FCGR3B and systemic lupus erythematosus: When compared with the normal diploid 2 CN, low FCGR3B CN (≤1) was increased in frequency in SLE (OR 4.15, 95% CI: 1.82–9.46, P = 0.0003), while there was no association with high FCGR3B CN (≥3, P = 0.82) (Table 1).