CALR and myositis disease: The cross‐sectional analyses of the 81 anti‐CRT Ab‐positive IIM patients revealed a weak positive correlation between the serum anti‐CRT Ab levels and the myositis disease activity assessment visual analogue scales (MYOACT) (Spearman’s r = 0.28, P = 0.009) and physician global assessment of disease activity (PGA) (Spearman’s r = 0.29, P = 0.008) (Figure 3a, b).