UK generalised myasthenia gravis has no NICE-recommended novel agent — efgartigimod's June 2025 rejection (TA1069) leaves the 30-centre NHS neuromuscular network without a positive access decision.
Myasthenia gravis is an autoimmune disorder of the neuromuscular junction, most commonly driven by AChR antibodies (85% of generalised MG), with anti-MuSK and anti-LRP4 subtypes accounting for the remainder. An estimated 7,000–10,000 UK patients have generalised MG (gMG); diagnosis is confirmed via AChR-Ab testing at routine NHS immunology labs available at every NHS trust, with anti-MuSK and anti-LRP4 testing reserved for specialist neuromuscular labs. The NHS neuromuscular network comprises approximately 30 specialist centres coordinated through the Muscular Dystrophy UK (MDUK) network, and the Myasthenia Gravis Association UK (MGA) maintains a patient registry of roughly 3,000 enrolled members.
Eculizumab's own MG appraisal (TA636) was terminated in 2020 after the manufacturer chose not to submit a cost-effectiveness dossier, so NICE never modelled a cost-per-QALY figure for eculizumab in MG. Efgartigimod's appraisal (NICE technology appraisal GID-TA10986, project ID4003) concluded with final guidance TA1069, published 4 June 2025: NICE does not recommend efgartigimod for NHS use, citing gaps and uncertainties in the cost-effectiveness evidence. As a result, an estimated 4,000 UK moderate-to-severe gMG patients remain on the pyridostigmine plus corticosteroid/azathioprine/mycophenolate backbone, with IVIg or plasma exchange reserved for crises; patients who started efgartigimod on the NHS before June 2025 continue under transitional funding. MGA UK survey data estimate that 30–40% of UK gMG patients have inadequate disease control on current standard therapy, the population a future efgartigimod resubmission or new entrant would need to address.
UK gMG treatment landscape — the immunosuppressive backbone and the FcRn antagonist's NICE rejection
| Drug | Class | Company | MHRA/NICE Status | Key Evidence |
|---|---|---|---|---|
| Vyvgart (efgartigimod alfa) | FcRn antagonist, IV/SC | argenx | MHRA approved March 2023; NICE TA1069 not recommended, June 2025 — pre-guidance NHS starts continue | ADAPT trial: 68% MG-ADL responder |
| Mestinon + IST (pyridostigmine + azathioprine/MMF) | AChE inhibitor + immunosuppression | Generic | NHS formulary standard of care — no NICE-recommended novel-agent commissioning | 85%+ of UK gMG patients on this backbone |
Sources: NICE TA1069 (efgartigimod, June 2025); MGA UK survey 2023; NICE TA636 (eculizumab, terminated 2020); ADAPT trial evidence.
What this assessment answers
Every section answers a named commercial question your team is asking, scoped to your asset.
Delivers
- UK gMG population sizing by AChR/MuSK/LRP4 serological status
- inadequate-control segment sizing (MGA UK survey data)
- addressable population for FcRn antagonism following NICE TA1069
Delivers
- NHS serological testing algorithm (AChR-Ab, anti-MuSK, single-fibre EMG)
- CT thorax thymoma screening pathway
- thymectomy eligibility per MGTX trial evidence and NHS thoracic surgery capacity
Delivers
- NICE eculizumab MG appraisal termination context (TA636, 2020, no dossier submitted)
- efgartigimod TA1069 evidence base and committee rationale (ADAPT trial, rejected June 2025)
- cost-effectiveness positioning against the immunosuppressive backbone
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Commission This AssessmentWhat's inside
- Why AChR antibodies drive 85% of generalised MG cases, with anti-MuSK and anti-LRP4 accounting for the remainder
- How serological subtype determines the diagnostic testing pathway and treatment eligibility
- Sizing the 7,000-10,000 UK gMG population against the roughly 30-centre NHS neuromuscular network coordinated through MDUK
- How the Myasthenia Gravis Association UK patient registry of roughly 3,000 enrolled members supports population tracking
- The AChR-Ab, anti-MuSK, and single-fibre EMG testing algorithm from routine NHS labs to specialist neuromuscular labs
- CT thorax thymoma screening and thymectomy eligibility per MGTX trial evidence for AChR-positive patients
- The pyridostigmine-plus-corticosteroid/azathioprine/mycophenolate backbone that over 85% of UK gMG patients remain on
- Why 30-40% of UK gMG patients report inadequate disease control despite this standard therapy, per MGA UK survey data
- Why eculizumab's TA636 appraisal was terminated in 2020 without a submitted cost-effectiveness dossier
- How NICE's June 2025 TA1069 verdict on efgartigimod cited evidence gaps despite a 68% MG-ADL responder rate in ADAPT
- What pre-guidance NHS efgartigimod patients continuing under transitional funding signal for a future resubmission
- The addressable population and cost-effectiveness case a next entrant would need to build against the immunosuppressive backbone
Included with every brief
How AXLRx builds this assessment
Prepared by MoatRx analysts.
UK myasthenia gravis disease landscape is built from Myasthenia Gravis Association UK (MGA) survey and registry data, MDUK neuromuscular network centre mapping, and NICE appraisal documentation for both efgartigimod (TA1069, not recommended) and eculizumab (TA636, terminated) — the two data points that frame UK gMG's NICE cost-effectiveness precedent.
Key sources: MGA UK annual report 2023; MDUK neuromuscular network centre data; NICE MG guideline scope 2024; NHS MG management protocol (British Society of Immunology); NICE TA1069 (efgartigimod, June 2025); NICE TA636 (eculizumab, terminated 2020). All figures carry source citations and are triangulated across multiple primary sources.
- UK gMG population estimate verified against MGA UK annual report 2023
- NHS diagnostic pathway and thymectomy eligibility verified against NICE MG guideline scope 2024 and NHS MG management protocol (British Society of Immunology)
- Inadequate disease control rate (30–40%) verified against MGA UK survey 2023
- Eculizumab appraisal termination and efgartigimod NICE rejection verified against the published NICE TA636 (2020) and NICE TA1069 (June 2025) guidance documents
Frequently asked questions
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AXLRx Myasthenia Gravis Disease Landscape is built for commercial, medical affairs, and market access teams that need a rigorous, evidence-based characterisation of the UK gMG patient population and the NHS access pathway following efgartigimod's NICE rejection (TA1069). Custom assessment in 72 hours.
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