Inclusion Criteria:

• Subject was age 18 or older and in good health (Investigator discretion) with a recent stable medical history.
• Subject had a clinical diagnosis of psoriasis for at least 6 months, had moderate to severe plaque psoriasis.
• Subject was able and willing to self-administer sc injections or had available qualified person(s) to administer sc injections

Exclusion Criteria:

• Subject had previously received anti-TNF therapy.
• Subject cannot discontinue systemic therapies and/or topical therapies for the treatment of psoriasis and cannot avoid UVB or PUVA phototherapy
• Subject cannot avoid excessive sun exposure
• Subject is taking or requires oral or injectable corticosteroids
• Subject considered by the investigator, for any reason, to be an unsuitable candidate for the study
• Female subject who is pregnant or breast-feeding or considering becoming pregnant