ERAP1 and ankylosing spondylitis: Küçükşahin et al. [95] found that the mean bath ankylosing spondylitis disease activity index (BASDAI), BASFI, bath ankylosing spondylitis metrology index (BASMI), and ankylosing spondylitis disease activity score-C-reactive protein (ASDAS-CRP) values were greater among those with the ERAP1 rs26653 C/C SNP genotype than other patients; the differences were statistically significant.