IL21 and myositis disease: The incidence of myositis was associated with increased baseline levels of IL-1α [0 pg/mL, 95% CI: (0-8.75) vs. 0 pg/mL, 95% CI: (0-0), P = 0.00084], IL-21 [0 pg/mL, 95% CI: (0-195.4) vs. 0 pg/mL, 95% CI: (0-0), P = 0.044], LIF [21.39 pg/mL, 95% CI: (12.72-48.7) vs. 12.72 pg/mL, 95% CI: (10.51-14.33), P = 0.01], and PIGF-1 [88.76 pg/mL, 95% CI: (65.6-164.3) vs. 56.33 pg/mL, 95% CI: (46.8-77.37), P = 0.049] (Figure 2C, Supplementary Figure 1).