Adults with Moderate-to-Severe Plaque Psoriasis
Four multicenter, randomized, double-blind trials [PsO-1 (NCT02684370), PsO-2 (NCT02684357), PsO-3 (NCT02672852), and PsO-4 (NCT02694523)] enrolled 2,109 subjects 18 years of age and older with moderate-to-severe plaque psoriasis who had a body surface area (BSA) involvement of ≥10%, a static Physician’s Global Assessment (sPGA) score of ≥3 (“moderate”) in the overall assessment (plaque thickness/induration, erythema, and scaling) of psoriasis on a severity scale of 0 to 4, and a Psoriasis Area and Severity Index (PASI) score ≥12.
Overall, subjects had a median baseline PASI score of 17.8 and a median BSA of 20%. Baseline sPGA score was 4 (“severe”) in 19% of subjects. A total of 10% of trial subjects had a history of diagnosed psoriatic arthritis.
Across all trials, 38% of subjects had received prior phototherapy, 48% had received prior non-biologic systemic therapy, and 42% had received prior biologic therapy for the treatment of psoriasis.
Trials PsO-1 and PsO-2
In trials PsO-1 and PsO-2, 997 subjects were enrolled (including 598 subjects randomized to the SKYRIZI 150 mg group, 200 subjects randomized to the placebo group, and 199 to the biologic active control group). Subjects received treatment at Weeks 0, 4, and every 12 weeks thereafter.
Both trials assessed the responses at Week 16 compared with placebo for the two co-primary endpoints:
- the proportion of subjects who achieved an sPGA score of 0 (“clear”) or 1 (“almost clear”)
- the proportion of subjects who achieved at least a 90% reduction from baseline PASI (PASI 90)
Secondary endpoints included the proportion of subjects who achieved PASI 100, sPGA 0, and Psoriasis Symptom Scale (PSS) 0 at Week 16.
The results are presented in Table 8.
Table 8. Efficacy Results at Week 16 in Adults with Moderate-to-Severe Plaque Psoriasis in PsO-1 and PsO-2| | PsO-1 | PsO-2 |
| | SKYRIZI (N=304) n (%) | Placebo (N=102) n (%) | SKYRIZI (N=294) n (%) | Placebo (N=98) n (%) |
| sPGA 0 or 1 (“clear or almost clear”)a | 267 (88) | 8 (8) | 246 (84) | 5 (5) |
| PASI 90a | 229 (75) | 5 (5) | 220 (75) | 2 (2) |
| sPGA 0 (“clear”) | 112 (37) | 2 (2) | 150 (51) | 3 (3) |
| PASI 100 | 109 (36) | 0 (0) | 149 (51) | 2 (2) |
| a Co-primary endpoints |
Examination of age, gender, race, body weight, baseline PASI score and previous treatment with systemic or biologic agents did not identify differences in response to SKYRIZI among these subgroups at Week 16.
In PsO-1 and PsO-2 at Week 52, subjects receiving SKYRIZI achieved sPGA 0 (58% and 60%, respectively), PASI 90 (82% and 81%, respectively), and PASI 100 (56% and 60%, respectively).
Patient Reported Outcomes
Improvements in signs and symptoms related to pain, redness, itching and burning at Week 16 compared to placebo were observed in both trials as assessed by the PSS. In PsO-1 and PsO-2, about 30% of the subjects who received SKYRIZI achieved PSS 0 (“none”) at Week 16 compared to 1% of the subjects who received placebo.
Trial PsO-3
Trial PsO-3 enrolled 507 subjects (407 randomized to SKYRIZI 150 mg and 100 to placebo). Subjects received treatment at Weeks 0, 4, and every 12 weeks thereafter.
At Week 16, SKYRIZI was superior to placebo on the co-primary endpoints of sPGA 0 or 1 (84% SKYRIZI and 7% placebo) and PASI 90 (73% SKYRIZI and 2% placebo). The respective response rates for SKYRIZI and placebo at Week 16 were: sPGA 0 (46% SKYRIZI and 1% placebo); PASI 100 (47% SKYRIZI and 1% placebo); and PASI 75 (89% SKYRIZI and 8% placebo).
Maintenance and Durability of Response
In PsO-1 and PsO-2, among the subjects who received SKYRIZI and had PASI 100 at Week 16, 80% (206/258) of the subjects who continued on SKYRIZI had PASI 100 at Week 52. For PASI 90 responders at Week 16, 88% (398/450) of the subjects had PASI 90 at Week 52.
