SpA refers to a disease (ie, for which criteria have been developed) but also to a concept
that represents a group of interrelated disorders. Classically, these disorders comprise …

The term 'spondyloarthritides'(SpA) comprises ankylosing spondylitis (AS), reactive arthritis,
arthritis/spondylitis with inflammatory bowel disease, and arthritis/spondylitis with psoriasis …

Twenty-five years ago, HLA-B27 was recognized as a new HLA specificity. It is present
throughout Eurasia but is virtually absent among the genetically unmixed native populations …

This review focuses on various epidemiological aspects of ankylosing spondylitis (AS).
Diagnostic criteria currently available are described, and their use in scientific studies as …

Abstract Background Axial spondyloarthritis (AxSpA) is a relatively frequent and debilitating
disease, with a prevalence ranging from 0.1 to 2% in the Caucasian population. Current …

In the 25 years since the initial reports of the association of HLA-B27 with ankylosing
spondylitis (AS) and subsequently with Reiter's syndrome, psoriatic spondylitis, and the …

Objective. To investigate prevalence of HLA-B27 among general Arab populations and
among patients with ankylosing spondylitis (AS), and to review published data. Methods …

Ankylosing spondylitis (AS) is the prototype for spondyloarthritis primarily affecting young
men. Geographic and ethnic variations exist in the prevalence and severity of AS and relate …

The prevalence of HLA-B27 in the general population and in axial spondyloarthritis (axSpA)
patients in Saudi Arabia is unknown. The aim of this study was to evaluate the prevalence of …

Background and Objectives. The human leukocyte antigen HLA‐B27 is a class 1 antigen of
the major histocompatibility complex and is strongly associated with ankylosing spondylitis …