IL15 and systemic lupus erythematosus: IL-15, when added to α-GalCer cultures could significantly decrease the percentages of early apoptotic iNKT cells in both control (6.9±0.9% vs 18.1±2.2%, p = 0.002) and SLE patients (8.3±1.1% vs 13.1±1.7%, p = 0.009).