In PsO-3, subjects who were originally on SKYRIZI and had sPGA 0 or 1 at Week 28 were re-randomized to continue SKYRIZI every 12 weeks or withdrawal of therapy. At Week 52, 87% (97/111) of the subjects re-randomized to continue treatment with SKYRIZI had sPGA 0 or 1 compared to 61% (138/225) who were re-randomized to withdrawal of SKYRIZI.
Moderate-to-Severe Plaque Psoriasis of the Scalp or Genital Area (Trial PsO-5)
The efficacy of SKYRIZI was assessed in a multicenter, randomized, double-blind, placebo-controlled trial [PsO-5 (NCT05969223)] that enrolled subjects 18 years of age and older with moderate-to-severe plaque psoriasis of the scalp (Trial S), defined as Psoriasis Scalp Severity Index (PSSI) ≥12, scalp Investigator Global Assessment (scalp IGA) ≥3 (“moderate”), and ≥30% of the scalp affected, or moderate-to-severe plaque psoriasis of the genital area (Trial G), defined as static Physician’s Global Assessment of Genitalia (sPGA-G) ≥3 (“moderate”) at baseline. All subjects had BSA ≥1% and sPGA ≥3 (“moderate”) at baseline.
In trial PsO-5, subjects were randomized to receive either SKYRIZI 150 mg or placebo subcutaneously at Weeks 0 and 4. Starting at Week 16, all subjects received SKYRIZI 150 mg every 12 weeks until the last dose at Week 40.
Plaque Psoriasis of the Scalp
PsO-5 Trial S enrolled 105 subjects with moderate-to-severe plaque psoriasis of the scalp. The median age of enrolled subjects at baseline was 44 years (range 20 to 83 years) and 10% of the subjects were 65 years of age and older. Fifty-six (56)% of the subjects were male, 83% were White, 8% were Black or African American, and 5% were Asian; for ethnicity, 36% of the subjects identified as Hispanic or Latino. At baseline, 74% of the subjects had moderate plaque psoriasis of the scalp (scalp IGA of 3) and 26% had severe plaque psoriasis of the scalp (scalp IGA of 4). Median baseline PSSI was 32. Baseline BSA involvement was ≥10% for 62% of the subjects and <10% for the remaining subjects. Median baseline BSA involvement was 11%. Baseline sPGA score was 4 (“severe”) in 24% of the subjects.
At baseline, 54% of subjects were naïve to both non-biologic systemic and biologic therapy, 0% of subjects had received prior phototherapy, 15% had received prior non-biologic systemic therapy, and 37% had received prior biologic therapy.
The results are presented in Table 9.
Table 9. Efficacy Results at Week 16 in Adults with Moderate-to-Severe Psoriasis of the Scalp in PsO-5 Trial S| Endpoint | SKYRIZI (N=51) n (%) | Placebo (N=54) n (%) | Treatment Difference (95% CI) |
| scalp IGA of 0 or 1 (“clear or almost clear”)a | 31 (61) | 7 (13) | 47 (31, 63) |
| PSSI 90b | 27 (53) | 7 (13) | 40 (24, 55) |
| PSSI 100c | 23 (45) | 7 (13) | 31 (15, 47) |
a Primary endpoint
b Achievement of ≥90% improvement from baseline in PSSI
c Achievement of 100% improvement from baseline in PSSI |
Plaque Psoriasis of the Genital Area
PsO-5 Trial G enrolled 109 subjects with moderate-to-severe plaque psoriasis of the genital area. The median age of enrolled subjects at baseline was 45 years (range 19 to 77 years) and 15% of the subjects were 65 years of age and older. Sixty-five (65)% of the subjects were male, 90% were White, 4% were Asian, and 2% were Black or African American; for ethnicity, 29% of the subjects identified as Hispanic or Latino. At baseline, 62% of the subjects had moderate plaque psoriasis of the genital area (sPGA-G of 3) and 38% had severe or very severe plaque psoriasis of the genital area (sPGA-G of 4 or 5). Baseline BSA involvement was ≥10% for 63% of the subjects and <10% for the remaining subjects. Median baseline BSA involvement was 11%. Baseline sPGA score was 4 (“severe”) in 19% of the subjects.
