TNF and systemic lupus erythematosus: Compared to controls, TNF-α expression of NKT-like cells was lower in both inactive (76.4 ± 3.4% vs. 86.8 ± 1.7%, p = 0.017) and active (65.7 ± 5.4% vs. 86.8 ± 1.7%, p = 0.002) SLE patients.