IL2 and acute lymphoblastic leukemia: At baseline, NK cells from ALL children in remission exhibited lower NKCA following IL-2 stimulation compared to controls (average 62% vs. 143%, respectively; P=0.001), and after exercise, NKCA increased in both groups but remained lower in ALL compared to controls, (average 80% vs. 155%, P=0.09, [Figure 2B]).