IL15 and systemic lupus erythematosus: α-GalCer + IL-15 further increase the percentage of NKT-like cells compared to IL-15 alone in SLE patients with active disease (16.4±2.2% vs 12.1±1.8%, p = 0.025), which was not observed in inactive SLE disease(9.1±1.6% vs 8.4±1.3%, p = 0.413) (Fig 2B).