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MHRA approves bimekizumab for psoriatic arthritis and axial spondyloarthritis

Bimekizumab is now approved for use by the UK’s Medicines and Healthcare products Regulatory Agency (MHRA) for the treatment of adults with active psoriatic arthritis (PsA) and active axial spondyloarthritis (axSpA), its manufacturer UCB has announced.

The MHRA approval of bimekizumab (brand name Bimzelx) makes the drug the first approved treatment both both conditions that works as a dual IL-17A and IL-17F inhibitor, both of which have ben implicated in driving the inflammatory processes associated with PsA and axSpA.

Bimekizumab can be used alone or in combination with methotrexate, for the treatment of adults with active PsA who have had an inadequate response or who have been intolerant to one or more disease-modifying anti-rheumatic drugs.

The AxSpA indication spans both non-radiographic axSpA (nr-axSpA) and ankylosing spondylitis (AS), also known as radiographic axSpA (r-axSpA).

For adults with nr-axSpA, bimekizumab can be used where there are objective signs of inflammation, as indicated by elevated C-reactive protein and/or magnetic resonance imaging, or for those who have responded inadequately or are intolerant to non-steroidal anti-inflammatory drugs. It can also be used for the treatment of adults with active r-axSpA who have responded inadequately or are intolerant to conventional therapy.

Claire Brading, managing director UK and Ireland at UCB, said: ‘The approval of Bimzelx in psoriatic arthritis and axial spondyloarthritis is a significant milestone for the rheumatology community in the UK.‘

She added: ‘We are extremely proud to be able to bring a new dual action biological treatment option to a broad range of people living with psoriatic arthritis and axial spondyloarthritis in the UK.‘

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Bimekizumab clinical efficacy

The MHRA approval for use in PsA was based on the findings of two randomised, double-blind, placebo-controlled phase 3 trials, BE OPTIMAL and BE COMPLETE. In both studies, bimekizumab met the primary endpoint of a 50% or greater improvement in American College of Rheumatology criteria (ACR50) at week 16 and all ranked secondary endpoints.

Consistent results were seen across both biologic-naive and TNF-inhibitor (TNFi) inadequate responder populations and the clinical responses achieved at Week 16 were sustained up to Week 52 in BE OPTIMAL.

In addition, among biological DMARD-naive and TNFi patients with an inadequate response, 47% and 59% of patients with baseline psoriasis affecting ≥ 3% body surface area receiving bimekizumab achieved a PASI100 at Week 16, respectively compared to only 2% and 5% receiving placebo.

The approval for axSpA was also based on the findings of two phase 3 trials, BE MOBILE 1 (nr-axSpA) and BE MOBILE 2 (AS). Bimekizumab met the primary endpoint of Assessment of SpondyloArthritis international Society ≥40% improvement response at Week 16 compared to placebo and all ranked secondary endpoints.

Indeed, the drug showed improvements compared to placebo in signs, symptoms and disease activity across the spectrum of disease.

Commenting on bimekizumab’s approval, Professor Karl Gaffney, rheumatologist at the Norfolk and Norwich University NHS Foundation Trust, said: ‘Psoriatic arthritis and axial spondyloarthritis are chronic, painful conditions with no cure. The unfortunate reality for many patients is that they will have to cycle through a number of treatments before eventually finding one that works for them.

‘I welcome the possibility of a new, dual-action, biologic treatment option to potentially improve the quality of life of people living with psoriatic arthritis and axial spondyloarthritis.‘

Earlier this year, bimekizumab was found to provide clinical benefit in patients with moderate to severe hidradenitis suppurativa.

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