MPO and rheumatoid arthritis: Moreover, the levels of MPO‐DNA complexes and NE‐DNA complexes also showed increased in RA patients with ACPA‐SP, when compared to ACPA‐N (1.05 [0.50–1.53] vs 0.40 [0.38–0.98] and 1.10 [0.78–2.75] vs 0.50 [0.40–0.88], RU, p = 0.037 and p = 0.012, Figure 1C,D).