SPECTREM phase IIIb clinical trial results through week 16: guselkumab efficacy and safety for the treatment of low body surface area, moderate psoriasis with high-impact site involvement

Document Type

Article

Publication Date

1-6-2026

Publication Title

The British journal of dermatology

Keywords

Humans, Psoriasis, Male, Female, Middle Aged, Antibodies, Monoclonal, Humanized, Treatment Outcome, Double-Blind Method, Adult, Body Surface Area, Aged, Dermatologic Agents, Antibodies, Monoclonal, Severity of Illness Index

Abstract

BACKGROUND: Patients with psoriasis affecting a low percentage of their body surface area (BSA) are under-represented in clinical studies and may face substantial disease burden if high-impact sites are affected.

OBJECTIVES: To evaluate in a phase IIIb randomized placebo-controlled study (SPECTREM; NCT06039189) the efficacy and safety of guselkumab in participants with low BSA (2-15%), moderate [Investigator's Global Assessment (IGA) = 3] plaque psoriasis involving one or more high-impact site (scalp, face, genitals, intertriginous areas).

METHODS: Eligible participants were randomized 2 : 1 to receive guselkumab 100 mg or placebo at week 0 and week 4, then every 8 weeks. The primary endpoint was the proportion of participants achieving IGA 0/1 (cleared/minimal) at week 16. Major secondary endpoints included the proportion of participants achieving ≥ 90% improvement in Psoriasis Area and Severity Index (PASI 90), IGA 0 and 100% improvement in PASI (PASI 100); mean percentage improvements from baseline to week 16 in BSA and PASI; and proportions of participants achieving site-specific IGA or Physician's Global Assessment (PGA) 0/1 among those with scalp, facial, genital or intertriginous site-specific IGA/PGA ≥ 3 at baseline.

RESULTS: Among the 338 randomized participants (guselkumab, n = 225; placebo, n = 113), mean (SD) baseline BSA was 7.6% (3.7) and PASI was 9.0 (3.8). At week 16, all primary and major secondary endpoints were met, with guselkumab demonstrating superiority vs. placebo (all P < 0.001) in the proportions of participants achieving IGA 0/1 (74.2% vs. 12.4%), IGA 0 (40.4% vs. 3.5%), PASI 90 (52.9% vs. 6.2%) and PASI 100 (32.4% vs. 2.7%), and mean percentage improvement from baseline in BSA (80.6% vs. 6.1%) and PASI (82.6% vs. 13.7%). Site-specific IGA/PGA 0/1 response rates for guselkumab vs. placebo were as follows: scalp 75.0% (n = 114/152) vs. 14.5% (n = 11/76); face 87.8% (n = 79/90) vs. 28.6% (n = 12/42); genital 78.0% (n = 64/82) vs. 37.5% (n = 15/40) and intertriginous 86.5% (n = 96/111) vs. 28.8% (n = 15/52). In the guselkumab and placebo groups, respectively, 37.8% and 39.8% experienced one or more adverse event; no new safety signals were identified.

CONCLUSIONS: Through week 16, guselkumab was effective and well tolerated in participants with low BSA, moderate plaque psoriasis with involvement of high-impact sites. Statistically significant improvements across multiple clearance measures, irrespective of baseline BSA, support the effectiveness of guselkumab across a broad range of patients.

Medical Subject Headings

Humans; Psoriasis; Male; Female; Middle Aged; Antibodies, Monoclonal, Humanized; Treatment Outcome; Double-Blind Method; Adult; Body Surface Area; Aged; Dermatologic Agents; Antibodies, Monoclonal; Severity of Illness Index

PubMed ID

40875818

ePublication

ePub ahead of print

Volume

194

Issue

1

First Page

25

Last Page

36

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