IL6R and ankylosing spondylitis: In addition, in another 34-year-old Japanese male AS patient treated with IL6R antagonists, the patient's Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) (37) and Bath Ankylosing Spondylitis Functional Index (BASFI) (38) decreased gradually from 3.3 to 0.4 and from 2.7 to 0.1, respectively.