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Study of Guselkumab Versus Placebo for the Treatment of Low Body Surface Area Moderate Plaque Psoriasis

A Phase 3b, Multicenter, Randomized, Double-blind, Placebo-Controlled Study Evaluating the Safety and Efficacy of Guselkumab Versus Placebo for the Treatment of Low Body Surface Area (BSA) Moderate Plaque Psoriasis With Special Site Involvement

Status
Completed
Phases
Phase 3
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT06039189
Acronym
SPECTREM
Enrollment
338
Registered
2023-09-15
Start date
2023-08-24
Completion date
2025-04-14
Last updated
2026-05-01

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Moderate Plaque Psoriasis

Brief summary

The purpose of this study is to evaluate the efficacy of guselkumab compared to an inactive drug in participants with low body surface area moderate plaque psoriasis and special site involvement.

Interventions

DRUGGuselkumab

Guselkumab will be administered as subcutaneous injection.

DRUGPlacebo

Placebo will be administered as subcutaneous injection.

Sponsors

Janssen Research & Development, LLC
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
DOUBLE (Subject, Investigator)

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* All participants must have a diagnosis of plaque psoriasis (with or without psoriatic arthritis) for at least 6 months before first administration of study intervention * All participants must meet the following disease severity criteria at screening and at baseline: (a) Overall Investigator's Global Assessment (IGA) 3 (moderate) plaque psoriasis; (b) Body Surface Area (BSA) 2-15 percent (%) with at least 1 plaque outside of special sites; (c) Involvement of at least 1 special site with at least moderate severity. Qualifying sites include scalp with scalp-specific IGA greater than or equal to (\>=) 3, face with facial psoriasis IGA \>=3, intertriginous with intertriginous psoriasis IGA \>=3, or genital with static physician global assessment of genitalia (sPGA-G) \>=3 * All participants be inadequately controlled with or intolerant of at least 1 prior topical therapy (including, but not limited to, corticosteroids, retinoids, vitamin D, or vitamin D/steroid and retinoid/steroid combinations, tacrolimus, pimecrolimus, anthralin/dithranol, coal tar preparations, tapinarof, roflumilast, etcetera) for the treatment of psoriasis at both screening * All participants be a candidate for phototherapy or systemic treatment for psoriasis

Exclusion criteria

* Has a nonplaque form of psoriasis (example, erythrodermic, guttate, or pustular) at screening or randomization * Has current drug-induced psoriasis (for example, a new onset of psoriasis or an exacerbation of psoriasis from beta blockers, calcium channel blockers, or lithium) * For participants with palmoplantar involvement, confounding diagnoses, including, but not limited, to palmoplantar pustulosis, eczematous dermatitis, contact/irritant dermatitis, acquired keratoderma, etcetera, should be confirmed and excluded * Participants will not be eligible if they have ever received prior biologic (or biosimilars of) for the treatment of psoriasis, psoriatic arthritis (PsA), or any other indications that could impact the assessment of psoriasis. Prior biologics (or biosimilars of) may include, but not limited to, tumor necrosis factor (TNF)-inhibitors (for example: adalimumab, etanercept, infliximab, or certolizumab or biosimilars), interleukin (IL)-17 inhibitors (for example: secukinumab, ixekizumab, brodalumab, or bimekizumab), and IL-12/23 inhibitors (for example: ustekinumab), or IL-23 inhibitor (for example: guselkumab, risankizumab or tildrakizumab) * Has a history of chronic or recurrent infectious disease, including, but not limited to, chronic renal infection, chronic chest infection (for example, bronchiectasis), recurrent urinary tract infection (recurrent pyelonephritis or chronic non-remitting cystitis), fungal infection (mucocutaneous candidiasis), or open, draining, or infected skin wounds or ulcers

Design outcomes

Primary

MeasureTime frameDescription
Percentage of Participants Who Achieved an Investigator's Global Assessment (IGA) Score of Cleared (0) or Minimal (1) at Week 16Week 16The IGA assesses participant's plaque psoriasis. Lesions were graded for induration, erythema and scaling, each using a 5 point scale. Induration: 0 = no evidence of plaque elevation, 1 = minimal plaque elevation, = 0.25 millimeters (mm); 2 = mild plaque elevation, = 0.5 mm; 3 = moderate plaque elevation, = 0.75 mm; 4 = severe plaque elevation, greater than (\>) 1 mm; Erythema: 0 = no evidence of erythema, hyperpigmentation may be present, 1 = faint erythema, 2 = light red coloration, 3 = moderate red coloration, 4 = bright red coloration; Scaling: 0 = no evidence of scaling, 1 = minimal; occasional fine scale over less than 5% of the lesion, 2 = mild; fine scale dominates, 3 = moderate; coarse scale predominates, 4 = severe; thick, scale predominates. Final IGA score of psoriasis was based upon the average of induration, erythema and scaling scores assessed on a 5 point scale: cleared (0), minimal (1), mild (2), moderate (3), or severe (4). Higher score indicated more severe disease.

