MASP2 and systemic lupus erythematosus: Similarly, lupus patients with positive anti‐dsDNA (N = 15) revealed increased expression of MASP2 in serum than that in patients with negative anti‐dsDNA antibody (N = 46) (12 825.41 ± 1074.12 vs 12 036.54 ± 543pg/mL, P < .001).