Recurrence of axSpA in 1st-degree relatives (FDR) probands w/ 35-yrs F/U. From 363 AS probands & 806 FDR, 27.1% of B27(+) FDR developed axSpA; 18.2% from AS probands; 4% from nr-axSpA probands. Recurrence higher with B27+ probands https://t.co/1xczXdtrH3 https://t.co/mXZ72nVAqp