PTX3 and lupus nephritis: Correlation analysis showed that there were significant correlations between urinary PTX3 levels and renal pathological activity indices scores (r = 0.460, P = 0.002), cellular crescents (r = 0.332, P = 0.034), interstitial inflammation (r = 0.349, P = 0.025), leukocyte infiltration (r = 0.311, P = 0.048), and tubular atrophy (r = 0.311, P = 0.048) in active lupus nephritis patients (Table 2).