Conditions: Psoriasis
Keywords: Double blind Dose-finding Vehicle-Controlled GSK2894512 Plaque Psoriasis
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 227
Healthy volunteers: no

Brief summary:
This study will evaluate the efficacy and safety of two concentrations (0.5 percent \[%\] and 1%) and two application frequencies (once a day and twice a day) of GSK2894512 cream for the topical treatment in subjects with plaque psoriasis. Results from this study will be considered when selecting the most appropriate concentration of GSK2894512 cream and dosing frequency in future clinical safety and efficacy studies. This is a multicenter (United States, Canada, and Japan), randomized, double-blind (sponsor-unblind), vehicle-controlled, 6-arm, parallel-group, dose-finding study. Two concentrations of GSK2894512 cream (0.5% and 1%) and a vehicle control cream will be equally randomized and evaluated following application to all psoriasis lesions (except on the scalp) once daily (evening) or twice daily (morning and evening) for 12 weeks. This study will consist of 3 periods: up to 4 weeks screening, 12 weeks double-blind treatment, and 4 weeks post-treatment follow-up. The total duration of subject participation will be approximately 16 to 20 weeks. Approximately 270 adult males and females subjects with plaque psoriasis will be screened in order to have at least 228 randomized subjects (38 subjects for each of the 6 treatment groups) and approximately 204 evaluable subjects overall. Approximately 30 subjects will be randomized in Japan to achieve at least 24 evaluable Japanese subjects.

Detailed description:

Arms:
arm 1: Subjects will apply a thin layer of GSK2894512 1% (10 milligram per gram \[mg/g\]) topical cream twice daily (morning and evening) for 12 weeks, to all psoriasis lesions (except on the scalp). arm 2: Subjects will apply a thin layer of GSK2894512 1% (10 mg/g) topical cream once daily (evening) for 12 weeks, to all psoriasis lesions (except on the scalp). arm 3: Subjects will apply a thin layer of GSK2894512 0.5% (5 mg/g) topical cream twice daily (morning and evening) for 12 weeks, to all psoriasis lesions (except on the scalp). arm 4: Subjects will apply a thin layer of GSK2894512 0.5% (5 mg/g) topical cream once daily (evening) for 12 weeks, to all psoriasis lesions (except on the scalp). arm 5: Subjects will apply a thin layer of vehicle topical cream twice daily (morning and evening) for 12 weeks, to all psoriasis lesions (except on the scalp). arm 6: Subjects will apply a thin layer of vehicle topical cream once daily (evening) for 12 weeks, to all psoriasis lesions (except on the scalp).

Interventions: intervention 1: GSK2894512 1% Cream intervention 2: GSK2894512 0.5% Cream intervention 3: Vehicle cream
Intervention descriptions: intervention 1: 1.0% (10 mg/g) GSK2894512 will be supplied as white to off-white cream to be applied topically intervention 2: 0.5% (5 mg/g) GSK2894512 will be supplied as white to off-white cream to be applied topically intervention 3: White to off-white vehicle cream base to be applied topically

Protocol document: