Cited by 22Liver Diseases and ImmunityPeroxisome Proliferator-Activated ReceptorsDrug Transport and Resistance Mechanisms

Long-Term Efficacy and Safety of Selective PPARδ Agonist Seladelpar in Primary Biliary Cholangitis: ASSURE Interim Study Results

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Levy, Cynthia, Trivedi, Palak J., Kowdley, Kris V., Gordon, Stuart C., Bowlus, Christopher L., Londoño, Maria Carlota, Hirschfield, Gideon M., Gulamhusein, Aliya +14 more·2026·American Journal of Gastroenterology

Abstract

INTRODUCTION: The objective of these analyses was to evaluate interim data from the ongoing, open-label, long-term efficacy and safety ASSURE study of seladelpar, a selective peroxisome proliferator-activated receptor δ agonist, in primary biliary cholangitis. METHODS: Patients rolling over from the phase 3, randomized, placebo-controlled, 12-month RESPONSE study or with previous participation in earlier legacy seladelpar studies were enrolled. Interim evaluations included composite biochemical response (alkaline phosphatase <1.67 upper limit of normal, total bilirubin ≤ upper limit of normal, and alkaline phosphatase decrease ≥15%), pruritus numerical rating scale (NRS) change among patients with a baseline score ≥4, and safety. RESULTS: At interim cutoff, 337 patients were enrolled and received ≥1 seladelpar 10 mg dose: 54 placebo-treated and 104 seladelpar-treated from RESPONSE and 179 from legacy studies. The composite response rate at RESPONSE completion was 62% (79/128) with seladelpar and 20% (13/65) with placebo. After 12 months in ASSURE, among patients who rolled over from RESPONSE, response rates were 72% (21/29) in patients continuing seladelpar and 94% (15/16) in crossover seladelpar patients. In legacy trial patients, response rates were 73% (120/164) and 70% (69/99) after 12 and 24 months of treatment in ASSURE, respectively. The NRS decrease at RESPONSE completion in seladelpar-treated patients with baseline NRS ≥4 (−3.4) was maintained after 6 additional months of treatment (−3.8); changes were similar in crossover seladelpar (−3.8) and legacy patients (−3.5) after 6 months of treatment in ASSURE. No seladelpar-related serious adverse events were reported. DISCUSSION: Seladelpar demonstrated durable improvements in cholestatic biomarkers and pruritus in patients with primary biliary cholangitis with up to 2 years of treatment and remained overall safe with long-term use. Clinicaltrials.gov: NCT03301506.

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  • The side effects more commonly reported in the seladelpar study group were nausea, gastrointestinal discomfort, and mild headaches.

    “The side effects that were more commonly reported in the study group were nausea, gastrointestinal discomfort, and mild headaches [16,23,47].”

    From Second-Line Therapies in Primary Biliary Cholangitis: A Comparative Review of Obeticholic Acid, Fibrates, Seladelpar, and Elafibranor (2025) · cites this paper as [23]

    The Results > Safety section lists nausea, diarrhea, and upper abdominal pain among the most common adverse events, supporting the nausea and gastrointestinal-symptom portions of the claim. It does not list headaches or establish that these events were more common in the seladelpar group than in a comparator group; it also does not describe headaches as mild. Page numbers were not provided in our copy. (LLM, conf=0.86)

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  • In the ASSURE trial, among patients from the RESPONSE trial who continued seladelpar, at 12 months 38/53 patients (72%) sustained a composite biochemical response.

    “Among patients from the RESPONSE trial who continued seladelpar, at 12 months 38/53 patients (72%) sustained a composite biochemical response.”

    From Second-Line Therapies in Primary Biliary Cholangitis: A Comparative Review of Obeticholic Acid, Fibrates, Seladelpar, and Elafibranor (2025) · cites this paper as [23]

    The Results > Efficacy passage reports a 72% composite biochemical response among RESPONSE patients who continued seladelpar and completed 12 additional months in ASSURE. It gives 21/29 patients, not the claimed 38/53. (LLM, conf=0.90)

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  • In the ASSURE trial, in patients who had previously received seladelpar (n = 27), the mean decrease in pruritus NRS at month 18 was −3.5 to −3.8 points.

    “Regarding symptoms, in patients who had previously received seladelpar (n = 27), the mean decrease in pruritus NRS at month 18 was −3.5 to −3.8 points.”

    From Second-Line Therapies in Primary Biliary Cholangitis: A Comparative Review of Obeticholic Acid, Fibrates, Seladelpar, and Elafibranor (2025) · cites this paper as [23]

    The Results (Efficacy, Pruritus; page unavailable) report a −3.8-point mean NRS change after 18 months of treatment for 26 patients who continued seladelpar, not 27. The −3.5-point change is reported for a different, legacy group after six months of treatment in ASSURE, so it is not a range for the previously treated group at month 18. (LLM, conf=0.90)

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  • In the ASSURE trial, for ALP normalization, in the seladelpar continuation group, 9/53 (17%) achieved normalization at month 12 and in the crossover cohort, 27/54 (50%) achieved normalization at month 12.

