title: Efalizumab-induced thrombocytopenia: report of relapse after re-administration.
abstract: Although a reversible, sometimes severe, drug-induced thrombocytopenia is a recognized adverse drug reaction (ADR) in patients with psoriasis treated with efalizumab, definite proof for the association of thrombocytopenia with efalizumab is still lacking (currently level II evidence for ADR). We report a patient with psoriasis who had two episodes of reversible thrombocytopenia during efalizumab; the first occurred 5 months after introduction of the medication and the second 4 months after re-introduction of efalizumab for relapsing psoriasis. The development of a second episode of thrombocytopenia on re-exposure to efalizumab provides, for the first time in the literature to our knowledge, definite (level I) ADR evidence for efalizumab-induced thrombocytopenia.
authors.affiliation: Department of Skin and Venereal Diseases, University of Ioannina Medical School, Ioannina, Greece.
authors.forename: D
authors.initials: D
authors.lastname: Kiorpelidou
authors.forename: G
authors.initials: G
authors.lastname: Tsiouri
authors.forename: G
authors.initials: G
authors.lastname: Gaitanis
authors.forename: N
authors.initials: N
authors.lastname: Akritidis
authors.forename: I D
authors.initials: ID
authors.lastname: Bassukas
mesh_terms: D000911:Antibodies, Monoclonal / Q000009:adverse effects*; D061067:Antibodies, Monoclonal, Humanized; D003875:Drug Eruptions / Q000473:pathology*; D006801:Humans; D007166:Immunosuppressive Agents / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D011565:Psoriasis / Q000188:drug therapy*; D012008:Recurrence; D012720:Severity of Illness Index; D013921:Thrombocytopenia / Q000139:chemically induced / Q000473:pathology*; D016896:Treatment Outcome
chemical_list: D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D007166:Immunosuppressive Agents; C472181:efalizumab