C3 and lobular neoplasia: The results indicated that low C3 levels (OR, 4.005; 95%CI, 1.492-11.97; P = 0.0083), serum IgG levels (OR, 0.877; 95%CI, 0.807-0.947; P = 0.0012) and high HE4 levels (OR, 5.034; 95%CI, 1.81-16.58; P = 0.0036) were significantly associated with LN in patients with pSLE.