Low Baseline Interleukin-17A Levels Are Associated with Better Treatment Response at 12 Weeks to Tocilizumab Therapy in Rheumatoid Arthritis Patients

Figure 2

Bimodal distribution of IL-17A levels in the patients. Upper normal value of IL-17A level was defined as the mean serum IL-17A levels + 3SD in healthy controls (). IL-17A levels of RA patients were divided into the IL-17A low () and high () groups. Vertical line marks the cut-off value (i.e., upper normal value of IL-17A levels in the healthy controls). RA = rheumatoid arthritis; HC = healthy controls.