    “For ALP normalization, in the seladelpar continuation group, 9/53 (17%) achieved normalization at month 12 and in the crossover cohort, 27/54 (50%) achieved normalization at month 12.”

    From Second-Line Therapies in Primary Biliary Cholangitis: A Comparative Review of Obeticholic Acid, Fibrates, Seladelpar, and Elafibranor (2025) · cites this paper as [23]

    The Results > Efficacy passage reports the claimed month-12 ALP normalization rates of 17% for the continuous seladelpar group and 50% for the crossover group. The counts do not match: the paper reports 5/29 and 8/16, not 9/53 and 27/54. (LLM, conf=0.90)

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  • In the ASSURE trial, at 24 months, across the broader population that included both RESPONSE trial and legacy phase 2 patients (n ≈ 145), composite biochemical response rates were sustained in 70-73%, while ALP normalization increased further to 42% (n ≈ 61/145).

    “At 24 months, across the broader population that included both RESPONSE trial and legacy phase 2 patients (n ≈ 145), composite biochemical response rates were sustained in 70–73%, while ALP normalization increased further to 42% (n ≈ 61/145).”

    From Second-Line Therapies in Primary Biliary Cholangitis: A Comparative Review of Obeticholic Acid, Fibrates, Seladelpar, and Elafibranor (2025) · cites this paper as [23]

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Research works printed but not linked: 1

  1. [11]IQIRVO (elafibranor). Prescribing Information. Ipsen Pharmaceuticals: Cambridge, Massachusetts, 2024. Accessed July 13, 2024. https://d2rkmuse97gwnh.cloudfront.net/a88aa6d6-3ca0-4362-a711-d53c45ae33ff/c91c4c2d-fbd6-4dec-99db-66768cdb2b5c/c91c4c2d-fbd6-4dec-99db-66768cdb2b5c_source__v.pdf

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Authors
Levy, C., Trivedi, P. J., Kowdley, K. V., Gordon, S. C., Bowlus, C. L., Londoño, M. C., Hirschfield, G. M., Gulamhusein, A., Lawitz, E. J., Vierling, J. M., Mayo, M. J., Jacobson, I. M., Kremer, A. E., Corpechot, C., Jones, D., Buggisch, P., Zhuo, S., Proehl, S., Heusner, C., McWherter, C. A., Crittenden, D. B., & on behalf of the ASSURE Investigators
Affiliations
  • University of Miami (US)
  • University Hospitals Birmingham NHS Foundation Trust (GB)
  • Liver Institute Northwest (US)
  • Henry Ford Hospital (US)
  • University of California Davis Medical Center (US)
  • Liver Unit, Hospital Clínic de Barcelona, Fundació de Recerca Clínic Barcelona-Institut d’Investigacions Biomèdiques August Pi i Sunyer, CIBEREHD, European Reference Network on Hepatological Diseases (ERN-LIVER), University of Barcelona, Barcelona, Spain;
  • Toronto General Hospital (CA)
  • The University of Texas at San Antonio Health Science Center (US)
  • Baylor College of Medicine (US)
  • The University of Texas Southwestern Medical Center (US)
  • NYU Langone Health (US)
  • University of Zurich (CH)
  • Sorbonne Université (FR)
  • Newcastle upon Tyne Hospitals NHS Foundation Trust (GB)
  • Liver Centre Hamburg at Ifi-Institute, Hamburg, Germany;
  • CymaBay Therapeutics (United States) (US)
  • Gilead Sciences (United States) (US)
Corresponding author
  • McWherter, Charles A.
  • Crittenden, Daria B.
Venue
American Journal of Gastroenterology
Published
2025-06-24
Volume
121
Issue
5
Pages
1140-1153
ISSN
  • 0002-9270 (ISSN-L)
  • 1572-0241
OpenAlex
W4411582238
Cited by
20
References
28
Citations by year
2026: 17 · 2025: 3
FWCI
11.24
Type
journal article
Language
en
Open access
Locations
  • The American Journal of Gastroenterology (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion, cc-by-nc-nd)
  • Zurich Open Repository and Archive (University of Zurich)
Funders
Gilead Sciences
Topics
  • Health Sciences › Medicine › Hepatology › Liver Diseases and Immunity
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
Keywords
seladelpar, primary biliary cirrhosis, PPARδ agonist, ASSURE trial, long-term efficacy, pruritus, alkaline phosphatase, total bilirubin, drug safety, open-label extension, durable response, bile duct diseases, cholestatic liver disease, drug repurposing

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