Secondary

MeasureTime frameDescription
Percent Change From Baseline in Body Surface Area (BSA) at Week 16Baseline (Week 0), Week 16Percent change from baseline in BSA at Week 16 was reported. A BSA was commonly used measure of severity of skin disease. It was defined as the percentage of surface area of the body involved with the condition being assessed, (that is, plaque psoriasis). BSA was assessed using hand print method where the surface area of the participant's hand including the palm and all 5 digits was used as a guide to estimate 1 percent (%) BSA. The baseline was defined as the closest measurement taken prior to or at the time of the first study drug administration date.
Percent Change From Baseline in Psoriasis Area Severity Index (PASI) Total Score at Week 16Baseline (Week 0), Week 16Percent change from baseline in PASI total score at Week 16 was reported. PASI was a system used for assessing and grading the severity of psoriatic lesions and their response to therapy. In the PASI system, the body was divided into 4 regions: the head, trunk, upper extremities, and lower extremities. Each of these areas were assessed and scored separately for erythema, induration, and scaling, which were each rated on a scale of 0 to 4 (0=none, 1 = slight, 2 = moderate, 3 = severe and 4 = very severe) and extent of involvement from 0 (indicated no involvement) to 6 (90% - 100% involvement). The PASI produced a numeric total score that could range from 0 (no psoriasis) to 72 (maximum psoriasis). Higher score indicated greater severity of psoriasis. The baseline was defined as the closest measurement taken prior to or at the time of the first study drug administration date.
Percentage of Participants Who Achieved IGA Score of Cleared (0) at Week 16Week 16The IGA assesses participant's plaque psoriasis. Lesions were graded for induration, erythema and scaling, each using a 5 point scale. Induration: 0 = no evidence of plaque elevation, 1 = minimal plaque elevation, = 0.25 mm; 2 = mild plaque elevation, = 0.5 mm; 3 = moderate plaque elevation, = 0.75 mm; 4 = severe plaque elevation, greater than (\>) 1 mm; Erythema: 0 = no evidence of erythema, hyperpigmentation may be present, 1 = faint erythema, 2 = light red coloration, 3 = moderate red coloration, 4 = bright red coloration; Scaling: 0 = no evidence of scaling, 1 = minimal; occasional fine scale over less than 5% of the lesion, 2 = mild; fine scale dominates, 3 = moderate; coarse scale predominates, 4 = severe; thick, scale predominates. Final IGA score of psoriasis was based upon the average of induration, erythema and scaling scores assessed on a 5 point scale: cleared (0), minimal (1), mild (2), moderate (3), or severe (4). Higher score indicated more severe disease.
Percentage of Participants Who Achieved PASI 90 Response at Week 16Week 16Percentage of participants who achieved PASI 90 score (greater than or equal to \[\>=\] 90% improvement from baseline in PASI) at Week 16 was reported. The PASI was a system used for assessing and grading the severity of psoriatic lesions and their response to therapy. In the PASI system, the body was divided into 4 regions: the head, trunk, upper extremities, and lower extremities. Each of these areas were assessed and scored separately for erythema, induration, and scaling, which were each rated on a scale of 0 to 4 (0 = none, 1 = slight, 2 = moderate, 3 = severe and 4 = very severe) and extent of involvement from 0 (indicated no involvement) to 6 (90% - 100% involvement). The PASI produced a numeric total score that could range from 0 (no psoriasis) to 72 (maximum psoriasis). Higher score indicated greater severity of psoriasis. The baseline was defined as the closest measurement taken prior to or at the time of the first study drug administration date.
Percentage of Participants Who Achieved PASI 100 Response at Week 16Week 16Percentage of participants who achieved PASI-100 score (100% improvement from baseline in PASI) at Week 16 was reported. The PASI was a system used for assessing and grading the severity of psoriatic lesions and their response to therapy. In the PASI system, the body was divided into 4 regions: the head, trunk, upper extremities, and lower extremities. Each of these areas was assessed and scored separately for erythema, induration, and scaling, which were each rated on a scale of 0 to 4 (0=none, 1 = slight, 2 = moderate, 3 = severe and 4 = very severe) and extent of involvement from 0 (indicated no involvement) to 6 (90% - 100% involvement). The PASI produced a numeric total score that could range from 0 (no psoriasis) to 72 (maximum psoriasis). Higher score indicated greater severity of psoriasis. The baseline was defined as the closest measurement taken prior to or at the time of the first study drug administration date.
Percentage of Participants Who Achieved Scalp Specific (ss)-IGA Score of Absence of Disease (0) or Very Mild Disease (1) at Week 16 Among Randomized Participants With Ss-IGA Score >=3 at BaselineWeek 16The ss-IGA instrument was used to evaluate the disease severity of scalp psoriasis. The lesions were assessed in terms of the clinical signs of redness, thickness, and scaliness which was scored as: absence of disease = 0, very mild disease = 1, mild disease = 2, moderate disease = 3, and severe disease = 4. A higher score indicated more severe disease. The baseline was defined as the closest measurement taken prior to or at the time of the first study drug administration date.
Percentage of Participants Who Achieved Static Physician's Global Assessment of Genitalia (sPGA-G) Score of 0 or 1 at Week 16 Among Randomized Participants With sPGA-G Score >=3 at BaselineWeek 16The sPGA-G was a 6-point scale to assess the severity of genital psoriasis at a given time point. The sPGA-G evaluates erythema, plaque elevation, and scale of genital psoriatic lesions. The severity of genital psoriasis was assessed as clear (0), minimal (1), mild (2), moderate (3), severe (4), and very severe (5). Higher score indicates more severity. The baseline was defined as the closest measurement taken prior to or at the time of the first study drug administration date.
