Psoriasis is a chronic inflammatory skin disorder that is characterized by hyperproliferation of the keratinocytes and inflammation of the epidermal and dermal layers of the skin. This study, in patients with mild to moderate plaque psoriasis, is designed to further determine the efficacy, safety and tolerability of the novel, topically applied, non-steroid, anti-inflammatory WBI-1001 cream over a period of 12 weeks.