Bimekizumab Demonstrated Sustained Clinical Responses to Week 52 in Phase 3 Studies in Psoriatic Arthritis, Non-Radiographic Axial Spondyloarthritis, and Ankylosing Spondylitis

• New late-breaking 52-week data from Phase 3 bimekizumab investigational studies in psoriatic arthritis and across the spectrum of axial spondyloarthritis, including non-radiographic axial spondyloarthritis and ankylosing spondylitis, presented at ACR Convergence 2022
• In BE OPTIMAL, clinical joint and skin clearance responses in psoriatic arthritis were sustained to week 52 with bimekizumab treatment
• In BE MOBILE 1 and BE MOBILE 2, treatment with bimekizumab resulted in sustained clinical responses to week 52, including suppression of inflammation and improvements in function and quality of life across the full spectrum of axial spondyloarthritis
• The adverse event profile of bimekizumab to week 52 in psoriatic arthritis, non-radiographic axial spondyloarthritis, and ankylosing spondylitis is consistent with previous observations with no new safety signals

BRUSSELS and ATLANTA, Nov. 10, 2022 /PRNewswire/ -- UCB, a global biopharmaceutical company, today announced the first presentation of long-term, 52-week data from three Phase 3 studies evaluating the efficacy and safety of bimekizumab in adults with active psoriatic arthritis (PsA) who were biologic-naïve (BE OPTIMAL), in adults with active non-radiographic axial spondyloarthritis (nr-axSpA; BE MOBILE 1), and in adults with active ankylosing spondylitis (AS; BE MOBILE 2).^1,2 These late-breaking data are being presented at ACR Convergence 2022 in Philadelphia, November 10–14, 2022.^1,2 Bimekizumab is an investigational product; its efficacy and safety have not been established for any indication in the U.S. and it is not approved by the U.S. Food and Drug Administration (FDA).

Data from BE OPTIMAL showed that clinical joint and skin clearance responses in patients with active psoriatic arthritis were sustained to week 52 with bimekizumab treatment.¹ In addition, data from BE MOBILE 1 and BE MOBILE 2 showed that across the full spectrum of axSpA, encompassing nr-axSpA and AS, treatment with bimekizumab resulted in sustained improvement in the signs and symptoms of disease, including suppression of inflammation and improvements in physical function and quality of life, to week 52.² These outcomes were consistent across both TNF-inhibitor (TNFi) naïve and TNFi-inadequate responder populations.² In all three studies, the adverse event profile of bimekizumab was consistent with data seen in previous studies with no new observed signals.^1,2

"The 52-week data shared today demonstrate the high thresholds of disease control that were achieved by the majority of patients across these three studies. The results build on the previously announced 24-week data and show that bimekizumab sustained a clinically meaningful impact for patients through one year," said Emmanuel Caeymaex, Executive Vice President, Immunology Solutions and Head of U.S., UCB.

In BE OPTIMAL, patients were randomized (3:2:1) to bimekizumab (160 mg every four weeks [Q4W]; n=431), placebo (n=281) or the active reference arm (adalimumab 40 mg every two weeks [Q2W]; n=140). Patients initially randomized to placebo were switched to bimekizumab at week 16. A total of 89.3 percent of randomized patients completed week 52. Key 52-week results from the BE OPTIMAL study are presented below and build upon previously announced 16- and 24-week results.

• ACR50: At week 52, 54.5 percent of patients continuously treated with bimekizumab, 53.0 percent of patients who switched from placebo to bimekizumab at week 16, and 50.0 percent of patients in the reference arm (adalimumab) achieved ACR50.
• Complete Skin Clearance (PASI 100): At week 52, in patients with baseline psoriasis ≥3 percent body surface area^¥, 60.8 percent of patients continuously treated with bimekizumab, 65.0 percent of patients who switched from placebo to bimekizumab at week 16, and 48.5 percent of patients in the reference arm (adalimumab) achieved PASI 100.
• Minimal Disease Activity (MDA): At week 52, 55.0 percent of patients continuously treated with bimekizumab, 53.7 percent of patients who switched from placebo to bimekizumab at week 16, and 52.9 percent of patients in the reference arm (adalimumab) achieved MDA.

"The long-term bimekizumab data presented at ACR Convergence 2022 in patients with psoriatic arthritis show clinically meaningful improvements in joint and skin outcomes through to one year. In BE OPTIMAL, at week 52, over six out of 10 patients treated with bimekizumab achieved complete skin clearance and one in two patients achieved minimal disease activity. Long-term data such as these are important since they may help to inform clinical decision making of the future," said Christopher Ritchlin MD, MPH, Professor of Medicine and faculty member in the Allergy, Immunology & Rheumatology Division, University of Rochester Medical School, Rochester, New York, U.S.

Over 52 weeks, 79.1 percent of patients treated with bimekizumab had ≥ one treatment emergent adverse event (TEAE) and 80.7 percent on adalimumab.¹ The three most frequent TEAEs with bimekizumab treatment were nasopharyngitis (12.0 percent), upper respiratory tract infection (7.1 percent), and urinary tract infection (6.1 percent).¹ 

In BE MOBILE 1 and BE MOBILE 2, patients were randomized to bimekizumab (160 mg Q4W; n=128 for BE MOBILE 1 and n=221 for BE MOBILE 2) or to placebo (n=126 for BE MOBILE 1 and n=111 for BE MOBILE 2). Patients initially randomized to placebo were switched to bimekizumab at week 16. A total of 86.6 percent randomized patients with nr-axSpA and 89.8 percent with AS completed week 52. Key 52-week results from the BE MOBILE 1 and BE MOBILE 2 studies are presented below and build upon previously announced 16- and 24-week results:

• ASAS40: At week 52, 60.9 percent of nr-axSpA patients and 58.4 percent of AS patients continuously treated with bimekizumab achieved ASAS40, with consistent outcomes across both TNFi-naïve and TNFi-inadequate responder populations.
• Low Disease Activity and Remission: At week 52, 61.6 percent of nr-axSpA patients and 57.1 percent of AS patients continuously treated with bimekizumab achieved low disease activity (ASDAS<2.1); at week 52, inactive disease or clinical remission (ASDAS<1.3) was achieved by 25.2 percent of nr-axSpA patients and 23.4 percent of AS patients continuously treated with bimekizumab.
• Objective Inflammation: The reductions from baseline in objective signs of inflammation (Magnetic Resonance Imaging [MRI], hs-C-Reactive Protein [hs-CRP]) for patients with nr-axSpA and AS were sustained through week 52.

In addition, improvements in function as measured by the Bath Ankylosing Spondylitis Functional Index (BASFI) and quality of life, as measured by Ankylosing Spondylitis Quality of Life (ASQoL), were sustained through week 52.

"Results presented today from BE MOBILE 1 and BE MOBILE 2 demonstrate that treatment with bimekizumab provided consistent and sustained improvements to one year in key signs and symptoms across the full spectrum of axial spondyloarthritis, with similar outcomes regardless of previous treatment with TNF inhibitors. These positive results are the first Phase 3 data evaluating a dual IL-17A and IL-17F inhibitor, bimekizumab, in the long-term treatment of patients living with non-radiographic axial spondyloarthritis and ankylosing spondylitis," said Professor Xenofon Baraliakos, Rheumazentrum Ruhrgebiet Herne, Ruhr-University Bochum, Germany.

Over 52 weeks, 75.0 percent of nr-axSpA patients treated with bimekizumab and 75.5 percent of AS patients had ≥1 TEAE.² The most frequent TEAEs were nasopharyngitis (nr-axSpA 12.3 percent; AS 9.1 percent), upper respiratory tract infection (nr-axSpA 9.4 percent; AS 6.4 percent) and oral candidiasis (nr-axSpA 7.4 percent; AS 6.1 percent); few COVID-19 infections were reported (nr-axSpA: 7.0 percent; AS; 2.1 percent).² The incidence of serious TEAEs was low (nr-axSpA 4.4 percent; AS 7.1 percent).²

Notes to editors:

The primary endpoint in the BE OPTIMAL study was ACR50 at week 16 with ranked secondary endpoints including PASI90 and MDA at week 16; the primary endpoint in the BE MOBILE 1 and BE MOBILE 2 studies was ASAS40 at week 16.