Percentage of Participants Who Achieved Intertriginous IGA (i-IGA) Score of Clear (0) or Minimal (1) at Week 16 Among Randomized Participants With an i-IGA Score >=3 at BaselineWeek 16The IGA used for the full body assessment was adapted with descriptions of disease features that were more consistent with intertriginous psoriasis presentation. The intertriginous areas assessed included the axillary, sub mammary, abdominal fold, inguinal, and intergluteal cleft/peri-anal region (distinct from genital/perineum involvement). The i-IGA was 5-point scale evaluating the severity of plaque psoriasis in the intertriginous area with scores defined as clear (0), minimal (1), mild (2), moderate (3), and severe (4). A higher score indicated greater disease severity. The baseline was defined as the closest measurement taken prior to or at the time of the first study drug administration date.
Percentage of Participants Who Achieved Facial IGA (f-IGA) Score of Clear (0) or Minimal (1) at Week 16 Among Randomized Participants With f-IGA Score >=3 at BaselineWeek 16The standard IGA used for full body evaluation was adapted for assessment of psoriasis on the face only. The f-IGA used a 5-point scale to assess overall facial disease severity, defined as clear (0), minimal (1), mild (2), moderate (3), and severe (4). A higher score indicated more severe facial psoriasis. The baseline was defined as the closest measurement taken prior to or at the time of the first study drug administration date.
Change From Baseline in Psoriasis Symptom and Sign Diary (PSSD) Total Symptom Score at Week 16Baseline (Week 0), Week 16The PSSD was a patient reported outcome (PRO) questionnaire designed to measure the severity of psoriasis symptoms and signs for the assessment of treatment benefit. 7-day recall version was used. PSSD was a self-administered PRO instrument that included 11 items covering symptoms (itch, pain, stinging, burning and skin tightness) and participant observable signs (skin dryness, cracking, scaling, shedding or flaking, redness and bleeding) using 0 to 10 numerical rating scales for severity. Items were averaged on the weekly symptom score when at least 3 items (\>=50 percentage of 5 items) on these scales were answered. The average value was converted into 0-100 scoring, such that symptom score = average value\*10, where, 0= least severe and 100= most severe. Higher score indicated more severe disease. The baseline was defined as the closest measurement taken prior to or at the time of the first study drug administration date.
Percentage of Participants Who Achieved >=4-Point Improvement From Baseline in PSSD Itch Score at Week 16 Among Participants With a PSSD Itch Score >=4 at BaselineWeek 16PSSD was a PRO questionnaire designed to measure severity of psoriasis symptoms and signs for assessment of treatment benefit. 7-day recall version was used. PSSD was a self-administered PRO instrument that included 11 items covering symptoms(itch, pain, stinging, burning and skin tightness) and participant observable signs (skin dryness, cracking, scaling, shedding or flaking, redness and bleeding) using 0 to 10 numerical rating scales for severity. PSSD itch item score over seven days was averaged into a weekly itch score, ranging from 0 to 10 with higher scores indicating severe disease. Baseline was defined as the closest measurement taken prior to or at time of first study drug administration date.
Percentage of Participants Who Achieved PSSD Individual Symptom Scale Score=0 at Week 16 Among Participants With a PSSD Symptom Score >0 at BaselineWeek 16The PSSD was a PRO questionnaire designed to measure the severity of psoriasis symptoms and signs for the assessment of treatment benefit. 7-day recall version was used. PSSD was a self-administered PRO instrument that included 11 items covering symptoms (itch, pain, stinging, burning and skin tightness) and participant observable signs (skin dryness, cracking, scaling, shedding or flaking, redness and bleeding) using 0 to 10 numerical rating scales for severity. Items were averaged on the weekly symptom score when at least 3 items (\>=50 percentage of 5 items) on these scales are answered. The average value was converted into 0-100 scoring, such that symptom score = average value\*10, where, 0= least severe and 100= most severe. Higher score indicated more severe disease. The baseline was defined as the closest measurement taken prior to or at the time of the first study drug administration date.
Number of Participants With Treatment-Emergent Adverse Events (TEAEs)Group 1: Placebo: From Week 0 to Week 16; Group 1: Placebo followed by Guselkumab 100 mg: From Week 16 to Week 56; Group 2: Guselkumab 100 mg: From Week 0 to Week 56An adverse event (AE) was any untoward medical occurrence in a clinical study participant administered a pharmaceutical (investigational or non-investigational) product. An AE does not necessarily have a causal relationship with the intervention. TEAE was defined as any event that occurred after the start of initial study agent administration and those AEs that were presented at baseline but worsened in severity after the start of initial study agent administration.
Number of Participants With Treatment-Emergent Serious Adverse Events (TESAEs)Group 1: Placebo: From Week 0 to Week 16; Group 1: Placebo followed by Guselkumab 100 mg: From Week 16 to Week 56; Group 2: Guselkumab 100 mg: From Week 0 to Week 56An AE was any untoward medical occurrence in a clinical study participant administered a pharmaceutical (investigational or non-investigational) product. An AE does not necessarily have a causal relationship with the intervention. Serious adverse event (SAE) was any untoward medical occurrence at any dose that: resulted in death, was life threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in persistent or significant disability/incapacity, or resulted in congenital anomaly/birth defect. TEAE was defined as any event that occurred after the start of initial study agent administration and those AEs that were presented at baseline but worsened in severity after the start of initial study agent administration.

