title: [Ankylosing spondylitis (Bechterew) and tissue antigen HLA-B 27. I. Diagnostic value of HLA-typing].
abstract: In 95 Swiss patients with classical ankylosing spondylitis (AS) the tissue antigen HLA-B27 was present in 92.6%, compared with 7.7% in healthy Swiss blood donors. Assuming the prevalence of ankylosing spondylitis in Switzerland to be 1.9 promille, the chance of a Swiss carrier of HLA-B27 to develop a classical form of AS would be only some 2.2%. For diagnostic purposes, HLA typing thus seems to be of very little value, as among the 462 000 Swiss carriers of HLA-B27 there seem to exist no more than 10 800 classical cases with clinically manifest AS. Absence of HLA-B 27 does not exclude ankylosing spondylitis, as 7.4% of the classical cases are HLA-B27-negative. However, the crudely calculated risk to develop AS is 160 times smaller compared to a carrier HLA-B27. Corner stone of the diagnosis therefore remains careful case history and radiological features of a bilateral sacroileitis of at least grade II.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D005787:Gene Frequency; D006680:HLA Antigens / Q000032:analysis*; D006650:Histocompatibility Testing; D006801:Humans; D008297:Male; D008875:Middle Aged; D013167:Spondylitis, Ankylosing / Q000175:diagnosis* / Q000235:genetics; D013557:Switzerland
chemical_list: D006680:HLA Antigens
vernacular_title: Spondylitis ankylosans (Bechterew) und Gewebsantigen HLA-B 27 I. Diagnostische Aussagekraft der HLA-Typisierung.