- The patient has previously completed participation (i.e., completed per protocol, including any long term follow-up; or discontinued from the study due to withdrawal of consent, loss to follow-up, or other reason) in a Medimmune, Inc. study of MEDI-507 in psoriasis in which they received MEDI-507 (or placebo for patients who participated in a blinded placebo-controlled study of MEDI-507, and for whom the treatment assignment in that study has not been unblinded at the time of entry into this study)