It was noted that there was no significant difference in efficacy measures assessing disease activity between the RI and its CT-P13, including the AS Disease Activity Score (ASDAS)-CRP level, Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), Bath Ankylosing Spondylitis Metrology Index (BASMI), and Bath Ankylosing Spondylitis Functional Index (BASFI) [6]. Here, CRP is linked to spondylitis.