Long-term subcutaneous SPEVIGO ® (spesolimab-sbzo) treatment reduced flare frequency in patients with generalized pustular psoriasis (GPP), with nearly 75% experiencing no flares over three years. 1
Rapid flare control was observed, with 50% of patients achieving a GPPGA pustulation subscore of 0 at Week 1 with intravenous SPEVIGO. 2
LEO Pharma A/S, a global leader in medical dermatology, today announced new long-term results from EFFISAYIL® ON, an ongoing five-year open-label extension study of the pivotal EFFISAYIL 1 trial and the EFFISAYIL 2 trial, evaluating the efficacy, safety and tolerability of SPEVIGO® (spesolimab-sbzo) injection in patients with generalized pustular psoriasis (GPP). The findings are being shared at the 2026 American Academy of Dermatology (AAD) Annual Meeting.1,2
GPP is a systemic, neutrophilic inflammatory skin disease with a heterogeneous clinical course characterized by chronic symptoms and recurrent, unpredictable periods of acute flares.3,4
Preliminary results from the EFFISAYIL ON study demonstrated that long-term subcutaneous (SC) SPEVIGO treatment is effective in reducing the cumulative number of flares in patients with GPP. Long-term SPEVIGO SC treatment led to a reduction in the number of flares, from 2.0 flares per year reported before entering the EFFISAYIL program to a cumulative mean of 0.13 flares per year. Of the 118 patients who received three or more years of SPEVIGO SC treatment, 74.6% (n=88) experienced no flares during this period.1
“The long-term data from the EFFISAYIL ON study further strengthen the evidence base for SPEVIGO as an effective treatment for generalized pustular psoriasis, a rare, chronic, and often-overlooked disease,” said Shannon Schneider, Vice President of North America Medical Affairs for LEO Pharma. “LEO Pharma is committed to addressing the serious impact of GPP on people living with this condition, through continued data generation and clinical insights.”
For patients who experienced flares during the EFFISAYIL ON study, preliminary results showed that intravenous (IV) SPEVIGO is an effective and well tolerated treatment. Of the 131 patients enrolled in EFFISAYIL ON, 21 (16.0%) received SPEVIGO IV to treat a total of 36 flare events. A GPP Physician Global Assessment (GPPGA) pustulation subscore of 0 (clear) was observed in 50.0% (n=18) of flare treatments at Week 1 and 58.3% (n=21) at Week 2. A GPPGA total score of 0/1 (clear/almost clear) was observed in 41.7% (n=15) of flare treatments at Week 1 and 55.6% (n=20) at Week 2.2
Preliminary safety data remained consistent with the known safety profile of SPEVIGO. The percentage of patients reporting adverse events (AE) leading to treatment discontinuation in the SC arm was 4.2%. In the IV arm, serious AEs were 36.6% and AEs leading to treatment discontinuation was 4.6%.1,2
“Together these findings highlight the complementary roles of IV and SC SPEVIGO in the long-term management of GPP, supporting a treatment approach that helps address the full course of this chronic and unpredictable disease,” said Arash Mostaghimi, MD, MPH, FAAD, assistant professor of dermatology, Brigham & Women’s Hospital.
The SPEVIGO study presentations are part of LEO Pharma’s extensive data program at AAD, which includes 17 accepted abstracts across the company’s medical dermatology portfolio and pipeline.
