Ankylosing spondylitis without HLA B27.J Rheumatol Suppl. 1977; 3:54-6.JR
A series of 187 patients with definite ankylosing spondylitis was studied. Seventeen of these lacked the antigen HLA B27, but had signs and symptoms identical to the 170 HLA B27 positive patients. The study provides additional confirmation that other factors besides HLA B27 are involved in the development of ankylosing spondylitis.