At baseline, 61% of subjects were naïve to both non-biologic systemic and biologic therapy, 3% of subjects had received prior phototherapy, 17% had received prior non-biologic systemic therapy, and 26% had received prior biologic therapy.
The results are presented in Table 10.
Table 10. Efficacy Results at Week 16 in Adults with Moderate-to-Severe Psoriasis of the Genital Area in PsO-5 Trial G| Endpoint | SKYRIZI (N=55) n (%) | Placebo (N=54) n (%) | Treatment Difference (95% CI) |
| sPGA-G of 0 or 1 (“clear or minimal”)a | 38 (69) | 7 (13) | 57 (42, 72) |
| sPGA-G of 0 (“clear”) | 28 (51) | 3 (6) | 47 (33, 61) |
| GPI-NRS reduction of ≥4-point from baselineb | N=41 20 (49) | N=45 3 (7) | 43 (27, 59) |
| GenPs-SFQ item 2 score of 0 (never) or 1 (rarely)c,d | N=31 22 (71) | N=32 7 (22) | 46 (27, 66) |
a Primary endpoint
b Improvement of genital itch severity as measured by a reduction of at least 4 points in the 11-point Genital Psoriasis Itch (GPI) Numeric Rating Scale (NRS) from the Genital Psoriasis Symptom Scale (GPSS) among subjects with baseline score ≥4
c Genital Psoriasis Sexual Frequency Questionnaire (GenPs-SFQ) Item 2 (In the past week, how often did your genital psoriasis limit the frequency of your sexual activity?) score ranges from 0 to 4 (0 = never, 1 = rarely, 2 = sometimes, 3 = often, 4 = always); where higher scores indicate greater limitations on the frequency of sexual activity in the past week
d Among subjects with baseline score ≥2 |
Pediatric Subjects with Moderate-to-Severe Plaque Psoriasis
The safety and efficacy of SKYRIZI were assessed in a four-part trial [PsO-6 (NCT04435600)] [see Use in Specific Populations (
8.4
)
]. The trial included a randomized, efficacy assessor-blinded, active treatment-controlled cohort of 82 pediatric subjects 12 years of age and older with moderate-to-severe plaque psoriasis defined as BSA involvement of ≥10% with sPGA score of ≥3 or a PASI score ≥12.
Subjects were randomized 2:1 to receive SKYRIZI (N = 54) or ustekinumab (N = 28). Subjects weighing 40 kg or greater received SKYRIZI 150 mg and subjects weighing less than 40 kg received SKYRIZI 55 mg at Week 0, Week 4, and every 12 weeks thereafter.
Fifty-six (56)% of subjects were female, 83% were White, 10% were Asian, and 5% were Black or African American; for ethnicity, 17% of subjects identified as Hispanic or Latino. At baseline, 82% of subjects had a sPGA score of 3 (“moderate”) and 9% of subjects had a sPGA score of 4 (“severe”). Subjects had a median baseline PASI score of 15.7, and a median baseline BSA of 18%. A total of 4% of subjects had received prior biologic therapy.
The co-primary endpoints were sPGA score of 0 (“clear”) or 1 (“almost clear”) and at least a 2-point improvement from baseline, and PASI 75 at Week 16. The duration of treatment was up to 68 weeks.
The efficacy results are presented below (see Table 11).
Table 11. Efficacy Results at Week 16 in Pediatric Subjects 12 Years of Age and Older with Moderate-to-Severe Plaque Psoriasis in PsO-6 | SKYRIZI (N = 54) n (%) |
| sPGA 0 or 1 (“clear or almost clear”)a,b | 37 (69) |
| PASI 75a | 46 (85) |
| PASI 90 | 35 (65) |
| PASI 100 | 22 (41) |
| sPGA 0 (“clear”) | 22 (41) |
aco-primary endpoints band at least a 2-point improvement from baseline at Week 16 |
Maintenance of Response
Subjects originally treated with SKYRIZI who achieved sPGA of 0 or 1 at Week 16 were re-randomized to continue SKYRIZI every 12 weeks through Week 52 or were withdrawn from treatment. For subjects who were re-randomized and also had at least a 2-point improvement in sPGA from baseline at Week 16, 95% (18/19) of the subjects continuing SKYRIZI had sPGA of 0 or 1 and at least a 2-point improvement from baseline at Week 52 compared with 39% (7/18) for those withdrawn from SKYRIZI.