^¥In patients with psoriasis affecting ≥3% body surface area at baseline; n=217 for patients continuing treatment with bimekizumab; n=140 for patients switching from placebo to bimekizumab at week 16 and n=68 for patients continuing treatment with adalimumab

Psoriatic arthritis (PsA) is a serious, highly heterogeneous, chronic systemic inflammatory condition affecting both the joints and skin, with a prevalence of 0.02 percent to 0.25 percent of the population, and 6 percent to 41 percent of patients with psoriasis.³ Symptoms include joint pain and stiffness, skin plaques, swollen toes and fingers (dactylitis), and inflammation of the sites where tendons or ligaments insert into the bone (enthesitis).⁴

Axial Spondyloarthritis (axSpA), which includes both non-radiographic axSpA and ankylosing spondylitis (AS), is a chronic, immune-mediated, inflammatory disease.⁵ nr-axSpA is defined clinically by the absence of definitive x-ray evidence of structural damage to the sacroiliac joints.⁵ AxSpA is a painful condition that primarily affects the spine and the joints linking the pelvis and lower spine (sacroiliac joints).⁵ The leading symptom of axSpA in a majority of patients is inflammatory back pain that improves with exercise, but not with rest.⁵ Other common clinical features frequently include anterior uveitis, enthesitis, peripheral arthritis, psoriasis, inflammatory bowel disease and dactylitis.⁵ The overall prevalence of axSpA is 0.3 percent to 1.2 percent of adults.^6,7 Approximately half of all patients with axSpA are patients with nr-axSpA.⁵ AxSpA onset usually occurs before the age of 45.⁵ Approximately 10 to 40 percent of patients with nr-axSpA progress to ankylosing spondylitis over 2 to 10 years.⁵

Bimekizumab is a humanized monoclonal IgG1 antibody that is designed to selectively inhibit both interleukin 17A (IL-17A) and interleukin 17F (IL-17F), two key cytokines driving inflammatory processes.⁸ In August 2021, bimekizumab was approved in the European Union (EU)/European Economic Area (EEA) and in Great Britain, for the treatment of moderate-to-severe plaque psoriasis in adults who are candidates for systemic therapy.^9,10 The label information may differ in other countries. Please check local prescribing information. Bimekizumab is an investigational product; its efficacy and safety have not been established for any indication in the U.S. and it is not approved by the U.S. Food and Drug Administration (FDA).

For further information, contact UCB:

Investor Relations
Antje Witte
T +32.2.559.94.14
email [email protected] 

U.S. Immunology Communications
Nicole Herga
T +1.773.960.5349 
Email: [email protected] 

UCB, Brussels, Belgium (www.ucb.com) is a global biopharmaceutical company focused on the discovery and development of innovative medicines and solutions to transform the lives of people living with severe diseases of the immune system or of the central nervous system. With approximately 8,600 people in approximately 40 countries, the company generated revenue of €5.8 billion in 2021. UCB is listed on Euronext Brussels (symbol: UCB). Follow us on Twitter: @UCB_news.

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1. Ritchlin C, Coates L, McInnes I et al, Bimekizumab treatment in biologic DMARD-naïve patients with active psoriatic arthritis: 52-week efficacy and safety results from a Phase 3, randomized, placebo-controlled, active reference study. #L02 Presented at ACR Convergence 2022. https://acrabstracts.org/abstract/bimekizumab-treatment-in-biologic-dmard-naive-patients-with-active-psoriatic-arthritis-52-week-efficacy-and-safety-results-from-a-phase-3-randomized-placebo-controlled-active-reference-study/
2. Baraliakos X, Deodhar A, van der Heijde D et al. Bimekizumab maintains improvements in efficacy endpoints and has a consistent safety profile through 52 weeks in patients with non-radiographic axial spondyloarthritis and ankylosing spondylitis: results from two parallel Phase 3 studies. #L14 Presented at ACR Convergence 2022. https://acrabstracts.org/abstract/bimekizumab-maintains-improvements-in-efficacy-endpoints-and-has-a-consistent-safety-profile-through-52-weeks-in-patients-with-non-radiographic-axial-spondyloarthritis-and-ankylosing-spondylitis-resu/
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7. Hamilton L, Macgregor A, Toms A, et al. The prevalence of axial spondyloarthritis in the UK: a cross-sectional cohort study. BMC Musculoskelet Disord. 2015;21;16:392.
8. Glatt S, Helmer E, Haier B, et al. First-in-human randomized study of bimekizumab, a humanized monoclonal antibody and selective dual inhibitor of IL-17A and IL-17F, in mild psoriasis. Br J Clin Pharmacol. 2017;83(5):991-1001.
9. BIMZELX^® (bimekizumab) EU Summary of Product Characteristics. 
   https://www.ema.europa.eu/en/documents/product-information/bimzelx-epar-product-information_en.pdf. Last accessed: November 2022.
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