indicated for FSGS; statements and expectations regarding potential changes to the REMS, including the Company’s plans to submit an amendment to the REMS sNDA currently under review for potential modification of liver monitoring and the expected timing and outcome thereof; and references to the estimated size of the patient population. Such forward-looking statements are based on current expectations and involve inherent risks and uncertainties, including factors that could delay, divert or change any of them, and could cause actual outcomes and results to differ materially from current expectations. No forward-looking statement can be guaranteed. Among the factors that could cause actual results to differ materially from those indicated in the forward-looking statements are risks and uncertainties related to the Company’s sNDA for FILSPARI in FSGS, including the timing and outcome thereof. There is no guarantee that the FDA will accept the sNDA for filing, grant priority review of the sNDA or grant approval of FILSPARI for FSGS on the anticipated timeline, or at all. The Company also faces risks and uncertainties related to the Company’s planned submission of an amendment to the REMS sNDA currently under review for potential modification of liver monitoring, and the anticipated timing and outcome thereof, risks related to its business and finances in general, the success of its commercial products, risks and uncertainties associated with its preclinical and clinical stage pipeline, risks and uncertainties associated with the regulatory review and approval process, risks and uncertainties associated with enrollment of clinical trials for rare diseases, and risks that ongoing or planned clinical trials may not succeed or may be delayed for safety, regulatory or other reasons. Specifically, the Company faces risks associated with the ongoing commercial launch of FILSPARI in IgAN, the timing and potential outcome of its and its partners’ clinical studies, market acceptance of its commercial products including efficacy, safety, price, reimbursement, and benefit over competing therapies, risks related to the challenges of manufacturing scale-up, risks associated with the successful development and execution of commercial strategies for such products, including FILSPARI, and risks and uncertainties related to the new administration and matters related to the funding and staffing of government agencies including the FDA. The Company also faces the risk that it will be unable to raise additional funding that may be required to complete development of any or all of its product candidates, including as a result of macroeconomic conditions; risks relating to the Company’s dependence on contractors for clinical drug supply and commercial manufacturing; uncertainties relating to patent protection and exclusivity periods and intellectual property rights of third parties; risks associated with regulatory interactions; and risks and uncertainties relating to competitive products, including current and potential future generic competition with certain of the Company’s products, and technological changes that may limit demand for the Company’s products. The Company also faces additional risks associated with global and macroeconomic conditions, including health epidemics and pandemics, including risks related to potential disruptions to clinical trials, commercialization activity, supply chain, and manufacturing operations. You are cautioned not to place undue reliance on these forward-looking statements as there are important factors that could cause actual results to differ materially from those in forward-looking statements, many of which are beyond our control. The Company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events, or otherwise. Investors are referred to the full discussion of risks and uncertainties, including under the heading “Risk Factors”, as included in the Company’s most recent Form 10-K, Form 10-Q and other filings with the Securities and Exchange Commission.
Contact Info
Media: 888-969-7879 mediarelations@travere.com |
Investors: 888-969-7879 IR@travere.com |
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