The primary objective of this ongoing open-label, multicenter, 5-year long-term extension of the EFFISAYIL 1 and EFFISAYIL 2 trials is to assess the long-term safety and efficacy of SPEVIGO® (spesolimab-sbzo) treatment in patients with GPP. Subjects received SC SPEVIGO (300 mg every 4, 6, or 12 weeks; dose escalation and de-escalation for flare recurrence/resolution allowed per protocol) for up to 252 weeks. In case of a protocol-defined GPP flare, patients received IV SPEVIGO 900 mg (≤2 doses within 1 week). The primary outcome measure of the study was the occurrence of treatment-emergent adverse events (TEAEs) up to Week 252 of maintenance treatment. The secondary outcome measures the reoccurrence of a GPP flare (defined by the GPPGA), the time to first achievement of a GPPGA score of 0 or 1 in patients who received flare rescue treatment, a GPPGA pustulation sub-score of 0 indicating no visible pustules (by visit), and the change from baseline in Psoriasis Symptom Scale (PSS) score (by visit).1,2,5
Generalized pustular psoriasis (GPP) is a chronic, heterogeneous, neutrophilic inflammatory disease associated with skin and systemic symptoms that is distinct from plaque psoriasis. GPP is recognized as a separate clinical entity from other forms of psoriasis, with the IL-36 pathway being a key driver of GPP and triggering response to treatment.3,4 GPP can become life-threatening (mortality rates ranging from 2% to 16%) due to severe complications, such as multisystem organ failure and sepsis requiring urgent hospital care; many GPP patients also suffer from various comorbidities, which contribute to the ongoing burden for the patient and healthcare systems.6,7 GPP symptoms appear unpredictably and present on a continuum, which greatly impacts a patient’s quality of life, and may cause fear and anxiety over the disease course, as well as long-term impacts on quality of life related to work/school, emotional health, social activities and finances.7,8
SPEVIGO® (spesolimab-sbzo) is a humanized, selective antibody that specifically blocks the activation of the IL-36R, a signaling pathway within the immune system shown to be involved in the pathogenesis of several autoinflammatory diseases, including GPP.9 It is the first targeted therapy for the treatment of GPP and has been evaluated in the largest clinical program specifically for the treatment of patients with GPP.10-12References
Gudjonsson J, Navarini A, Langley R, et al. Long‑term (≥3‑year) efficacy of subcutaneous spesolimab treatment for prevention of flares in patients with generalized pustular psoriasis: results from the EFFISAYIL program. Presented at the 2026 AAD Conference, March 27–31, Denver, CO. Poster Presentation.
Gordon K, Navarini A, Choon SE, et al. Intravenous spesolimab for (re)treatment of generalized pustular psoriasis flares in patients receiving subcutaneous spesolimab: results from the 5‑year, open‑label EFFISAYIL ON extension study. Presented at the 2026 AAD Conference, March 27–31, Denver, CO. Poster Presentation.
Marrakchi S, Puig L. Pathophysiology of generalized pustular psoriasis. Am J Clin Dermatol. 2022;23:13–19.
Prinz JC, Choon SE, Griffiths CEM, et al. Prevalence, comorbidities and mortality of generalized pustular psoriasis: A literature review. J Eur Acad Dermatol Venereol . 2023;37:256–273.
ClinicalTrials.gov. National Library of Medicine (U.S.). Effisayil™ ON: A Study to Test Long-term Treatment With Spesolimab in People With Generalized Pustular Psoriasis Who Took Part in a Previous Study. Identifier: NCT03886246. Accessed March 2026.
Choon SE, Navarini AA, Pinter A. Clinical course and characteristics of generalized pustular psoriasis. Am J Clin Dermatol . 2022;23:21–29.
Gooderham MJ, Van Voorhees AS, Lebwohl MG. An update on generalized pustular psoriasis. Expert Rev Clin Immunol. 2019;15:907–919.
Reisner DV, Johnsson FD, Kotowsky N, et al. Impact of generalized pustular psoriasis from the perspective of people living with the condition: Results of an online survey. Am J Clin Dermatol. 2022;23:65–71.
SPEVIGO ® (spesolimab-sbzo). Prescribing Information. FDA. October 2025.
Morita A, Strober B, Burden AD, et al. Efficacy and safety of subcutaneous spesolimab for the prevention of generalised pustular psoriasis flares (Effisayil 2): an international, multicentre, randomised, placebo-controlled trial. Lancet. 2023;402:1541–1551.
Choon SE, Lebwohl MG, Marrakchi S, et al. Study protocol of the global Effisayil 1 Phase II, multicentre, randomised, double-blind, placebo-controlled trial of spesolimab in patients with generalized pustular psoriasis presenting with an acute flare. BMJ Open . 2021;11:e043666.
Bachelez H, Choon SE, Marrakchi S, et al. Trial of spesolimab for generalized pustular psoriasis. N Engl J Med . 2021;385:2431–2440.
MAT-93221 March 2026
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