Background/Purpose: To investigate the recurrence rate (RR) of ankylosing spondylitis (AS) over a lifespan, probands with clinically diagnosed AS and their first-degree relatives (FDRs) were studied in a Swiss cohort during 35 years of follow-up. Methods: In 1985 members of the Swiss AS Patient Society who had been diagnosed as having AS by their own … Continue reading Genetic Influences on Occurrence of Axial Spondyloarthritis (axSpA) in First-degree Relatives During a Prospective Study Lasting 35 Years