– Rademikibart demonstrated rapid and significant improvement in lung function and asthma control in patients, with greatest improvements observed in those with elevated baseline levels of key type 2 inflammatory markers –
– Significant reduction in annualized exacerbations observed in patients with one or more elevated type 2 inflammatory markers at baseline –
– Data supports ongoing Phase 2 Seabreeze STAT studies for acute exacerbations in asthma and COPD; expect to report topline data from both studies in 1H26 –
Sept. 29, 2025 -- Connect Biopharma Holdings Limited (Nasdaq: CNTB) (Connect Biopharma, Connect or the Company), a clinical-stage biopharmaceutical company focused on transforming care for the treatment of inflammatory diseases, today presented data supporting rademikibart, the Company’s investigational, next-generation, potentially best-in-class anti-interleukin-4-receptor alpha (IL-4Rα) antibody, at the European Respiratory Society (ERS) Congress 2025, taking place September 27 – October 1, 2025, in Amsterdam, Netherlands and virtually.
“We are excited to share additional analyses from our Phase 2b asthma study at ERS. These data continue to expand our data package for rademikibart and reinforce its potential to deliver best-in-class efficacy for patients with moderate to severe asthma and COPD,” said Barry Quart, Pharm.D., CEO and Director of Connect Biopharma. “These data build on previously reported Phase 2b study outcomes demonstrating rapid and sustained lung function improvements, with the greatest outcomes being observed in patients with elevated levels of key type 2 inflammatory biomarkers. In addition, these analyses have helped to refine our clinical development plans and clinical site strategies for our ongoing Seabreeze STAT asthma and COPD studies. We look forward to reporting topline data from both in the first half of 2026.”
Results from the Company’s Phase 2b trial of rademikibart in moderate-to-severe asthma were evaluated in a post-hoc analysis to investigate the efficacy of rademikibart in subgroups of patients with asthma based on baseline levels of type 2 inflammatory biomarkers, indicated by blood eosinophil counts (EOS) of
Rademikibart treatment led to rapid and sustained improvement in lung function and asthma control in subgroups with elevated baseline markers of Type 2 inflammation, with greatest improvements observed in patients with both high EOS and high FeNO.
At Week 24, treatment with rademikibart improved prebronchodilator FEV1 by 507 mL in patients with high EOS and high FeNO, 284 mL in patients with low EOS and high FeNO, 209 mL in patients with high EOS and low FeNO, and 108 mL in patients with low EOS and low FeNO.
In addition to lung function and asthma control, a reduction in asthma exacerbations was observed in subgroups with at least one high type 2 inflammatory biomarker at baseline, with a 63% reduction in patients with high EOS and a 69% reduction in patients with high FeNO.
These results highlight rademikibart’s potential to improve lung function and reduce asthma exacerbations, particularly in patients with elevated markers of Type 2 inflammation.
A post-hoc analysis of the Company’s Phase 2b trial of rademikibart in moderate-to-severe asthma investigated the prespecified primary endpoint, absolute change in prebronchodilator FEV1 at Week 12, in subgroups of patients enrolled in Poland and in the Rest of the World (ROW).
Rademikibart rapidly and significantly improved lung function in adults with asthma, with greater benefit observed in patients with higher baseline EOS, in both the overall trial population and ROW subgroup.
In Poland, placebo response was greater and rademikibart response was less than in the ROW subgroup and overall trial population. Four patients in the placebo group demonstrated unusually large improvements in lung function, potentially related to baseline factors, such as EOS 1, and/or daily use of inhalers.
In Poland, rademikibart-treated patients also had milder disease compared to the ROW subgroup, increased percent predicted FEV1, and despite similar FeNO levels, this baseline imbalance may have impacted treatment effects.
These results underscore the importance of rigorous trial conduct and comprehensive patient guidance and have informed the Company’s ongoing Phase 2 Seabreeze STAT clinical site strategy.
Rademikibart is a fully human monoclonal antibody targeting interleukin-4 receptor alpha (IL-4Rα), a common subunit of interleukin-4 receptor (IL-4) and interleukin-13 receptor (IL-13). We believe that by binding with IL-4Rα, rademikibart can block the functions of IL-4 and IL-13 effectively, thereby blocking the T helper 2 (Th2) inflammatory pathway to achieving the goal of treating Th2 related inflammatory diseases such as atopic dermatitis and asthma.
Connect Biopharma is a clinical-stage biopharmaceutical company dedicated to transforming care for asthma and COPD. Headquartered in San Diego, California, the Company is advancing rademikibart, a next-generation, potentially best-in-class antibody designed to target IL-4Rα. The Company is currently conducting global clinical studies of rademikibart for the treatment of acute exacerbations of asthma and COPD, areas with significant unmet need. Connect also has an exclusive license and collaboration agreement for rademikibart with Simcere in China.
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