Conditions: Psoriasis
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 40
Healthy volunteers: no

Brief summary:
This double-blind, placebo-controlled study will be conducted at 5 study centers in the United States. Approximately 30 subjects with moderate to severe plaque-type psoriasis will take part. The study will consist of a screening period of up to 21 days, a 12-week treatment period with 7 on-treatment clinic visits (approximately one every 2 weeks) and a post-dosing follow-up clinic visit approximately 30 days after the last dose of study drug is taken.

Subjects will be randomized to receive either 250mg, 500mg or 1000mg of study drug or placebo. Study drug will be taken by mouth on a full stomach, every day for 84 days.

Vital signs, clinical laboratory results (hematology, chemistry, and urinalysis), ECGs and physical examinations will be assessed at periodic intervals from Day 1 through Day 84.

A skin biopsy will be taken at the beginning and the end of the dosing period to evaluate any effects of the study drug on psoriasis. Investigators will perform other psoriasis evaluations (including the Psoriasis Area and Severity Index \[PASI\] and the Physician's Global Assessment \[PGA\] at 5 different times throughout the study to quantify the effects of SRT2104 on psoriasis activity.

Subjects will complete questionnaires throughout the study, to document their sense of well-being and mood at 4 different times during the study.

Five blood samples will be obtained at different timepoints during the study, to measure the amount of SRT2104 in the body.

Detailed description:

Arms:
arm 1: 10 subjects will be randomized 4:1 (SRT2104: placebo) in each of 3 treatment arms (250mg, 500mg, or 1000mg).

Cohort 2 will commence after Cohort 1 has completed 28 consecutive days of dosing, followed by the completion of a safety review by an Independent Safety Review Committee.

Cohort 2 will be administered at approximately the same time every day, approximately 15 minutes following the consumption of food. Subjects must wait at least 1 hour after dosing before consuming additional calories. Dietary recommendations for the meal that precedes dosing will be provided to the study subjects by the clinical site staff. arm 2: 10 subjects will be randomized 4:1 (SRT2104: placebo) in each of 3 treatment arms (250mg, 500mg, or 1000mg).

Cohort 3 will commence after Cohort 2 has completed 28 consecutive days of dosing, followed by the completion of a safety review by an Independent Safety Review Committee.

Cohort 3 will be administered four SRT2104 capsules at approximately the same time every day, approximately 15 minutes following the consumption of food. Subjects must wait at least 1 hour after dosing before consuming additional calories. Dietary recommendations for the meal that precedes dosing will be provided to the study subjects by the clinical site staff. arm 3: 10 subjects will be randomized 4:1 (SRT2104: placebo) in each of 3 treatment arms (250mg, 500mg, or 1000mg).

Cohort 1 will be administered at approximately the same time every day, approximately 15 minutes following the consumption of food. Subjects must wait at least 1 hour after dosing before consuming additional calories. Dietary recommendations for the meal that precedes dosing will be provided to the study subjects by the clinical site staff.

Dosing for Cohort 2 will not commence until Cohort 1 has completed 28 consecutive days of dosing, followed by the completion of a safety review by an Independent Safety Review Committee.

Interventions: intervention 1: Placebo intervention 2: SRT2104
Intervention descriptions: intervention 1: For the placebo product, the SRT2104 drug substance will be replaced by microcrystalline cellulose (Avicel® PH 105) to match the SRT2104 investigational product. intervention 2: SRT2104 drug substance is a new chemical entity which is supplied as a fine, yellowish/amber powder. The SRT2104 investigational product is prepared by packing 250 mg of micronized SRT2104 powder with no additional additives into a size 00 opaque, hard gelatin capsule, packaged in dosing bottles containing a single daily dose.

Protocol document: