IL15 and systemic lupus erythematosus: IL-15 enhanced the CD11b expression of NK cells from SLE patients (50.1 ± 2.9% versus 42.9 ± 3.1%, p = 0.012) but had no effect on CD11b expression of NK cells from controls (34.8 ± 4.9% versus 31.0 ± 5.0%, p = 0.055).