The Safety, Efficacy and Pharmacokinetics of ARQ-151 Cream in Subjects With Chronic Plaque Psoriasis

The percentage of participants with an IGA score of 0 ('clear') or 1 ('almost clear') at Week 6 is reported. The IGA is 5-point scale assessing the severity of plaque psoriasis, with scores ranging from 0 ('clear') to 4 ('severe'), with higher scores indicating greater plaque severity.

The percentage of participants with an IGA score of 0 ('clear') or 1 ('almost clear') is reported. The IGA is 5-point scale assessing the severity of plaque psoriasis, with scores ranging from 0 ('clear') to 4 ('severe'), with higher scores indicating greater plaque severity.

The percent change from baseline in mPASI score is presented. The mPASI combines the assessment of the severity of lesions and the area affected into a single score ranging from 0 ('no disease') to 72 ('maximal disease'), with higher scores indicating greater severity. For scoring, the body is divided into four sections (head [h]: 10% of a person's skin; arms [a] 20%; trunk [t] 30%; legs (l] 40%); for each section, the percent of area involved is estimated from 0 (0% involved) to 6 (90 to 100% involved). Then, within each area, the severity is estimated by three clinical signs: erythema ('E'; redness), induration ('T'; thickness), and desquamation ('S'; scaling). Severity parameters are measured on a scale of 0 to 4, from none to maximum severity possible. Each of these areas is scored by itself, and then the four scores are combined into the final mPASI, using the formula mPASI = 0.1 (Eh + Th + Sh) Ah + 0.2 (Ea + Ta + Sa) Aa + 0.3 (Et + Tt + St) At + 0.4 (El + Tl + Sl) Al.

The BSA affected by psoriasis was determined by the subject's hand method, where the subject's hand (including fingers) surface area was assumed to equal 1% of BSA. The mean percent change from baseline in BSA is presented.

The percentage of participants with an IGA score of 0 ('clear') or 1 ('almost clear') plus a 2-grade improvement from baseline is reported. The IGA is 5-point scale assessing the severity of plaque psoriasis, with scores ranging from 0 ('clear') to 4 ('severe'), with higher scores indicating greater plaque severity.

The percentage of participants (who had intertriginous area involvement with an I-IGA score of at least mild at baseline) with at least a 2-grade improvement in I-IGA score at Weeks 4, 6, 8, and 12 is presented.

The WI-NRS is a simple, single-item scale to assess the subject-reported severity of this symptom, on a scale ranging from 0 ("no itch") to 10 ("worst imaginable itch") the subject experienced in the previous 24 hours. The mean (SD) change in WI-NRS score from baseline is presented.

The percentage of participants who had baseline WI-NRS scores ≥6 who achieved a 4-point reduction in WI-NRS score at Weeks 4, 6, 8, and 12 is reported. The WI-NRS is a simple, single item scale to assess the subject-reported severity of this symptom, on a scale ranging from 0 ("no itch") to 10 ("worst imaginable itch") the subject experienced in the previous 24 hours.

The percentage of subjects achieving a 75% reduction in mPASI (eg, mPASI-75) score relative to baseline is presented. The mPASI combines the assessment of the severity of lesions and the area affected into a single score ranging from 0 ('no disease') to 72 ('maximal disease'), with higher scores indicating greater severity.

The mPASI combines the assessment of the severity of lesions and the area affected into a single score ranging from 0 ('no disease') to 72 ('maximal disease'), with higher scores indicating greater severity. The percentage of subjects achieving a 90% reduction in mPASI (eg, mPASI-90) score relative to baseline is presented.

The PSD is a 16-item questionnaire asking subjects to rate the severity of psoriasis-related symptoms in the past 24 hours. Each question is scored from 0 ("no symptoms") to 11 ("worst imaginable symptoms"). Scores range from 0 to 176, with higher scores indicating greater symptom severity. The mean (SD) change in PSD total score relative to baseline is presented for each treatment arm.

The Itch-Related Sleep Loss NRS is a single item scale scored from 0 ("no itch-related sleep loss") to 10 ("itch-related sleep loss as bad as it could be") assessing the severity of itch-related sleep loss in the past 24 hours. The mean (SD) change from the baseline NRS score is presented for each treatment arm.

The DLQI is a 10-item scale asking subject to rate the severity of symptoms during the past week. Each item is scored from 0 ("not at all" or "not relevant") to 3 or 4 ("very much") [2 questions are scored 0 to 3 and 8 questions are scored 0 to 4]. The total DLQI score ranges from 0 to 48, with higher scores indicating greater symptom severity. The mean (SD) change from baseline DLQI score is presented.

Two items from the PSD asking participants to rate the overall severity of psoriasis-related itching and pain during the past 24 hours are presented. Each item is scored on an 11-point scale ranging from 0 ("no symptom") to 10 ("worst imaginable symptom"), with lower scores indicating lower symptoms severity. The mean (SD) score is presented for each treatment arm.