title: [Anti-beta-2-microglobulin antibodies in systemic lupus erythematosus].
abstract: The aim of this work was the study of 88 patients with SLE for clinical, laboratorial and demographical parameters. The patients sera were assayed for the presence of anti-beta-2-microglobulin antibodies by ELISA. These spectrofotometric results were converted in a standard-deviation unity in relation to the average of 29 control individuals values. It was established a cut-off of 2.5 standard-deviation in order to determine the limit of normality as well as the cut-off of 10 standard deviation was chosen in order to defined the higher values. Several statistical significant associations were observed between the anti-beta-2-microgobulin and the clinical and laboratorial parameters. The clinical applications of those associations were determined by the predictive value. It was only considered the values greater then 75%. The negative predictive values found in the lower cut-off were 92% to ANA (homogeneous-peripheral pattern), 89% to high levels CIC, 81% to mucocutaneous vasculitis and 80% to depressed CH50 levels. The positive predictive values found in 88% to high level of mucoprotein, 83% to mucocutaneous vasculitis, 83% to the onset-disease-time lower six years and 78% to limphopenia. Special attention may be paid to the high sensibility and specificity of the anti-beta-2-microglobulin test to some of the parameters in the evaluation of the disease activity, mainly in mucocutaneous vasculitis.
authors.affiliation: Disciplina de Reumatologia, Faculdade de Medicina, Universidade de São Paulo.
authors.forename: J de A
authors.initials: Jde A
authors.lastname: Kochen
authors.forename: M R
authors.initials: MR
authors.lastname: Nobre
authors.forename: R M
authors.initials: RM
authors.lastname: de Oliveira
authors.forename: N H
authors.initials: NH
authors.lastname: Yoshinari
mesh_terms: D000328:Adult; D000368:Aged; D001323:Autoantibodies / Q000097:blood*; D016009:Chi-Square Distribution; D005260:Female; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000097:blood* / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D014657:Vasculitis / Q000097:blood* / Q000276:immunology*; D001613:beta 2-Microglobulin / Q000276:immunology*
chemical_list: D001323:Autoantibodies; D001613:beta 2-Microglobulin