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Zymfentra demonstrated long-term efficacy and safety profile of maintenance treatment for adults with moderately to severely active Crohn’s disease and ulcerative colitis – MedNews

JERSEY CITY, N.J., May 21, 2024. Celltrion USA announced today positive two-year results from the extended LIBERTY studies (LIBERTY-CD and LIBERTY-UC) for ZYMFENTRA (infliximab-dyyb) in adult patients with moderately to severely active Crohn’s disease (CD) and ulcerative colitis (UC) after induction with intravenous (IV) infliximab, further supporting the efficacy and safety seen in previous pivotal studies. The data was shared during 18 oral and poster presentations at the Digestive Disease Week® (DDW) 2024 Annual Meeting in Washington, D.C., from May 18 to 21.

The presentations included results of the two-year LIBERTY studies and a post-hoc analysis of the LIBERTY-CD study, which evaluated the impact of anti-drug antibodies (ADAs) on drug levels and efficacy in patients treated with ZYMFENTRA.

“Establishing the long-term efficacy and safety profile of ZYMFENTRA is an important step as we work to bring relief and remission to the millions of people worldwide living with Crohn’s disease and ulcerative colitis,” said Thomas Nusbickel, Chief Commercial Officer at Celltrion USA. “These studies reaffirm efficacy and tolerance of ZYMFENTRA as maintenance therapy and underscore Celltrion USA’s commitment to delivering different treatment options for patients in the gastroenterology space.”

Two-year extension phase of LIBERTY studies

The extension phase of the LIBERTY studies (LIBERTY-CD and LIBERTY-UC) was carried out over a duration of 102 weeks (including 10 weeks of infliximab IV induction), expanding upon the initial LIBERTY trials. These two-year studies evaluated the long-term efficacy and safety of infliximab SC in patients diagnosed with Crohn’s disease (CD) and ulcerative colitis (UC). In both LIBERTY-CD and UC studies, efficacy results, including but not limited to clinical remission, clinical response and corticosteroid-free remission, were generally well maintained at Week 102 compared to those of Week 54.

Post-hoc analysis of LIBERTY-CD study

A post-hoc analysis evaluated the impact of ADAs on clinical outcomes in patients with CD who received infliximab SC maintenance treatment. The analysis comprised 231 patients (ADA-positive: n=150; ADA-negative: n=81) who received infliximab SC as maintenance treatment. Notably, there were no statistically significant differences in clinical outcomes at Week 54 between ADA-positive and ADA-negative patients. Although mean trough serum infliximab concentrations at Week 54 were notably lower in the ADA-positive group than in the ADA-negative group (11.7 vs. 19.3 μg/mL; p<0.00001), both groups exceeded the historical therapeutic target concentration of 5 μg/mL, with comparable discontinuation rates observed between the groups.

“Results from the two-year extension phase LIBERTY studies, alongside post-hoc analysis, highlight important data supporting the efficacy and safety of ZYMFENTRA as a subcutaneous maintenance treatment option for people living with CD and UC,” said Hetal Patel, Senior Director, Medical Affairs at Celltrion USA. “The post-hoc analysis reveals that ADAs showed no significant impact on clinical outcomes or discontinuation rates. These findings could be explained by the relatively high trough serum infliximab concentrations achieved by ADA-positive patients.”[1],[2],[3]

PEREM long term study

In a large multi-center prospective cohort of inflammatory bowel diseases, the study assessed SC infliximab persistence, efficacy and tolerance after the switch from intravenous infliximab. The study enrolled 426 patients, with 72.4% diagnosed with Crohn’s disease (CD). At baseline, 74% of participants were receiving the standard IV infliximab dose (5 mg/kg every 8 weeks), with 16% receiving combination therapy with an immunosuppressant. Drug persistence with SC infliximab was notably high at 95.3% among patients with complete data up to Week 48 (95% confidence interval: 93.2-97.5)[4]

About Celltrion USA

Celltrion USA is Celltrion’s U.S. subsidiary established in 2018. Headquartered in New Jersey, Celltrion USA is committed to expanding access to innovative biologics to improve care for U.S. patients. Celltrion currently has five biosimilars approved by the U.S. FDA: INFLECTRA® (infliximab-dyyb), TRUXIMA® (rituximab-abbs), HERZUMA® (trastuzumab-pkrb), VEGZELMA® (bevacizumab-adcd) and YUFLYMA®(adalimumab-aaty) as well as a new biologic ZYMFENTRA™. Celltrion USA will continue to leverage Celltrion’s unique heritage in biotechnology, supply chain excellence and best-in-class sales capabilities to improve access to high-quality biopharmaceuticals for U.S. patients.

About Digestive Disease Week

Digestive Disease Week® (DDW) is the largest international gathering of physicians, researchers and academics in the fields of gastroenterology, hepatology, endoscopy and gastrointestinal surgery. Jointly sponsored by the American Association for the Study of Liver Diseases (AASLD), the American Gastroenterological Association (AGA), the American Society for Gastrointestinal Endoscopy (ASGE) and the Society for Surgery of the Alimentary Tract (SSAT), DDW is an in-person and online meeting from May 18-21, 2024. The meeting showcases more than 4,400 abstracts and hundreds of lectures on the latest advances in GI research, medicine and technology.


[1] Jean F. Colombel et al., Subcutaneous infliximab (CT-P13 SC) as maintenance therapy for Crohn’s disease: 2 years results of the LIBERTY-CD study. Poster (Su1762). Presented at DDW 2024.

[2] Bruce E. Sands et al., Subcutaneous infliximab (CT-P13 SC) for ulcerative colitis: 2-year extension results of the LIBERTY-UC study. Poster (Su1779). Presented at DDW 2024.

[3] Jean F. Colombel et al., Impact of immunogenicity on clinical outcomes in patients with Crohn’s disease receiving maintenance treatment with subcutaneous infliximab: A post hoc analysis of the LIBERTY-CD study. Poster (Su1765). Presented at DDW 2024.

[4] Nicolas Mathieu et al., Persistence, efficacy and tolerance of subcutaneous infliximab after switch from intravenous infliximab in IBD patients in remission: one-year results from a multicenter prospective cohort. Oral Presentation (1179). Presented at DDW 2024.

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