title: The association of human leukocyte antigen B27 with anterior uveitis in patients from the western region of Saudi Arabia: a retrospective study.
abstract: BACKGROUND
  The association of human leukocyte antigen B27 (HLA-B27) with anterior uveitis is well known. The prevalence of HLA-B27 and its relation to anterior uveitis is related to race and geographic location. The association is strongest in Western countries and weakest in Eastern countries. Data regarding this association from Middle Eastern countries are limited. Thus, we undertook the study reported here to evaluate the association of HLA-B27 with anterior uveitis in patients in a tertiary center in the western region of the Saudi Arabia.
  
  
  METHODS
  The study involved a retrospective analysis of the records of patients with anterior uveitis, referred to the uveitis clinic in Magrabi Eye and Ear Hospital, Jeddah, Saudi Arabia, from 1999 to 2010. The cost-effectiveness of HLA-B27 testing was analyzed.
  
  
  RESULTS
  Among the 587 cases of uveitis, 335 (57.1%; mean age 37.56±12.82 years; 203 male and 132 female) cases were of anterior uveitis. All patients with anterior uveitis were investigated for HLA-B27 positivity. Idiopathic anterior uveitis was the most common (80%), followed by Fuchs heterochromic cyclitis (7.45%) and ankylosing spondylitis (3.8%). Only two patients were HLA-B27 positive. The cost-effectiveness of HLA-B27 testing was found to be 165,000 Saudi riyals (44,594 US dollars) per positive case.
  
  
  CONCLUSIONS
  HLA-B27-related uveitis appears to be very rare in our part of the world. Idiopathic uveitis is the most common type of anterior uveitis. The cost-effectiveness of HLA-B27 testing is low for patients with anterior uveitis in the western region of Saudi Arabia.
authors.affiliation: Uveitis Services, Department of Ophthalmology, King Abdulaziz University, Jeddah, Saudi Arabia ; Magrabi Eye and Ear Hospital, Jeddah, Saudi Arabia.
authors.forename: Ahmed M
authors.initials: AM
authors.lastname: Bawazeer
authors.forename: Heba Ismail
authors.initials: HI
authors.lastname: Joharjy
keywords: Fuchs heterochromic cyclitis; HLA-B27; Saudi population; ankylosing spondylitis; cost-effectiveness; idiopathic anterior uveitis