CAST and ankylosing spondylitis: Rs27524-G (CAST/ERAP1 locus) was associated with “ankylosing spondylitis” (OR = 0.84, p = 5.4 × 10−7), “iridocyclitis” (OR = 0.88, p = 6.9 × 10−8) and “psoriasis” (OR = 0.85, p = 1.6 × 10−6).