A One-Year Study To Evaluate The Efficacy And Safety Of CP-690,550 For Patients With Moderate To Severe Chronic Plaque Psoriasis

Inclusion Criteria:

18 years or older with diagnosis for at least 12 months of moderate to severe plaque psoriasis covering at least 10% of body surface area
A Psoriasis Area and Severity Index (PASI) score of 12 or greater
Are considered to be candidates for systemic or light therapy
Have no evidence of active or latent tuberculosis

Exclusion Criteria:

Non-plaque or drug-induced forms of psoriasis
Cannot discontinue current oral, injectible or topical therapy for psoriasis or cannot discontinue phototherapy (PUVA or UVB)
Any uncontrolled significant medical condition