PLA2R1 and systemic lupus erythematosus: Moreover, anti-PLA2R Ab levels were significantly higher in PMN patients (134.85 [41.25–256.97] RU/ml) than in SLE patients (3.35 [2.3–4.35] RU/ml) and controls (2 [2–2.3]), p<0.0001 (Fig 1).