title: Deficiency of the 9th component of complement (C9) in a patient with systemic lupus erythematosus.
abstract: We describe the first case of systemic lupus erythematosus (SLE) showing the 9th component of complement (C9) deficiency. In the serum of this patient, a low level of serum total hemolytic complement (CH50) and the absence of C9 was demonstrated. The patient's sister, with normal level of C9, was also found to have an autoimmune disorder.
authors.affiliation: First Department of Internal Medicine, Yokohama City University School of Medicine, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kawai
authors.forename: K
authors.initials: K
authors.lastname: Katoh
authors.forename: M
authors.initials: M
authors.lastname: Narita
authors.forename: K
authors.initials: K
authors.lastname: Tani
authors.forename: T
authors.initials: T
authors.lastname: Okubo
mesh_terms: D000328:Adult; D003186:Complement C9 / Q000172:deficiency*; D005260:Female; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000276:immunology*
chemical_list: D003186:Complement C9