Countries

Canada, United States

Contacts

STUDY_DIRECTORJanssen Research & Development, LLC Clinical Trial

Janssen Research & Development, LLC

Baseline characteristics

Characteristic
Age, Categorical
<=18 years
0 Participants
Age, Categorical
>=65 years
46 Participants
Age, Categorical
Between 18 and 65 years
292 Participants
Age, Continuous46.2 Years
STANDARD_DEVIATION 14.83
Ethnicity (NIH/OMB)
Hispanic or Latino
32 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
193 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
0 Participants
Race/Ethnicity, Customized
American Indian or Alaska Native
5 Participants
Race/Ethnicity, Customized
Asian
23 Participants
Race/Ethnicity, Customized
Black or African American
13 Participants
Race/Ethnicity, Customized
More than one race
9 Participants
Race/Ethnicity, Customized
Native Hawaiian or Other Pacific Islander
2 Participants
Race/Ethnicity, Customized
Other
19 Participants
Race/Ethnicity, Customized
Unknown or Not Reported
0 Participants
Race/Ethnicity, Customized
White
249 Participants
Region of Enrollment
CANADA
67 Participants
Region of Enrollment
UNITED STATES
46 Participants
Sex: Female, Male
Female
56 Participants
Sex: Female, Male
Male
173 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
EG002
affected / at risk
deaths
Total, all-cause mortality
0 / 1130 / 1040 / 225
other
Total, other adverse events
12 / 11327 / 10450 / 225
serious
Total, serious adverse events
1 / 1132 / 10412 / 225

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: May 2, 2026