Study of 244 PsA &198 AS pts finds B27(+) in 25% PsA, 75% in AS. HLA‐B27 more likely to be younger, male, longer Dz duration, higher Xray scores. B27 was signif assoc w/ syndesmophyte symmetry, marginal syndesmophytes, but not sacroiliac symmetry. https://t.co/8MFVrTLWmF