C3 and lobular neoplasia: Among them, 4 parameters were effective to discriminate with good performances LN-A non-LN patients (0.7<AUC<0.89): anti-dsDNA Abs (AUC = 0.793; p < 10−4), followed by anti-C1q Abs (AUC = 0.753; p < 10−4), anti-Chromatin Abs (AUC = 0.733; p < 10−4), and the complement C3 fraction (AUC = 0.704; p < 10−4).